WO1996025774A1 - Dual rectangular patch antenna system - Google Patents
Dual rectangular patch antenna system Download PDFInfo
- Publication number
- WO1996025774A1 WO1996025774A1 PCT/US1995/015860 US9515860W WO9625774A1 WO 1996025774 A1 WO1996025774 A1 WO 1996025774A1 US 9515860 W US9515860 W US 9515860W WO 9625774 A1 WO9625774 A1 WO 9625774A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mode
- feedpoint
- polarization
- midline
- patch
- Prior art date
Links
Classifications
-
- 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
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/525—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between emitting and receiving antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
Definitions
- the present invention relates generally to antenna systems, and more particularly to patch antenna systems with diversity.
- the strength of a microwave signal can decrease as a result of communication channel impairments due to natural causes such as precipitation, humidity, or terrain and man-made causes such as structures which scatter or block the microwave signal. In some situations the decrease in signal strength prevents reliable communication. Diversity provides multiple opportunities to access the microwave signal and improve the probability of reliable communication. The multiple opportunities to access the microwave signal may be implemented by exploiting redundancies in the time, frequency and/or field domains of the signal, where field domains consist of the spatial, polarization, and radiation pattern attributes of the signal.
- a single dual-mode patch antenna which is a microstrip antenna excited to generate two orthogonal polarizations, has been used for diversity in Motorola's 2.45 GHz radio local area network, RLAN.
- RLAN radio local area network
- the use of a single-mode patch or similar antennas known in the art such as an inverted-F antenna together with a whip antenna is common practice for obtaining field diversity on portable radio handsets, especially in the Japanese cellular arena.
- PCSs such as the Personal Access Communications System, PACS
- PACS Personal Access Communications System
- Typical full-duplex radios with this requirement would employ an antenna switch to select from one of the two antennas providing the field diversity and a diplexer that operates to reduce the coupled energy from the transmitter to the receiver.
- diplexing allows a transmitter signal and a receiver signal to be coupled in a manner that does not degrade either signal.
- controlled length transmission lines are used to provide the proper impedance for both transmitter and receiver filters. This impedance isolation is necessary for efficient operation.
- the filters provide signal isolation by reducing the amount of receiver signal lost to the transmitter and the amount of transmitter signal lost to the receiver. This diplexing operation imposes constraints on the circuit board layout and adds complexity to the transmit and receive filter designs, generally leading to increased insertion loss and the requirement for controlled-phase-length transmission lines between the filters. Time-duplexed systems could replace the diplexer with a second switch to select transmit or receive, but this adds an additional insertion loss to both the transmit and receive paths.
- FIG. 1 is a prior art diagram of a dual-mode patch antenna with two feedpoints.
- FIG. 2 is a prior art diagram of a voltage distribution along the second mode polarization in the patch antenna of FIG. 1.
- FIG. 3 is a diagram of one embodiment of a dual rectangular patch antenna system for providing isolation and diversity in accordance with the present invention.
- FIG. 4 is a diagram of a second embodiment of a dual rectangular patch antenna system for providing isolation and diversity in accordance with the present invention.
- FIG. 5 is a diagram of a third embodiment of a dual rectangular patch antenna system for providing isolation and diversity in accordance with the present invention.
- FIG. 6 is a diagram of a fourth embodiment of a dual rectangular patch antenna system for providing isolation and diversity in accordance with the present invention.
- FIG. 7 is a flow diagram of one embodiment of a method for providing isolation and diversity in accordance with the present invention.
- FIG. 8 is a flow diagram of a second embodiment of a method for providing isolation and diversity in accordance with the present invention.
- FIG. 9 is a diagram of a preferred embodiment of a radio having a dual rectangular patch antenna system for providing isolation and diversity in accordance with the present invention.
- the present invention provides a method, dual rectangular patch antenna system, and radio for providing isolation and diversity while eliminating the need for a diplexer or a second transmit/receive switch.
- FIG. 1 numeral 100, is a prior art diagram of a dual-mode patch antenna with two feedpoints.
- the location of the feedpoint is critical since it directly affects the antenna's polarization and impedance.
- a feedpoint is typically a connection of a center conductor of a coaxial cable to a conducting layer and a connection of a shield of the coaxial cable to a ground plane, with the coaxial cable continuing away from the patch beneath the ground plane.
