WO2005064743A1 - アンテナ装置及び通信機器 - Google Patents
アンテナ装置及び通信機器 Download PDFInfo
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- WO2005064743A1 WO2005064743A1 PCT/JP2004/019337 JP2004019337W WO2005064743A1 WO 2005064743 A1 WO2005064743 A1 WO 2005064743A1 JP 2004019337 W JP2004019337 W JP 2004019337W WO 2005064743 A1 WO2005064743 A1 WO 2005064743A1
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- Prior art keywords
- antenna device
- conductor pattern
- antenna
- loading
- conductor
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
- H01Q5/364—Creating multiple current paths
- H01Q5/371—Branching current paths
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Definitions
- the present invention relates to a wireless device for mobile communication such as a mobile phone, an antenna device used for a device such as a specified low-power wireless device, a weak wireless device, and a communication device including the antenna device.
- a monopole antenna in which a wire element having a length of 1/4 of the operating wavelength of an antenna is arranged on a ground plane is generally used.
- an inverted L-shaped antenna was developed in which the monopole antenna was bent halfway.
- the reactance part which is determined by the length of the horizontal part of the antenna element parallel to the ground plane, has a large value in terms of capacitance. Was difficult. Therefore, an inverted-F antenna was devised to facilitate matching between the antenna element and the 50 ⁇ feed line.
- This inverted F-type antenna has a stub that connects the ground plane and the radiating element near the feed point provided in the middle of the antenna element. It is easy to achieve matching with the feeder line (for example, see Non-Patent Document 1).
- a communication control circuit is provided inside a housing, and an antenna device is provided inside an antenna accommodating portion provided to protrude from the housing. Something has been done.
- multi-band compatible mobile phones have become widespread, and characteristics corresponding to a plurality of frequencies are also required for a built-in antenna device used therein.
- Commonly used are dual band mobile phones that support 900 MHz band GSM (Global System for Mobile Communication) and 1.8 GHz band DCS (Digital Cellular System) in Europe, and 800 MHz in the United States.
- Obi AMPS Advanced Mobile Phone Service
- 1.9GHz PCS Personal Communications Service
- a plate-shaped inverted-F antenna or a modified inverted-F antenna is often used as a built-in antenna device used for such a dual-band mobile phone.
- an antenna device has a wavelength formed by forming a slit on a radiating plate on a flat plate of a plate-shaped inverted-F antenna and separating the radiating plate into a first radiating plate and a second radiating plate.
- An antenna device configured to resonate at a frequency corresponding to approximately 1/4 of each path length has been proposed (for example, see Patent Document 1).
- a non-exciting electrode is placed near the inverted F antenna placed on the conductor plane to generate an odd mode and an even mode, so that resonance occurs at a frequency where the wavelength is 1/4 of each radiating conductor.
- An antenna device having such a configuration has been proposed (for example, see Patent Document 2).
- an antenna device has been proposed in which a linear first inverted-L antenna element and a second inverted-L antenna element are used to resonate at two different frequencies (for example, see Patent Literature). 3).
- the length of the radiation conductor is required to be about 1 / 8-3 / 8 of the resonance frequency.
- the constant value is a value determined by the type of antenna.
- Patent Document 1 Japanese Patent Laid-Open No. Hei 10-93332 (FIG. 2)
- Patent Document 2 JP-A-9-326632 (FIG. 2)
- Patent Document 3 JP-A-2002-185238 (FIG. 2)
- Non-Patent Document 1 Kyohei Fujimoto, “Illustrations: Mobile Communication Antenna System", Sogo Denshi Publishing, October 1996, p. 118—119
- Non-patent document 2 Hiroyuki Arai, “New Antenna Engineering”, Sogo Denshi Shuppan, September 1996, p. 108-109
- the length of the horizontal part of the antenna element parallel to the ground plane needs to be about 1/4 of the operating wavelength of the antenna.
- Radio and weak radios that use frequencies around 315 MHz require 17 Omm and 240 mm, respectively.
- the present invention has a problem that the size of the antenna device is increased when the antenna device is adapted to a low frequency band such as the 800 MHz band.
- the antenna device becomes large when it is adapted to a low frequency band such as the 800 MHz band.
- Equation 1 above indicates that when the antenna device having the same shape is miniaturized, the band of the antenna device is reduced and the radiation efficiency is reduced. Therefore, for example, in a 800 MHz band mobile phone in Japan, the FDD (Frequency Division Duplex) system that uses different frequency bands for transmission and reception makes it difficult to realize a small built-in antenna that covers the transmission and reception bands. It is.
- FDD Frequency Division Duplex
- the two loading elements are arranged in a straight line, when the antenna is housed in the antenna housing, the antenna protrudes inward of the housing, and the arrangement of the communication control circuit is limited.
- the space factor is bad.
- the present invention has been made in view of the above-described problem, and has as its object to provide an antenna device that can be downsized even in a band having a relatively low frequency, such as a 400 MHz band.
- Another object of the present invention is to provide a small antenna device having two resonance frequencies.
- Another object of the present invention is to provide a communication device having a small antenna device having two resonance frequencies and having a good space factor.
- the antenna device of the present invention includes a substrate, a conductive film provided on a part of the substrate, a feeding point provided on the substrate, and a body provided on the substrate and having a dielectric material force.
- a loading portion constituted by a linear conductor pattern formed in a longitudinal direction of the conductor pattern; An inductor portion connecting one end of the conductor pattern to the conductor film; and a feed point feeding power to a connection point between the one end of the conductor pattern and the inductor portion, wherein a longitudinal direction of the loading portion is the conductor portion. It is characterized in that it is arranged so as to be parallel to the edge of the film.
- the physical length of the antenna element parallel to the end of the conductor film is made larger than the antenna operating wavelength of 1Z4 by combining the loading section and the inductor section. Even if it is short, the electrical length can be 1Z4, which is the antenna operating wavelength. Therefore, the physical length can be greatly shortened, and the present invention is applied to a built-in antenna device of a practical wireless device even if the antenna device operates at a relatively low frequency such as a 400 MHz band. This becomes possible.
- a capacitor unit is connected between the connection point and the power supply unit.
- the capacitor unit that connects the feeding point and one end of the conductor pattern is provided, and the capacitance of the capacitor unit is set to a predetermined value, so that the impedance of the antenna device at the feeding point is reduced. It can be easily matched.
- the loading section is preferably provided with a lumped constant element.
- the electrical length is adjusted by the lumped constant element formed in the loading section. Therefore, the resonance frequency can be easily set without changing the length of the conductor pattern of the loading portion. Further, the impedance of the antenna device at the feeding point can be matched.
- a linear meandering pattern is connected to the other end of the conductor pattern.
- the linear meander pattern is connected to the conductor pattern, it is possible to increase the bandwidth and gain of the antenna section.
- the antenna device of the present invention has a capacitor portion formed of a pair of planar electrodes formed on the element body and facing each other.
- the loading portion and the capacitor portion are integrated by forming the pair of flat electrodes facing each other on the element body. This allows The number of parts of the tener device can be reduced.
- one of the pair of planar electrodes is provided on a surface of the element body so as to be trimmed.
- one of the pair of flat electrodes forming the capacitor portion is trimmed by, for example, irradiating a laser with one of the flat electrodes formed on the surface of the element body.
- the capacitance of the section can be adjusted. Therefore, the impedance of the antenna device at the feeding point can be easily matched.
- a multi-resonance capacitor portion is equivalently connected in parallel between two different points of the conductor pattern.
- a resonance circuit is formed by the conductor pattern between two points and the multiple resonance capacitor connected in parallel to the conductor pattern.
- the conductor pattern has a spiral shape wound in a longitudinal direction of the element body.
- the conductor pattern since the conductor pattern has a spiral shape, the length of the conductor pattern can be increased, and the gain of the antenna device can be increased.
- the conductor pattern has a meandering shape formed on a surface of the element body.
- the conductor pattern has a meandering shape.
- the length of the conductor pattern can be increased, and the gain of the antenna device can be improved. Further, the formation of the conductor pattern is facilitated by forming the conductor pattern on the surface of the element body.
- the antenna device of the present invention includes a substrate, a conductor film formed to extend in one direction on a surface of the substrate, and a dielectric or dielectric material disposed on the substrate at a distance from the conductor film.
- a first and second loading portions formed by forming a linear conductor pattern on a body made of a magnetic material or a composite material having both of them, and a portion between one end of the conductor pattern and the conductor film;
- a power supply section for supplying power to a connection point between one end of the conductor pattern and the inductor section, and a first resonance section provided by the first loading section, the inductor section, and the power supply section.
- a frequency is set, and a second resonance frequency is set in the second loading section, the inductor section, and the power supply section.
- the first loading section, the inductor section, and the feeding section form the first antenna section having the first resonance frequency
- the second loading section and the inductor form a second antenna unit having a second resonance frequency.
- the electrical length is the antenna operating wavelength. Satisfies 1/4. Therefore, even if the antenna device has two resonance frequencies, it is possible to greatly reduce the length of the antenna device.
- the electrical length of the first and second antenna sections is adjusted. Therefore, the first and second resonance frequencies can be easily set.
- the first and second loading units include a lumped element.
- the resonance frequency can be easily set without changing the length of the conductor pattern of the loading section.
- a linear meander pattern is connected to the other end of the conductor pattern.
- the linear meander pattern is connected to the conductor pattern, it is possible to achieve a wider band and a higher gain of the antenna unit.
- an extension member is connected to the other end of the conductor pattern.
- an extension member is connected to a tip of the meander pattern.
- an impedance adjustment unit is connected between the connection point and the power supply unit.
- the impedance in the power supply unit can be easily adjusted by the impedance adjustment unit.
- the conductor pattern has a spiral shape wound in a longitudinal direction of the element body.
- the conductor pattern since the conductor pattern has a spiral shape, the conductor pattern can be lengthened, and the gain of the antenna device can be increased.
- the conductor pattern has a meandering shape formed on a surface of the element body.
- the conductor pattern since the conductor pattern has a meandering shape, the length of the conductor pattern can be increased, and the gain of the antenna device can be improved. In addition, since the conductor pattern is formed on the surface of the element body, the formation of the conductor pattern becomes easy.
- a communication device includes a housing, a communication control circuit disposed in the housing, and an antenna device connected to the communication control circuit, wherein the housing includes a housing main body, An antenna accommodating portion provided to protrude outward from one side wall of the housing main body, wherein the antenna device is provided with a first substrate portion extending in one direction and a first substrate portion extending from the first substrate portion.
- a substantially L-shaped substrate having a second substrate portion bent and extending to the side of the first substrate portion; a ground connection portion disposed on the substrate and connected to a ground of the communication control circuit;
- a first loading portion formed on the first substrate portion and formed by forming a linear conductor pattern on a body made of a composite material having a dielectric or a magnetic material or both, and And a dielectric or magnetic material or both From the composite material
- a second loading section formed by forming a linear conductor pattern on the element body; an inductor section connecting one end of the first and second loading sections to the ground connection section; and a communication control circuit.
- a power supply unit for supplying power to a connection point between one end of the first and second loading units and the inductor unit, and the first substrate unit or the second substrate unit provided with the first loading unit.
- Either one of the second substrate portions provided with the loading portion is disposed in the antenna storage portion, and the other is placed along the inner surface of the one side wall so as to be positioned.
- the first antenna device having the first resonance frequency is formed by the first loading unit, the inductor unit, and the power supply unit
- the second antenna unit includes the second loading unit, the inductor unit, and the power supply unit.
- a second antenna device having a second resonance frequency is formed.
- one of the two loading sections is housed in the antenna housing section, and the other is arranged along the inner surface of one side wall of the housing body, so that the position of the communication control circuit is not restricted. Good space factor.
- the loading portion disposed inside the antenna housing is disposed so as to protrude outward from the housing, the transmission / reception characteristics of the antenna device including the loading portion are improved. Can be.
- the antenna device includes a lumped constant element provided in one or both of the first and second loading units.
- the resonance frequency can be easily set by adjusting the electrical length without changing the length of the conductor pattern of the loading portion by using the lumped constant element formed in the loading portion.
- the impedance of the antenna device at the feeding point can be matched.
- the antenna device may be configured such that the connection point and the power supply unit are connected to each other. It is preferable to have an impedance adjustment unit connected between them.
- the impedance in the power supply unit can be matched by the impedance adjustment unit. Therefore, signal transmission can be performed efficiently without separately providing a matching circuit for matching the impedance between the antenna device and the communication control circuit.
- the conductor pattern has a spiral shape wound in a longitudinal direction of the element body.
- the conductor pattern in a spiral shape, it is possible to increase the length S of the conductor pattern, thereby increasing the gain of the antenna device.
- the conductor pattern preferably has a meandering shape formed on a surface of the element body.
- the conductor pattern since the conductor pattern has a meandering shape, the conductor pattern length can be increased as described above, and the gain of the antenna device can be increased. Further, since the conductor pattern is formed on the surface of the element body, the formation of the conductor pattern is facilitated.
- FIG. 1 is a plan view showing the antenna device according to the first embodiment of the present invention.
- FIG. 2 is a perspective view showing the antenna device according to the first embodiment of the present invention.
- FIG. 3 is a graph showing a VSWR frequency characteristic of the antenna device according to the first embodiment of the present invention.
- FIG. 4 is a graph showing a radiation pattern of the antenna device according to the first embodiment of the present invention.
- FIG. 5 is a perspective view showing an antenna device according to a second embodiment of the present invention.
- FIG. 6 is a perspective view showing an antenna device according to a third embodiment of the present invention.
- FIG. 7 is a perspective view showing an antenna device according to a fourth embodiment of the present invention.
- FIG. 8 is a perspective view showing another form of the antenna device according to the fourth embodiment of the present invention.
- FIG. 9 is a perspective view showing another form of the antenna device according to the fifth embodiment of the present invention.
- Garden 10 is a perspective view showing an antenna device according to a sixth embodiment of the present invention.
- Garden 11] is an equivalent circuit diagram showing the antenna device according to the sixth embodiment of the present invention.
- Garden 12] is a graph showing the VSWR frequency characteristics of the antenna device according to the sixth embodiment of the present invention.
- Garden 13 is a perspective view showing an antenna device other than the sixth embodiment of the present invention, to which the present invention can be applied.
- Garden 14 is a perspective view showing an antenna device according to a seventh embodiment of the present invention.
- Garden 15 is an equivalent circuit diagram showing the antenna device according to the seventh embodiment of the present invention.
- Garden 16 is a graph showing the VSWR frequency characteristics of the antenna device according to the seventh embodiment of the present invention.
- Garden 17 is a perspective view showing an antenna device according to an eighth embodiment of the present invention.
- Garden 18] is an equivalent circuit diagram showing the antenna device according to the eighth embodiment of the present invention.
- Garden 19] is a graph showing the VSWR frequency characteristics of the antenna device according to the eighth embodiment of the present invention.