- a patch (102) in the patch antenna (100) is the conducting layer to which the center conductor is connected, and the ground plane (105) is the second conducting layer.
- the dielectric (104) is a non-conducting material layer, which may be air or some ceramic or fiber/resin composite, between the patch (102) and the ground plane (105).
- a first mode feedpoint (106) provides a first mode polarization (108), and a second mode feedpoint (1 10) provides a second mode polarization (1 12) orthogonal to the first mode polarization (108).
- the arrowed lines denoting modes' polarizations in FIGs. 1 through 6 show the polarization of the relevant mode's radiated electric field in the far-field zone along a central axis perpendicular to the plane of the patch conductor.
- FIG. 2 is a prior art diagram of a voltage distribution (202) along the second mode polarization in the patch antenna of FIG. 1.
- the patch antenna (100) takes advantage of an isolation between the first mode feedpoint (106) and the second mode feedpoint (1 10) to serve as a diplexing connection of transmit and receive filters in a radio frequency front end of a radio.
- greater than 30 dB of isolation can be provided between the feedpoints (106 and 1 10) across a given bandwidth centered on the operating frequency, due to the existence of a voltage null (204) in each mode's voltage distribution in the middle of the patch along a line perpendicular to that mode's polarization.
- the narrow bandwidth problem typically associated with a microstrip patch may be overcome by tailoring the dimensions of the patch to be resonant at the center frequency of the receive band for the receive polarization and resonant at the center frequency of the transmit band for the transmit polarization. Since the transmit and receive filters no longer need to be diplexed, the patch isolation could also allow for lower order filters, which would increase the sensitivity of the receive path and the efficiency of the transmit path. Because a patch antenna can be fabricated using printed circuit board techniques, the isolation between second mode and first mode polarizations of the patch antenna is not only very high, but also very tightly controlled and predictable. The isolation bandwidth typically exceeds the impedance bandwidth of the antenna.
- Typical dimensions for a 2.45 GHz copper patch are 36 mm X 36 mm, on a typical dielectric of a 3 mm thick glass/Teflon layer having a dielectric constant of 2.55.
- FIG. 3, numeral 300 is a diagram of one embodiment of a dual rectangular patch antenna system for providing isolation and diversity in accordance with the present invention
- FIG. 4, numeral 400 is a diagram of a second embodiment of a dual rectangular patch antenna system for providing isolation and diversity in accordance with the present invention.
- Both systems (300 and 400) provide diversity for receive only and comprise a first rectangular patch antenna (302), a second rectangular patch antenna (304 and 402), and a switch (306). The difference between the systems (300 and 400) is in the second rectangular patch antenna (304 and 402).
- the first rectangular patch antenna (302) has a top layer that is a substantially planar conductive rectangular first patch (303) with four coplanar sides, a first midline, and a second midline.
- the first midline is orthogonal to a first side of the first patch, and the second midline is parallel to the first side of the first patch and intersects the first midline at a center of the first patch.
- the first patch (303) comprises a first mode feedpoint (316) for providing a first mode polarization (318) for a transmit path (308) and a second mode feedpoint (312) for providing a second mode polarization (314) for a receive path, which is orthogonal to the first mode polarization (31 8).
- the first mode feedpoint (316) and the second mode feedpoint (312) are located such that an isolation is provided by a voltage null of the first mode polarization along the second midline and a voltage null of the second mode polarization along the first midline.
- the first mode feedpoint (316) is located on the first midline between the first side (323) and the center (31 9) of the first patch
- the second mode feedpoint (312) is located on the second midline between a second side (321 ) and the center (319) of the first patch.
- the first side (323) is adjacent and orthogonal to the second side (321 ).
- the second rectangular patch antenna (304) is spatially separated from the first rectangular patch antenna
- the transmit path (302) is devoid of switches and diplex circuits reducing insertion loss by increasing the radiated power for a given transmitter output. In a time-duplexed system, transmit-to- receive isolation is optimized by setting the antenna switch to select the first rectangular patch antenna (302) during transmit operation.
- the preferred embodiment for transmit-to-receive isolation in a full-duplex system is depicted in FIG. 4.
- the second rectangular patch antenna (402) is spatially separated from the first rectangular patch antenna (302) and has a top layer that is a substantially planar conductive rectangular second patch (403).
- the second patch (403) comprises a third mode feedpoint (404) providing a third mode polarization (406) orthogonal to the first mode polarization (31 8).
- the third mode feedpoint (404) is connected to the switch (306) for diversity. While spatial diversity is maintained in the receive path (408), the benefit of polarization diversity is not.
- the switch (306) is operably coupled to select one of the second mode feedpoint of the first rectangular patch antenna and the third mode feedpoint of the second rectangular patch antenna. The selection is made based on a predetermined signal quality. Well known diversity algorithms may use received signal strength indication, RSSI, to determine the best antenna to use.
- the switch (306) provides spatial diversity in the receive path.
- the RF switch (306) can be implemented using PIN diode circuits or GaAs FET switching circuits as is well known in the art.
- FIG. 5, numeral 500 is a diagram of a third embodiment of a dual rectangular patch antenna system for providing isolation and diversity in accordance with the present invention.
- FIG. 6, numeral 600 is a diagram of a fourth embodiment of a dual rectangular patch antenna system for providing isolation and diversity in accordance with the present invention.
- Both systems comprise a first rectangular patch antenna (502), a second rectangular patch antenna (504), a first switch (506 and 604), and a second switch (508 and 606).
- the difference between the systems shown in FIG. 5 and FIG. 6 is the connection scheme for the first and second switches (506, 604, 508, and 606).
- the first rectangular patch antenna (502) has a top layer that is a substantially planar conductive rectangular first patch (503) with four coplanar sides, a first midline, and a second midline.
- the first midline is orthogonal to a first side (523) of the first patch (503), and the second midline is parallel to the first-side (523) of the first patch (503) and intersects the first midline at a center (519) of the first patch (503).
- the first patch (503) comprises a first mode feedpoint (518) for providing a first mode polarization (520) and a second mode feedpoint (514) for providing a second mode polarization (516) orthogonal to the first mode polarization (520).
- the first mode feedpoint (518) and the second mode feedpoint (514) are located such that an isolation is provided by a voltage null of the first mode polarization (520) along the second midline and a voltage null of the second mode polarization along the first midline.
- the first mode feedpoint (518) is located on the first midline between the first side (523) and the center (519) of the first patch
- the second mode feedpoint (514) is located on the second midline between a second side (521 ) and the center (519) of the first patch (503).
- the first side (523) is adjacent and orthogonal to the second side (521 ).
- the second rectangular patch antenna (504) is spatially separated from the first rectangular patch antenna (502) and has a top layer that is a substantially planar conductive rectangular second patch (505) with four coplanar sides, a third midline, and a fourth midline.
- the third midline is orthogonal to a first side (529) of the second patch (505), and the second midline is parallel to the first side (529) of the second patch and intersects the first midline at a center (525) of the second patch.
- the second patch (505) comprises a third mode feedpoint (526) for providing a third mode polarization (528) and a fourth mode feedpoint (522) for providing a fourth mode polarization (524) orthogonal to the third mode polarization (528).
- the third mode feedpoint (526) and the fourth mode feedpoint (522) are located such that an isolation is provided by a voltage null of the third mode polarization (528) along the fourth midline and a voltage null of the second mode polarization along the third midline.
- the third mode feedpoint (526) is located on the first midline between the first side (529) and the center (525) of the second patch, and the fourth mode feedpoint (522) is located on the fourth midline between a second side (527) and the center (525) of the second patch (505).
- the first side (529) is adjacent and orthogonal to the second side (527).
- the first switch (506) is operably coupled to select one of the second mode feedpoint (514) of the first rectangular patch antenna (502) and the third mode feedpoint
- the second switch (508) is operably coupled to select one of the first mode feedpoint (518) of the first rectangular patch antenna (502) and the fourth mode feedpoint (522) of the second rectangular patch antenna (504) for providing spatial diversity and polarization diversity in the transmit path (512).
- the first switch (604) is operably coupled to select one of the second mode feedpoint (514) of the first rectangular patch antenna (502) and the fourth mode feedpoint (522) of the second rectangular patch antenna (504) for providing spatial diversity in the receive path (608).
- the second switch (606) is operably coupled to select one of the first mode feedpoint (518) of the first rectangular patch antenna (502) and the third mode feedpoint (526) of the second rectangular patch antenna (504) for providing spatial diversity in the transmit path (610). This arrangement is advantageous for applications where the first rectangular patch antenna and the second rectangular patch antenna do not lie on the same plane since pattern diversity is provided.