- FIG. 22 is a perspective view of a first loading element
- FIG. 22B is a perspective view of a second loading element in FIG.
- FIG. 23 is a schematic view showing the antenna device in FIG.
- FIG. 24 is a graph showing VSWR characteristics of the antenna device in FIG.
- Garden 25 is a plan view schematically showing an external antenna to which the present invention can be applied, other than the ninth embodiment of the present invention.
- End. 26 is a schematic diagram of an antenna device according to a tenth embodiment of the present invention.
- [En] is a perspective view showing the antenna device according to the eleventh embodiment of the present invention.
- FIG. 29 is a schematic diagram of the antenna device in FIG. 28.
- FIG. 30 is a graph showing VSWR characteristics of the antenna device of FIG.
- FIG. 31 is a graph showing the directivity of the antenna device of FIG. 28.
- FIG. 32 is an external perspective view showing a mobile phone according to a twelfth embodiment of the present invention.
- FIG. 33 is a cross-sectional view showing a part of the first housing in FIG. 32.
- FIG. 34 is a plan view showing the antenna device of FIG.
- FIG. 35 shows the loading element of FIG. 34, (a) is a perspective view of a first loading element, and (b) is a perspective view of a second loading element.
- FIG. 36 is a schematic view showing the antenna device of FIG. 34.
- FIG. 37 shows a loading section in Embodiment 1 of the present invention, (a) is a plan view, and (b) is a front view.
- FIG. 38 shows a loading portion in Embodiment 2 of the present invention, (a) is a plan view, and (b) is a front view.
- FIG. 39 is a graph showing the VSWR frequency characteristics of the antenna device according to the first embodiment of the present invention.
- FIG. 40 is a graph showing the frequency characteristics of the VSWR of the antenna device according to the second embodiment of the present invention.
- FIG. 41 shows frequency characteristics of VSWR of the antenna device of the present invention, (a) is a graph of the antenna device in Example 3, and (b) is a graph of the antenna device in the comparative example.
- FIG. 42 shows radiation patterns of vertically polarized waves of the antenna device of the present invention, (a) is a graph of the antenna device in Example 3, and (b) is a graph of the antenna device in the comparative example.
- FIG. 43 is a graph showing the relationship between the frequency and the VSWR of the mobile phone according to the present invention in the fourth embodiment.
- FIG. 44 is a graph showing the directivity of the radiation pattern of the mobile phone of the present invention in the fourth embodiment.
- FIG. 45 is a plan view showing an antenna device according to another embodiment of the present invention.
- the antenna device 1 is, for example, an antenna device used for a mobile communication wireless device such as a mobile phone and a wireless device such as a specified low-power wireless communication and a weak wireless communication.
- the antenna device 1 includes a substrate 2 made of an insulating material such as resin, an earth portion 3 which is a rectangular conductive film provided on the surface of the substrate 2, and a substrate 2, a loading section 4, an inductor section 5, a capacitor section 6, and a feeding point P connected to a high-frequency circuit (not shown) provided outside the antenna device 1.
- a high-frequency circuit not shown
- the loading section 4 is formed of a conductor pattern 12 formed in a spiral shape in the longitudinal direction of the surface of a rectangular parallelepiped element 11 made of a dielectric material such as alumina.
- Both ends of the conductor pattern 12 are connected to connection electrodes 14A and 14B provided on the back surface of the element body 11 so as to be electrically connected to rectangular installation conductors 13A and 13B provided on the surface of the substrate 2. ing.
- One end of the conductor pattern 12 is electrically connected to the inductor section 5 and the capacitor section 6 via the installation conductor 13B, and the other end is an open end.
- the loading portion 4 is spaced apart such that L1 which is the distance from the end 3A of the ground portion 3 is, for example, 10 mm, and the length L2 of the loading portion 4 in the longitudinal direction is, for example, It is 16mm.
- the self-resonant frequency of the loading unit 4 is higher than the antenna operating frequency of 430 MHz. For this reason, when the antenna operating frequency of the antenna device 1 is considered as a reference, it cannot be said that the antenna device 1 is self-resonating.
- the inductor section 5 has a chip inductor 21, and is connected to the installation conductor 13 B via an L-shaped pattern 22 which is a linear conductive pattern provided on the surface of the substrate 2. It is configured to be connected to the ground unit 3 via a ground connection pattern 23 which is a linear conductive pattern provided on the surface of the substrate 2.
- the inductance of the chip inductor 21 is adjusted so that the resonance frequency of the loading section 4 and the inductor section 5 becomes 430 MHz, which is the antenna operating frequency of the antenna device 1.
- the L-shaped pattern 22 is formed so that the side 22A is parallel to the ground portion 3, and has a length L3 of 2.5 mm. As a result, the physical length L4 of the antenna element parallel to the end 3A of the grounding portion 3 becomes 18.5 mm.
- the capacitor section 6 has a chip capacitor 31 and has a line provided on the surface of the substrate 2. Is connected to the installation conductor 13B via the installation conductor connection pattern 32, which is a conductive pattern, and is also supplied via the power supply point connection pattern 33, which is a linear conductive pattern similarly provided on the surface of the substrate 2. It is configured to connect to point P.
- the capacitance of the chip capacitor 31 is adjusted and adjusted so as to match the impedance at the feeding point P.
- FIG. 3 shows the frequency characteristics of VSWR (voltage standing wave ratio) at frequencies of 400 to 450 MHz and the radiation patterns of horizontal and vertical polarizations of the antenna device 1 configured as described above. See Figure 4.
- VSWR voltage standing wave ratio
- the high-frequency signal having the antenna operating frequency transmitted from the high-frequency circuit to the feeding point P is transmitted from the conductor pattern 12 as a radio wave. Further, a radio wave having a frequency that matches the antenna operating frequency is received by the conductor pattern 12 and transmitted from the feeding point P to the high-frequency circuit as a high-frequency signal. At this time, radio waves are transmitted and received in a state in which power loss is reduced by the capacitor unit 6 having a capacitance such that the input impedance of the antenna device 1 and the impedance at the feeding point P can be matched.
- the antenna device 1 configured as described above has a physical length of 5 mm of the antenna element parallel to the end 3 A of the ground portion 3 by combining the loading portion 4 and the inductor portion 5. Since the electrical length is 1/4 wavelength, the size can be significantly reduced to about 1/10 of about 170mm which is 1/4 wavelength of 430MHz electromagnetic wave. Thus, the present invention can be applied to a built-in antenna device of a practical wireless device even in a relatively low frequency band such as a 400 MHz band.
- the conductor pattern 12 has a spiral shape wound in the longitudinal direction of the element body 11, the conductor pattern 12 can be lengthened, and the gain of the antenna device 1 can be improved. It becomes possible.
- the impedance at the feeding point P can be matched by the capacitor section 6. This eliminates the need to provide a matching circuit between the feeding point P and the high-frequency circuit, thereby suppressing a reduction in radiation gain due to the matching circuit and efficiently transmitting and receiving radio waves.
- a chip inductor 42 is provided as a lumped constant element between the installation conductor 13B and the inductor section 5 while being connected to the feeding point P by a feeding point connection pattern 41.
- the loading section 43 includes the installation conductor 13B, the feeding point connection pattern 41 that connects the connection point of the loading section 43 and the inductor section 5 to the feeding point P, and the conductor pattern 13 and the inductor section 5. It has a connection conductor 44 to be connected and a chip inductor 42 provided on the connection conductor 44.
- the physical length can be significantly reduced by combining the loading unit 43 and the inductor unit 5 as in the first embodiment described above. Can be.