- the selection made by the switches is based on one or more predetermined signal qualities.
- Well known diversity algorithms may use received signal strength indication, RSSI, to determine the best antenna to use.
- FIG. 7, numeral 700 is a flow diagram of one embodiment of a method for providing isolation and diversity in accordance with the present invention.
- the first step is providing, by a first mode feedpoint on a first rectangular patch antenna, a first mode polarization (702).
- the second step is providing, by a second mode feedpoint on a first rectangular patch antenna, a second mode polarization orthogonal to the first mode polarization
- the first mode feedpoint and the second mode feedpoint are located such that an isolation is provided by a voltage null of the first mode polarization in the middle of the first rectangular patch antenna along a line perpendicular to the first mode polarization and a voltage null of the second mode polarization in the middle of the first rectangular patch antenna along a line perpendicular to the second mode polarization.
- the third step is providing, by a third mode feedpoint on a second rectangular patch antenna, a third mode polarization, wherein the second rectangular patch antenna is spatially separated from the first rectangular patch antenna (706).
- the fourth step is providing, by a switch, a selection of either the second mode polarization or the third mode polarization to provide spatial diversity in the receive path (708).
- the third mode polarization may be orthogonal to the first mode polarization to provide signal isolation in the receive path in a full-duplex system.
- the third mode polarization may be orthogonal to the second mode polarization to provide polarization diversity in the receive path.
- the selection of either the second mode polarization or the third mode polarization is made based on a predetermined signal quality.
- Well known diversity algorithms may use received signal strength indication, RSSI, to determine the best antenna to use.
- FIG. 8, numeral 800 is a flow diagram of a second embodiment of a method for providing isolation and diversity in accordance with the present invention.
- the first step is providing, by a first mode feedpoint on a first rectangular patch antenna, a first mode polarization (802).
- the second step is providing, by a second mode feedpoint on a first rectangular patch antenna, a second mode polarization orthogonal to the first mode polarization (804).
- the first mode feedpoint and the second mode feedpoint are located such that an isolation is provided by a voltage null of the first mode polarization in the middle of the first rectangular patch antenna along a line perpendicular to the first mode polarization and a voltage null of the second mode polarization in the middle of the first rectangular patch antenna along a line perpendicular to the second mode polarization.
- the third step is providing, by a third mode feedpoint on a second rectangular patch antenna, a third mode polarization (806).
- the fourth step is providing, by a fourth mode feedpoint on a second rectangular patch antenna, a fourth mode polarization orthogonal to the third mode polarization (808).
- the third mode feedpoint and the fourth mode feedpoint are located such that an isolation is provided by a voltage null of the third mode polarization in the middle of the second rectangular patch antenna along a line perpendicular to the third mode polarization and a voltage null of the fourth mode polarization in the middle of the second rectangular patch antenna along a line perpendicular to the fourth mode polarization.
- the fifth step is providing, by a first switch, a selection between one of the second mode feedpoint of the first rectangular patch antenna and the third mode feedpoint of the second rectangular patch antenna to provide spatial diversity in the receive path (810).
- the sixth step is providing, by a second switch, a selection of either the first mode polarization or the fourth mode polarization to provide spatial diversity in the transmit path (812).
- the selection of either the second mode polarization or the third mode polarization is made based on a first predetermined signal quality.
- the selection of either the first mode polarization or the fourth mode polarization is made based on a second predetermined signal quality which may or may not be the same as the first predetermined signal quality.
- Well known diversity algorithms may use received signal strength indication, RSSI, to determine the best antenna to use.
- FIG. 9, numeral 900 is a diagram of a preferred embodiment of a radio having a dual rectangular patch antenna system for providing isolation and diversity in accordance with the present invention.
- Two physically separated patch antennas (904 and 906) can be connected to switches (908 and 910) and mounted on a radio handset (902).
- the radio (902) can transmit and receive on either antenna (904 and 906) simultaneously while incurring only one switch loss, that being the loss of the switch in both the transmit and receive paths that directs the transmitted and received signal to the desired antenna.
- Typical arrangements have a switch to select the antenna and another switch to select transmit or receive.
- the radio (902) exhibits a higher receiver sensitivity as well as a higher radiated power for a given transmitter amplifier output, while allowing for simultaneous transmit and receive.