- the resonance frequency can be easily set without adjusting the length of the conductor pattern 12, and the impedance matching at the feeding point P can be achieved. Therefore, a decrease in radiation gain due to the matching circuit is suppressed, and radio waves are transmitted and received efficiently.
- an inductor is used as the lumped constant element.
- the present invention is not limited to this, and a capacitor in which an inductor and a capacitor are connected in parallel or in series may be used.
- the same reference numerals are given to the components described in the above embodiment, and the description will be omitted.
- the difference between the third embodiment and the first embodiment is that, in the antenna device 1 according to the first embodiment, the spiral pattern in which the conductor pattern 12 of the loading portion 4 is wound in the longitudinal direction of the element body 11.
- the antenna device 50 according to the third embodiment is characterized in that the conductor pattern 52 of the loading portion 51 has a meandering shape formed on the surface of the element body 11.
- a conductor pattern 52 having a meandering shape is formed on the surface of the element body 11, and both ends of the conductor pattern 52 are connected to the connection electrodes 14A and 14B, respectively.
- the antenna device 50 configured as described above has the same operation and effect as the antenna device 1 in the first embodiment, but has a meander shape by forming a conductor on the surface of the element body 11. Since the loading unit 51 is configured, it is possible to easily manufacture the loading unit 51.
- the capacitor section 6 has a chip capacitor 31, and the chip capacitor 31 provides Although the impedance of the antenna device 1 is matched, the antenna device 60 according to the fourth embodiment has the first and second planar electrodes, which are a pair of planar electrodes opposed to each other with the capacitor portion 61 formed on the element body 11. It has a capacitor portion 64 formed by 62 and 63, and the impedance of the antenna device 60 at the feeding point P is matched by the capacitor portion 64.
- the conductor pattern 12 having a spiral shape is formed on the surface of the element body 11, and the first planar electrode formed on the surface of the element body 11 and electrically connected to one end of the conductor pattern 12 62 and a second plane electrode 63 disposed inside the element body 11 so as to face the first plane electrode 62.
- the first plane electrode 62 is configured to be trimmed by, for example, forming a gap G by irradiating a laser, whereby the capacitance of the capacitor unit 64 can be changed.
- the first planar electrode 62 is connected to a connection electrode 66A provided on the back surface of the element body 11 so as to be electrically connected to the rectangular installation conductors 13A, 65A, 65B provided on the surface of the substrate 2. ing.
- the second plane electrode 63 is connected to the connection electrode 65B provided on the back surface of the element body 11 so as to be electrically connected to the installation conductor 65B.
- the installation conductor 65B is electrically connected to the feeding point P via the feeding point connection pattern 33.
- the inductor portion 67 is connected to the installation conductor 65B via the L-shaped pattern 22 which is a linear conductive pattern provided on the surface of the substrate 2 with the chip inductor 21.
- the antenna device 60 thus configured has the same operation and effect as the antenna device 1 in the first embodiment, but the first and second planar electrodes 62 and 63 facing each other to the element body 11.
- the loading section 4 and the capacitor section 64 are integrated. Therefore, the number of parts of the antenna device 60 can be reduced.
- the capacitance of the capacitor section 64 can be changed, so that the impedance at the feeding point P can be easily matched. .
- the conductor pattern 12 has a spiral shape wound in the longitudinal direction of the element body 11, but as shown in FIG.
- the antenna device 70 in which the conductor pattern 52 has a meandering shape as in the present embodiment may be used.
- a meander pattern 71 having a meander shape is formed on the surface of the substrate 2 so as to be connected to the land 13A of the loading section 4.
- the meander pattern 71 is arranged such that its major axis is parallel to the conductor film 3.
- the antenna device 70 configured as described above has the same operation and effect as the antenna device 40 in the second embodiment, but the meander pattern 71 is connected to the tip of the loading section 4. , The bandwidth of the antenna device and the gain can be increased.
- the conductor pattern 12 has a spiral shape wound in the longitudinal direction of the element body 11, but similar to the third embodiment, the conductor pattern 12 has a spiral shape. It may be under-shaped.
- a multi-resonant capacitor unit 81 is connected in parallel to both ends of the conductor pattern 12. is there.
- the multiple resonance capacitor portion 81 includes flat conductors 83A and 83B formed on both upper and lower surfaces of the element body 82A, and linear conductors 84A connecting the flat conductor 83A and the connection conductor 14A. And a straight conductor 84B connecting the flat conductor 83B and the connection conductor 14B.
- the element body 82A is stacked on the upper surface of the element body 82B stacked on the upper surface of the element body 11.
- the element bodies 82A and 82B are both formed of the same material as the element body 11.
- the plate conductor 83A is a substantially rectangular conductor, and is formed on the back surface of the element body 82A.
- the flat conductor 83B is a substantially rectangular conductor like the flat conductor 83A, and is formed on the upper surface of the element body 82A so as to partially face the flat conductor 83A.
- These plate conductors 83A and 83B are connected to both ends of the conductor pattern 12 via linear conductors 84A and 84B, respectively, and are arranged to face each other via the element body 82A to form a capacitor.
- an antenna section 85 having a first resonance frequency is formed by the loading section 4, the inductor section 5, the capacitor section 6, and the multiple resonance capacitor section 81, and The resonance capacitor section 81 and the loading section 4 form a multiple resonance section 86 having the second resonance frequency.
- Fig. 12 shows the VSWR characteristics of the antenna device 80.
- the antenna section 85 shows the first resonance frequency fl
- the multiple resonance section 86 shows the second resonance frequency f2 higher in frequency than the first resonance frequency fl.
- the second resonance frequency can be easily changed by adjusting the material used for the element body 82A and the area of the flat conductors 83A and 83B facing each other.
- the antenna device 80 configured as described above operates in the same manner as in the first embodiment described above. Although having the effect, by connecting the multiple resonance capacitor section 81 in parallel to both ends of the conductor pattern 12, the multiple resonance section 86 having the second resonance frequency f2 different from the first resonance frequency fl of the antenna section 85 is formed. . Therefore, for example, a small antenna device having two resonance frequencies, such as a 900 MHz band GSM (Global System for Mobile Communication) in Europe and a 1.8 GHzD "DCS (Digital Cellular System) in Europe can be provided.
- GSM Global System for Mobile Communication
- DCS Digital Cellular System
- an antenna device 88 having a meander pattern 87 formed at the tip of the loading section 4 may be used.
- the antenna device 88 is connected to the land 13A of the loading section 4 on the surface of the substrate 2, and a meander pattern 87 having a meander shape is formed.
- the meander pattern 87 is disposed so that its major axis is parallel to the conductive film 3.
- the meander pattern 87 is connected to the tip of the loading section 4. As a result, it is possible to increase the bandwidth and gain of the antenna device.
- the difference between the seventh embodiment and the sixth embodiment is that, in the antenna device 80 of the sixth embodiment, one multi-resonance capacitor unit 81 is connected, but in the seventh embodiment, In the antenna device 90, the multi-resonant capacitor part 91 connected in parallel between the tip of the conductor pattern 12 and almost the center of the conductor pattern 12, and the two ends of the base end of the conductor pattern 12 and almost the center of the conductor pattern 12 And a multi-resonant capacitor unit 92 connected in parallel between them.
- the multiple resonance capacitor portion 91 is composed of flat conductors 93A and 93B formed on the upper and lower surfaces of the element body 82A, and linear conductors 94 connecting the flat conductor 93A and the connection conductor 14A. And is constituted by.
- the multiple resonance capacitor section 92 connects the flat conductors 95A and 95B with the flat conductor 95B and the connection conductor 14B. And a continuous linear conductor 96.
- the plate conductor 93A is a substantially rectangular conductor, and is formed on the back surface of the element body 82A.
- the flat conductor 93B is substantially rectangular like the flat conductor 93A, and is formed on the upper surface of the element body 82A so as to partially face the flat conductor 93A.
- the flat conductor 95A is a substantially rectangular conductor, and is formed on the upper surface of the element body 82A. Further, the flat conductor 95B has a substantially rectangular shape like the flat conductor 95A, and is formed on the back surface of the element body 82A so as to partially face the flat conductor 95A.
- the flat conductors 93B and 95A are formed so as not to contact each other.
- the plate conductors 93A and 95B are connected to both ends of the conductor pattern via straight conductors 94 and 96, respectively.
- the plate conductors 93B and 95A are formed to penetrate the element bodies 82A and 82B, respectively, and are connected to the center of the conductor pattern 12 via through holes filled with a conductive member. In this way, the plate conductors 93A and 93B are arranged opposite to each other via the element body 82A to form one capacitor, and the plate conductors 95A and 95B are arranged opposite to each other to form another capacitor.
- an antenna portion 97 having a first resonance frequency is formed, and a multi-resonance capacitor portion 91 and a conductor pattern 12 between two points connected thereto are provided.
- a first multiple resonance section 98 having a second resonance frequency is formed, and a second multiple resonance section 99 having a third resonance frequency is formed by the multiple resonance capacitor section 92 and the conductor pattern 12 between two points connected thereto. It is formed.
- Fig. 16 shows the VSWR characteristics of the antenna device 90.
- the antenna section 97 shows a first resonance frequency f11
- the first multiple resonance section 98 shows a second resonance frequency f12 higher in frequency than the first resonance frequency f11
- the second multiple resonance section 99 shows a third resonance frequency f13 higher in frequency than the second resonance frequency f12.
- the second resonance frequency can be adjusted by changing the material used for the element body 82A and the area of the flat conductors 93A and 93B facing each other.
- the third resonance frequency can be adjusted by changing the material used for the element body 82A and the area of the flat conductors 95A and 95B facing each other.
- the antenna device 90 configured as described above has the same operation and effect as the above-described sixth embodiment, but has two multi-resonant capacitor portions 91 and 92 arranged at two locations on the conductor pattern 12.
- a first multiple resonance section 98 having the second resonance frequency fl2 and a second multiple resonance section 99 having the third resonance frequency fl3 are formed. Therefore, for example, a small antenna device having three resonance frequencies such as GSM, DCS, and PCS (Personal Communication Services) can be provided.
- a meander pattern 87 having a meander shape and connected to the land 13A of the loading section 4 may be formed.
- FIGS. 17 to 19 an eighth embodiment will be described with reference to FIGS. 17 to 19.
- the same reference numerals are given to the components described in the above embodiment, and the description thereof will be omitted.
- the difference between the eighth embodiment and the seventh embodiment is that in the antenna device 90 of the seventh embodiment, a capacitor is formed by arranging two flat conductors facing each other via the element body 82A.
- the antenna device 100 according to the eighth embodiment is provided with multiple resonance capacitor portions 101 and 102 that form a capacitor by the stray capacitance generated between the antenna device 100 and the conductor pattern 12.
- the multiple resonance capacitor section 101 includes a flat conductor 103 formed on the upper surface of the element body 82A, and a straight conductor 104 connecting the flat conductor 103 and the connection conductor 14A. It is configured.
- the multi-resonant capacitor section 102 is composed of a flat conductor 105 formed on the upper surface of the element body 82A, and a straight conductor 106 connecting the flat conductor 105 and the connection conductor 14B.
- the plate conductor 103 is a substantially rectangular conductor, and is formed on the upper surface of the element body 82B.
- the flat conductor 105 is a substantially rectangular conductor similarly to the flat conductor 103, and is formed on the upper surface of the element body 82B.
- one capacitor is equivalently formed by the floating capacity between the flat conductor 103 and the conductor pattern 12. It is formed.
- another capacitor is equivalently formed by the stray capacitance between the flat conductor 105 and the conductor pattern 12. Is done.
- the flat conductors 103 and 105 are formed so as not to contact each other.
- an antenna section 106 having a first resonance frequency is formed by the loading section 4, the inductor section 5, and the capacitor section 6, and the multiple resonance capacitor section 101 and the
- a first multi-resonant portion 107 having a second resonance frequency is formed by the conductor pattern 12 between the two points connected to the capacitor, and the multi-resonance capacitor portion 102 and the conductor pattern 12 between the two points connected thereto
- a second multiple resonance section having a third resonance frequency is formed.
- FIG. 19 shows the VSWR characteristics of the antenna device 100.
- the antenna section 106 shows the first resonance frequency f21
- the first multiple resonance section 107 shows the second resonance frequency f22 having a higher frequency than the first resonance frequency f21
- the second resonance frequency f22 has a third resonance frequency f23 higher in frequency than the second resonance frequency f21.
- the second resonance frequency can be easily changed by adjusting the material used for the element body 82B and the area of the flat conductor 103.
- the third resonance frequency can be easily changed.
- the antenna device 100 configured as described above has the same operation and effect as those of the above-described seventh embodiment, but the conductor pattern 12 and the plate conductors 103 and 105 are arranged to face each other, and the floating Since the first and second multiple resonance sections 107 and 108 are formed by the capacitance, the configuration is simplified.
- a meander pattern 87 having a meandering shape and connected to the land 13A of the loading section 4 may be formed.
- the antenna device 1 is compatible with, for example, a PDC (Personal Digital Cellular) reception frequency band using an 800 MHz band and a 1.5 GHz band GPS (Global Positioning System), as shown in FIG. This is an antenna device used for the mobile phone 60.
- PDC Personal Digital Cellular
- GPS Global Positioning System
- the mobile phone 110 includes a base 161 and a main body circuit board 162 provided inside the base 161 and provided with a communication control circuit including a high-frequency circuit, and the like. And an antenna device 1 connected to a high-frequency circuit provided on the main body circuit board 162.
- the antenna device 1 is provided with a power supply pin 163 for connecting a power supply unit 126 described later and a high-frequency circuit of the main circuit board 162, and a conductive film connection pattern 136 described later and a ground of the main circuit board 162.
- a GND pin 164 is provided for connection to the power supply.
- the antenna device 1 will be described with reference to a schematic diagram of the antenna device.
- the antenna device 1 includes a substrate 2 made of an insulating material such as a resin, a rectangular conductive film 121 formed on the surface of the substrate 2, and a conductive film 121 formed on the surface of the substrate 2.
- Inductors for connecting the first and second loading portions 123 and 124 arranged in parallel with 121 and the base ends of the first and second loading portions 123 and 124 and the conductor film 121, respectively.
- Section 125 a power supply section 126 for supplying power to a connection point P between the first and second loading sections 123 and 124 and the inductor section 125, and a power supply conductor 127 for connecting the connection point P to the power supply section 126. I have.
- the first loading section 123 includes a first loading element 128, lands 132A and 132B formed on the surface of the substrate 2 for mounting the first loading element 128 on the substrate 2, and lands 132A and 132B. It includes a connecting conductor 120 for connecting 132A to the connection point P, and a lumped constant element 134 formed on the connecting conductor 120 and connecting a dividing portion (not shown) for dividing the connecting conductor 120.