- One patch antenna (904) may be mounted on the back of the handset located such that it is not obscured by the hand of the operator, while the second patch antenna (906) may be placed in a flip portion at the radio's base. This arrangement provides a degree of space, pattern, and polarization diversity.
- this invention allows the elimination of all switches or diplexer connections from the transmit path, thus maximizing radiated power for a given transmitter amplifier output. This is important for controlling cost and current drain in microwave applications such as RLANs, since a lossy transmit path increases the power requirement of the transmitter amplifier for a given effective radiated power.
- the feedpoint that has been described is a probe feed, but those skilled in the art will recognize that any possible alternative feed structure, such as an aperture feed, microstrip conductive feed, or electromagnetic field proximity feed may also be employed to couple energy to and from the antenna.
- any antenna structure that exhibits isolation and field diversity such as crossed dipoles, crossed inverted-F or crossed slots/apertures, or antennas that implement combinations of left hand/right hand elliptical polarization, may serve as the radiating structure. It is acknowledged that design tradeoffs can be made with modified probe locations that alter achievable isolation. Accordingly, it is intended that all such alterations and modifications be included within the spirit and scope of the invention as defined in the appended claims.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002185133A CA2185133C (en) | 1995-02-16 | 1995-12-06 | Dual rectangular patch antenna system |
EP95944066A EP0761019A4 (en) | 1995-02-16 | 1995-12-06 | Dual rectangular patch antenna system |
AU46131/96A AU677546C (en) | 1995-02-16 | 1995-12-06 | Dual rectangular patch antenna system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/389,540 US5486836A (en) | 1995-02-16 | 1995-02-16 | Method, dual rectangular patch antenna system and radio for providing isolation and diversity |
US08/389,540 | 1995-02-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996025774A1 true WO1996025774A1 (en) | 1996-08-22 |
Family
ID=23538691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/015860 WO1996025774A1 (en) | 1995-02-16 | 1995-12-06 | Dual rectangular patch antenna system |
Country Status (5)
Country | Link |
---|---|
US (1) | US5486836A (en) |
EP (1) | EP0761019A4 (en) |
CN (1) | CN1114240C (en) |
CA (1) | CA2185133C (en) |
WO (1) | WO1996025774A1 (en) |
Families Citing this family (60)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5654717A (en) * | 1995-08-03 | 1997-08-05 | Trimble Navigation, Ltd. | GPS/radio antenna combination |
JPH0964639A (en) * | 1995-08-25 | 1997-03-07 | Uniden Corp | Diversity antenna circuit |
US5943017A (en) * | 1995-12-13 | 1999-08-24 | Ail Systems, Inc. | Dual near-field focused antenna array |
GB2310109B (en) * | 1996-02-08 | 2000-07-05 | Orange Personal Comm Serv Ltd | Antenna arrangement |
US6473134B1 (en) | 1996-06-19 | 2002-10-29 | Matsushita Electric Industrial Co., Ltd. | Television receiver that detects electric field information from a received television signal and stabilizes a detected synchronizing signal according to the electric field information |
US6067055A (en) * | 1996-09-20 | 2000-05-23 | Lcc International Inc. | Polarization diversity antenna array |
US6031503A (en) * | 1997-02-20 | 2000-02-29 | Raytheon Company | Polarization diverse antenna for portable communication devices |
US5937332A (en) * | 1997-03-21 | 1999-08-10 | Ericsson, Inc. | Satellite telecommunications repeaters and retransmission methods |
GB2325348A (en) * | 1997-05-14 | 1998-11-18 | Acer Peripherals Inc | Antenna for wireless telephone |
US6320509B1 (en) | 1998-03-16 | 2001-11-20 | Intermec Ip Corp. | Radio frequency identification transponder having a high gain antenna configuration |
US6362784B1 (en) | 1998-03-31 | 2002-03-26 | Matsuda Electric Industrial Co., Ltd. | Antenna unit and digital television receiver |