- the first loading element 128 has a rectangular parallelepiped element 135 made of a dielectric material such as alumina and a spirally wound surface of the element 135 in the longitudinal direction. And a linear conductor pattern 136 to be formed. Both ends of the conductor pattern 136 are connected to connection conductors 137A and 137B formed on the back surface of the element body 135 so as to be connected to the lands 132A and 132B, respectively.
- the lumped constant element 134 is constituted by, for example, a chip inductor.
- the second loading section 124 is disposed opposite to the first loading section 123 via the connection point P, and like the first loading section 123, the second loading element 129 Lands 142A and 142B, a connection conductor 130, and a lumped constant element 134.
- the second loading element 129 is similar to the first loading element 128 in FIG. As shown in (b), it is composed of a body 145 and a conductor pattern 146 wound on the surface of the body 145.
- connection conductors 147A and 147B formed on the back surface of the element body 145 so as to be connected to the lands 142A and 142B.
- the inductor portion 124 includes a conductor film connection pattern 131 for connecting the connection conductors 120 and 130 and the conductor film 121, and a dividing portion (formed on the conductor film connection pattern 131 to divide the conductor film connection pattern 131. (Not shown).
- the power supply conductor 127 is a linear pattern that connects the connection conductor 130 and the power supply unit 126 connected to the high-frequency circuit RF.
- a first antenna section 141 is formed by a first loading section 123, an inductor section 5, and a feeding conductor 127, and a second loading section is formed.
- the second antenna unit 142 is formed by the inductor 124, the inductor unit 5, and the power supply conductor 127.
- the first antenna section 141 is configured to have a first resonance frequency by adjusting the electrical length with the length of the conductor pattern 136, the inductance of the lumped element 134, and the inductance of the chip inductor 132, You.
- the second antenna section 142 adjusts the electrical length by adjusting the length of the conductor pattern 146, the inductance of the lumped element 134, and the inductance of the chip inductor 132. It is configured to have a resonance frequency.
- each of the first and second loading units 123 and 124 is shorter than / 4 of the antenna operating wavelength of the first and second antenna units 141 and 142.
- the self-resonant frequency force of the first and second loading sections 123 and 124 is higher than the first and second resonance frequencies which are the antenna operating frequencies of the antenna device 1. Therefore, when the first and second resonance frequencies are considered as a reference, the first and second loading sections 123 and 124 cannot be said to be self-resonant, and therefore, are not self-resonant at the antenna operating frequency. Is different from the helical antenna Yes.
- Fig. 24 (a) shows the VSWR (Voltage Standing Wave Ratio) characteristics of the antenna device 1.
- the first antenna section 141 shows the first resonance frequency fl
- the second antenna section 142 shows the second resonance frequency higher than the first resonance frequency fl. Indicates f2.
- the first resonance frequency fl is made to correspond to the PDC reception frequency band
- the second resonance frequency f2 is made to correspond to the 1.5 GHz band GPS.
- the first resonance frequency fl corresponds to the reception frequency band
- the physical length of the antenna element parallel to the conductor film 121 can be reduced. Even if it is shorter than 1/4 of the operating wavelength, the electrical length will be 1/4 of the antenna operating wavelength. Therefore, the physical length can be significantly reduced.
- the lumped constant elements 134 and 124 provided in the first and second loading sections 123 and 124 respectively allow the first and second resonance frequencies fl and without adjusting the lengths of the conductor patterns 126 and 136. f2 can be set. Accordingly, when setting the first and second resonance frequencies fl and f2, it is necessary to change the number of turns of the conductor patterns 126 and 136 according to conditions such as the ground size of the housing on which the antenna device 1 is mounted. Further, it is not necessary to change the size of the first and second loading elements 128 and 129 themselves by changing the number of windings. Therefore, it is easy to set the first and second resonance frequencies fl and f2.
- an impedance adjustment unit 145 may be formed between the connection point P and the power supply unit 126 as shown in FIG.
- the impedance adjusting unit 145 is configured by, for example, a chip capacitor, and is arranged so as to connect to a dividing unit (not shown) for dividing the power supply conductor 127. This makes it possible to easily match the impedance of the power supply unit 126 by adjusting the capacitance of the chip capacitor.
- the first antenna section 141 includes the first loading section 123, the inductor section 5, and the power supply conductor.
- the antenna device 50 of the tenth embodiment includes a first loading section 123, an inductor section 5, a power supply conductor 127, and a first loading section. This is a point formed by the meander pattern 151 formed at the tip of the portion 123.
- a meander pattern 151 having a meander shape is formed on the surface of the substrate 2 so as to be connected to the land 132B of the first loading portion 123.
- the meander pattern 151 is arranged so that its major axis is parallel to the conductor film 3.
- a first antenna section 155 having a first resonance frequency is formed by the first loading section 123, the meander pattern 151, the inductor section 125, and the feed conductor 127.
- the second loading section 124, the inductor section 5, and the feed conductor 127 form a second antenna section 142 having a second resonance frequency.
- the antenna device 50 configured as described above has the same operation and effect as the antenna device 1 in the ninth embodiment, but the meander pattern 151 is connected to the first loading section 123. In addition, it is possible to increase the bandwidth and gain of the first antenna unit 155.
- the meander pattern 151 may be connected to the tip of the first and second loading sections 123 and 124, which may be connected to the tip of the second loading section 124.
- an impedance adjustment unit 145 may be formed between the connection point P and the power supply unit 126.
- the first antenna section includes the first loading section 123, the inductor section 5, and the power supply conductor 127.
- the meander pattern 151 formed at the tip of the first loading section 4 whereas the antenna device 70 according to the eleventh embodiment has the first antenna section 171 that is the tip of the meander pattern 151. This is provided with an extension member 172 that is connected to the second member.
- the extension member 172 is a plate-shaped metal member bent substantially in an L shape, and one end of the extension member 172 is attached to and fixed to the back surface of the substrate 2. And an extension 174 provided to bend from the end.
- the substrate mounting portion 173 is fixed to the substrate 2 with, for example, solder or the like, and is connected to a front end of a meander pattern 151 provided on the surface of the substrate 2 via a through hole 102a formed in the substrate 2.
- the extension part 174 is arranged such that its plate surface is substantially parallel to the substrate 2 and its tip is directed toward the first loading element 128. Note that the length of the extension member 172 is appropriately set according to the first resonance frequency of the first antenna section 171.
- FIG. 30 shows the VSWR frequency characteristics of the antenna device 70 at a frequency of 800 MHz to 950 MHz.
- Fig. 31 shows the directivity of the radiation pattern of the vertically polarized XY plane at each frequency.
- Fig. 31 (a) shows the directivity at a frequency of 832MHz
- Fig. 31 (b) shows the directivity at a frequency of 851MHz
- Fig. 31 (c) shows the directivity at a frequency of 906MHz
- Fig. 31 (d) shows the directivity at a frequency of 925MHz. Directivity is shown.
- the maximum value was 4.02 dBd, the minimum value was 6.01 dBd, and the average value was -4.85 dBd.
- the maximum value was 1.36 dBd, the minimum value was -6.03 dBd, and the average force S was -4.78 dBd.
- the force S_2 was 49dBd, the maximum / J ⁇ value was S_7.9dBd, and the average value was S_5.19dBd.
- the maximum force was S_3.23 dBd, the maximum value was _9.61 dBd, and the average value was _6.24 dBd.
- the extension member 172 is connected to the tip of the meander pattern 151.
- the first antenna unit 171 having a wider band and a higher gain can be used.
- the extension 174 toward the first loading element 128, the space in the housing of the mobile phone including the antenna device 70 can be effectively used. Further, since the extension portion 174 is arranged apart from the substrate 2, the influence of the high-frequency current flowing through the first loading element 128 and the meander pattern 151 can be reduced.
- the extension member 172 is connected to the distal end of the second loading section 124 and can be connected to the first and second loading sections 123, 124. Respectively.
- extension member 172 may be provided on the front surface side of the substrate 2.
- an impedance adjustment unit 145 may be provided between the connection point P and the power supply unit 126.
- the communication device is a mobile phone 201 as shown in FIG. 32, which includes a housing 202, a communication control circuit 203, and an antenna device 204.
- the housing 202 includes a first housing main body 211, and a second housing main body 213 that is foldable via a first housing main body 210 and a hinge mechanism 212.
- An operation key unit 214 including numeric keys and the like and a microphone 215 for inputting a transmission voice are provided on the inner side of the first housing body 211 when folded.
- an antenna housing portion 211a for housing the antenna device 204 shown in FIG. 33 is provided in the same direction as the long axis direction of the first housing body 211. It is formed to protrude.
- a communication control circuit 203 including a high-frequency circuit is provided inside the first housing body 211.
- the communication control circuit 203 is electrically connected to a control circuit connection terminal 228 and a ground connection terminal 229 described later provided in the antenna device 4.
- a display 216 for displaying characters and images and a speaker 217 for outputting a received voice are provided on the inner side of the second housing main body 213 when folded.
- the antenna device 204 includes a substrate 221, a ground connection conductor (ground connection portion) 222 formed on the surface of the substrate 221, and the longitudinal direction of the substrate 221.
- a first loading portion 223 disposed on the surface of the substrate 221 so as to be parallel to the axial direction, and a surface of the substrate 221 such that its longitudinal direction is perpendicular to the major axis direction of the first housing body 211.
- the second loading section 224 disposed thereon, the inductor section 225 for connecting the base end of each of the first and second loading sections 223, 224 and the ground connection conductor 222, and the first and second loading sections 223.
- a power supply section 226 for supplying power to a connection point P between the inductor section 225 and a power supply conductor 227 branched from the inductor section 225 to electrically connect the connection point P to the power supply section 226.
- the substrate 221 has a substantially L-shape having a first substrate portion 221a extending in one direction and a second substrate portion 221b bent from the first substrate portion 221a and extending laterally. It is composed of insulating materials such as.
- the control circuit connection terminal 28 connected to the high-frequency circuit of the communication control circuit 203 and the ground connection terminal 229 connected to the ground of the communication control circuit 203 are provided on the back surface of the substrate 221.
- the control circuit connection terminal 228 is connected to the power supply section 226 via a through hole formed in the substrate 221.
- the ground connection terminal 229 is connected to the ground connection conductor 222 via a through hole.
- the first loading unit 223 includes a first loading element 231 and a land 232A formed on the surface of the first substrate unit 221a for mounting the first loading element 231 on the first substrate unit 221a. 232B, a connection conductor 233 connecting the land 232A and the connection point P, and a lumped constant element 234 formed on the connection conductor 233 and connecting a dividing portion (not shown) for dividing the connection conductor 233. .
- the first loading section 223 is stored in the antenna storage section 21 la. It is configured to be.
- the first loading element 231 includes a rectangular parallelepiped element 235 such as alumina, which also has a dielectric force, and a spiral shape formed on the surface of the element 235 in the longitudinal direction. It is composed of a wound linear conductor pattern 236.
- connection conductors 237A and 237B formed on the back surface of the element body 235 so as to be connected to the lands 232A and 232B.
- the lumped constant element 234 is formed of, for example, a chip inductor.
- the second loading unit 224 is disposed on the second substrate unit 221b, and includes the second loading element 241, the lands 242A and 242B, and the connecting conductor. 243 and a lumped element 244. Further, the second loading portion 224 is configured to be arranged along the inner surface side of one side wall of the first housing main body 211.
- the second loading element 241 is composed of a body 245 and a conductor pattern 246 wound on the surface of the body 245, as shown in FIG. Be composed.
- connection conductors 247A and 247B formed on the back surface of the element body 245 so as to be connected to the lands 242A and 242B, respectively.
- the inductor section 225 is formed on the ground connection conductor 22 2 side of the branch point between the L-shaped pattern 251 connecting the connection point P and the ground connection conductor 222 and the power supply conductor 227 of the L-shaped pattern 251. And a chip inductor 252 for connecting a dividing portion (not shown) for dividing the L-shaped pattern 251.
- the power supply conductor 227 is a linear pattern connecting the L-shaped pattern 251 and the power supply unit 226 connected to the communication control circuit 203.
- a first antenna device 253 is formed by a first loading portion 223, an inductor portion 225, and a feed conductor 227, and a second loading portion 224 is formed.
- a second antenna device 254 is formed by the inductor section 225 and the feed conductor 227.
- RF indicates a high-frequency circuit provided in the communication control circuit 203.
- the first antenna device 253 has a length of the conductor pattern 236 and an inductance of the lumped element 234. By adjusting the electrical length with the inductance of the chip inductor 252 and the inductance, the first inductor 252 is configured to have the first resonance frequency.
- the second antenna device 254 adjusts the second resonance frequency by adjusting the electric length with the length of the conductor pattern 246, the inductance of the lumped constant element 244, and the inductance of the chip inductor 252. It is configured to have.
- first and second loading units 223 and 224 are configured such that their physical lengths are shorter than 1Z4 of the antenna operating wavelength of the first and second antenna devices 253 and 254.
- the self-resonant frequency forces of the first and second loading units 223 and 224 are higher than the first and second resonance frequencies that are the antenna operating frequencies of the antenna device 204. Therefore, since the first and second loading sections 223 and 224 do not self-resonate with respect to the first and second resonance frequencies, they have a property that is different from that of a helicopter antenna that self-resonates at the antenna operating frequency. It is different.
- the electrical length of the antenna is not larger than that of the antenna. It is 1/4 of the operating wavelength. As a result, the physical length can be significantly reduced.
- the first loading section 223 is arranged inside the antenna housing section 21 la, and the second loading section 224 is arranged along the inner surface of one side wall of the first housing body 211, so that the antenna device 204 Occupies a small space, and the space factor is improved.
- the transmission / reception characteristics of the first antenna device 253 can be improved.
- the first and second resonance frequencies are not set by adjusting the lengths of the conductor patterns 236 and 246 by the lumped constant elements 234 and 244 provided in the first and second loading sections 223 and 224, respectively. Can be. Thus, the first and second resonance frequencies can be easily adjusted without changing the ground size of substrate 221.
- the antenna device 1 according to the present invention will be specifically described with reference to Examples 1 to 3.
- the antenna device 1 according to the first embodiment was manufactured.
- the loading section 4 of the antenna device 1 is made of alumina and has a rectangular parallelepiped body 11 having a length L5 of 27 mm, a width L6 of 3.Omm, and a thickness L7 of 6 mm.
- a copper wire having a diameter ⁇ of 0.2 mm is wound as a conductor pattern 12 on the surface so as to have a center interval W1 of 1.5 mm and a spiral shape.
- a loading portion 51 of the antenna device 50 is formed of alumina and has a thickness L8 of 1.0 mm on the surface of a rectangular parallelepiped body 11 having a width W2 of 0.2 mm. Is formed in a meandering shape such that the length L9 in the width direction of the body 11 is 4 mm, the length L10 in the longitudinal direction of the body 11 is 4 mm, and one cycle is 12 mm. .
- FIG. 39 and FIG. 40 show the frequency characteristics of VS WR of antenna device 1 and antenna device 50 at frequencies of 400 to 500 MHz, respectively.
- the antenna device can be downsized even in a relatively low frequency region such as a 400 MHz band.
- the antenna device 70 according to the fifth embodiment was manufactured as Example 3, and an antenna device without the meander pattern 71 was manufactured as a comparative example.
- FIGS. 41 (a) and 41 (b) show the VS WR frequency characteristics of the antenna devices of Example 3 and Comparative Example at frequencies of 800 to 950 MHz, respectively.
- FIGS. 42 (a) and 42 (b) show radiation patterns of vertically polarized waves in the antenna devices of Example 3 and the comparative example, respectively.
- the force S_2 was 43 dBd, the maximum / J ⁇ value was S_4. L ldBd, and the average was 1.45 dBd.
- the antenna device of the comparative example has a VSWR
- Example 4 the mobile phone 1 according to the twelfth embodiment was manufactured, and the frequency characteristics of VSWR (Voltage Standing Wave Ratio) at a frequency of 800 to 950 MHz were determined. The result is shown in FIG.
- VSWR Voltage Standing Wave Ratio
- the first antenna device 53 has a first resonance frequency fl
- the second antenna device has a second resonance frequency f2 higher than the first resonance frequency.
- the VSWR at 848.37 MHz (frequency f3 shown in FIG. 43), which is a frequency near the first resonance frequency fl, was 1.24.
- the maximum value is 1.21 dBi
- the minimum value is 0.61 dBi
- the average value is 0.86 dBi
- the maximum value is 1.17 dBi and the minimum value is The average value was 22.21 dBi and the average value was 1.16 dBi.
- an antenna device 262 in which a dividing portion (not shown) is formed in the feed conductor 27 and a chip capacitor (impedance adjusting portion) 261 for connecting the dividing portion may be provided.
- the impedance adjustment unit is not limited to a chip capacitor, but may be an inductor.
- the force at which the antenna operating frequency is set to 430 MHz is not limited to this frequency, but may be other antenna operating frequencies.
- the antenna device of the present invention has a spiral shape in which the conductor pattern is wound on the surface of the element body, but may have a meander shape formed on the surface of the element body.
- the conductor pattern is not limited to a spiral shape or meander shape, but may be another shape.
- a chip inductor may be used as long as the impedance in the power feeding section using the chip capacitor is adjusted.
- a magnetic material using alumina which is a dielectric material, or a composite material having both a dielectric material and a magnetic material may be used.
- the antenna device of the present invention by combining the loading section and the inductor section, even if the physical length of the antenna element parallel to the end of the conductive film is shorter than 1/4 of the antenna operating wavelength, the electric power is reduced. A length of 1/4 of the antenna operating wavelength can be obtained. Thereby, the physical length can be significantly reduced. Therefore, the antenna device can be reduced in size, and can be applied to a built-in antenna device of a practical wireless device even in a relatively low frequency band such as a 400 MHz band. Further, the first and second resonance frequencies can be easily set by adjusting the inductance of the inductor section.
- one of the two loading units is housed in the antenna housing unit, and the other is arranged along the inner surface of one side wall of the housing main body, thereby controlling communication.
- the space factor is improved without restricting the arrangement position of the circuit.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04807694A EP1703586A4 (en) | 2003-12-25 | 2004-12-24 | ANTENNA DEVICE AND COMMUNICATION DEVICE |
CNA2004800420267A CN1926720A (zh) | 2003-12-25 | 2004-12-24 | 天线装置以及通信机器 |
US10/596,812 US7777677B2 (en) | 2003-12-25 | 2004-12-24 | Antenna device and communication apparatus |
US12/788,175 US8212731B2 (en) | 2003-12-25 | 2010-05-26 | Antenna device and communication apparatus |
US12/788,749 US7859471B2 (en) | 2003-12-25 | 2010-05-27 | Antenna device and communication apparatus |
Applications Claiming Priority (12)
Application Number | Priority Date | Filing Date | Title |
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JP2003-430022 | 2003-12-25 | ||
JP2003430022 | 2003-12-25 | ||
JP2004-071513 | 2004-03-12 | ||
JP2004070875 | 2004-03-12 | ||
JP2004-070875 | 2004-03-12 | ||
JP2004071513A JP4329579B2 (ja) | 2003-12-25 | 2004-03-12 | アンテナ装置 |
JP2004-228157 | 2004-08-04 | ||
JP2004228157A JP2005295493A (ja) | 2004-03-12 | 2004-08-04 | アンテナ装置 |
JP2004-252435 | 2004-08-31 | ||
JP2004252435A JP2006074176A (ja) | 2004-08-31 | 2004-08-31 | 通信機器 |
JP2004302924A JP4089680B2 (ja) | 2003-12-25 | 2004-10-18 | アンテナ装置 |
JP2004-302924 | 2004-10-18 |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US10/596,812 A-371-Of-International US7777677B2 (en) | 2003-12-25 | 2004-12-24 | Antenna device and communication apparatus |
US12/788,175 Division US8212731B2 (en) | 2003-12-25 | 2010-05-26 | Antenna device and communication apparatus |
US12/788,749 Division US7859471B2 (en) | 2003-12-25 | 2010-05-27 | Antenna device and communication apparatus |
Publications (1)
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WO2005064743A1 true WO2005064743A1 (ja) | 2005-07-14 |
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PCT/JP2004/019337 WO2005064743A1 (ja) | 2003-12-25 | 2004-12-24 | アンテナ装置及び通信機器 |
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US (3) | US7777677B2 (ja) |
EP (2) | EP1703586A4 (ja) |
KR (2) | KR101007529B1 (ja) |
CN (3) | CN102683839A (ja) |
AT (1) | ATE503287T1 (ja) |
DE (1) | DE602004031989D1 (ja) |
HK (1) | HK1176172A1 (ja) |
TW (1) | TW200537735A (ja) |
WO (1) | WO2005064743A1 (ja) |
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CN111066202B (zh) * | 2017-09-08 | 2021-05-28 | 株式会社村田制作所 | 支持双频段的天线装置 |
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Also Published As
Publication number | Publication date |
---|---|
EP1703586A4 (en) | 2008-01-23 |
US20100289708A1 (en) | 2010-11-18 |
KR101007529B1 (ko) | 2011-01-14 |
US20110221642A1 (en) | 2011-09-15 |
HK1176172A1 (en) | 2013-07-19 |
EP1703586A1 (en) | 2006-09-20 |
US7859471B2 (en) | 2010-12-28 |
KR20100110368A (ko) | 2010-10-12 |
US20070285335A1 (en) | 2007-12-13 |
TW200537735A (en) | 2005-11-16 |
DE602004031989D1 (de) | 2011-05-05 |
CN1926720A (zh) | 2007-03-07 |
TWI343671B (ja) | 2011-06-11 |
CN102709687A (zh) | 2012-10-03 |
EP1978595A2 (en) | 2008-10-08 |
ATE503287T1 (de) | 2011-04-15 |
EP1978595A3 (en) | 2008-12-17 |
CN102709687B (zh) | 2013-09-25 |
US7777677B2 (en) | 2010-08-17 |
KR20060129307A (ko) | 2006-12-15 |
EP1978595B1 (en) | 2011-03-23 |
US8212731B2 (en) | 2012-07-03 |
KR100995265B1 (ko) | 2010-11-19 |
CN102683839A (zh) | 2012-09-19 |
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