IL125674A (en) * | 1998-08-05 | 2004-08-31 | David Zilberberg | Compact mobile telephone for reducing radiation effect |
US6320542B1 (en) * | 1998-09-22 | 2001-11-20 | Matsushita Electric Industrial Co., Ltd. | Patch antenna apparatus with improved projection area |
SE514773C2 (en) * | 1998-09-28 | 2001-04-23 | Allgon Ab | Radio communication unit and antenna system |
US6141539A (en) * | 1999-01-27 | 2000-10-31 | Radio Frequency Systems Inc. | Isolation improvement circuit for a dual-polarization antenna |
US6069589A (en) | 1999-07-08 | 2000-05-30 | Scientific-Atlanta, Inc. | Low profile dual frequency magnetic radiator for little low earth orbit satellite communication system |
WO2001028035A1 (en) | 1999-10-12 | 2001-04-19 | Arc Wireless Solutions, Inc. | Compact dual narrow band microstrip antenna |
SE516535C2 (en) * | 1999-10-29 | 2002-01-29 | Allgon Ab | Antenna device switchable between a plurality of configuration modes adapted for use in different operating environments and associated method |
SE516536C2 (en) | 1999-10-29 | 2002-01-29 | Allgon Ab | Antenna device switchable between a plurality of configuration states depending on two operating parameters and associated method |
US6917790B1 (en) | 1999-10-29 | 2005-07-12 | Amc Centurion Ab | Antenna device and method for transmitting and receiving radio waves |
FR2803482B1 (en) * | 2000-01-05 | 2002-02-15 | Diffusion Vente Internationale | ELECTRONIC KEY READER |
US6897808B1 (en) | 2000-08-28 | 2005-05-24 | The Hong Kong University Of Science And Technology | Antenna device, and mobile communications device incorporating the antenna device |
US6433742B1 (en) | 2000-10-19 | 2002-08-13 | Magis Networks, Inc. | Diversity antenna structure for wireless communications |
DE10053210A1 (en) * | 2000-10-26 | 2002-05-08 | Siemens Ag | antenna means |
JP2002171190A (en) * | 2000-12-01 | 2002-06-14 | Nec Corp | Compact portable telephone |
US6456245B1 (en) | 2000-12-13 | 2002-09-24 | Magis Networks, Inc. | Card-based diversity antenna structure for wireless communications |
US6456242B1 (en) | 2001-03-05 | 2002-09-24 | Magis Networks, Inc. | Conformal box antenna |
US6496150B1 (en) * | 2001-06-29 | 2002-12-17 | Nokia Corporation | Decoupling between plural antennas for wireless communication device |
WO2003050917A1 (en) * | 2001-12-07 | 2003-06-19 | Skycross, Inc. | Multiple antenna diversity for wireless lan applications |
EP1481442B1 (en) * | 2002-02-26 | 2018-02-07 | Apple Inc. | User terminal antenna arrangement for multiple-input multiple-output communications |
US6930639B2 (en) * | 2002-03-15 | 2005-08-16 | The Board Of Trustees Of The Leland Stanford Junior University | Dual-element microstrip patch antenna for mitigating radio frequency interference |
JP4363936B2 (en) * | 2002-09-26 | 2009-11-11 | パナソニック株式会社 | Antenna for wireless terminal device and wireless terminal device |
EP1427115A1 (en) * | 2002-12-06 | 2004-06-09 | TDK Corporation | Antenna switching circuit |
EP1453136A1 (en) * | 2003-02-26 | 2004-09-01 | Nokia Corporation | A radio apparatus with a planar antenna |
US6933909B2 (en) * | 2003-03-18 | 2005-08-23 | Cisco Technology, Inc. | Multichannel access point with collocated isolated antennas |
US7035584B2 (en) * | 2003-04-28 | 2006-04-25 | Motorola, Inc. | Antenna phase modulator |
CN100459454C (en) * | 2004-07-26 | 2009-02-04 | 电子科技大学 | Diversity antenna assembly in wireless communication terminal |
US20060105730A1 (en) * | 2004-11-18 | 2006-05-18 | Isabella Modonesi | Antenna arrangement for multi-input multi-output wireless local area network |
KR100691606B1 (en) * | 2005-02-19 | 2007-03-12 | 서강대학교산학협력단 | Apparatus and method for Time Division DuplexingTDD communication using polarized duplexer |
US7525485B2 (en) * | 2006-01-10 | 2009-04-28 | Broadcom Corporation | Method and system for antenna geometry for multiple antenna handsets |
US7724194B2 (en) | 2006-06-30 | 2010-05-25 | Motorola, Inc. | Dual autodiplexing antenna |
US20080111748A1 (en) * | 2006-11-10 | 2008-05-15 | Dunn Doug L | Antenna system having plural selectable antenna feed points and method of operation thereof |
US8866691B2 (en) * | 2007-04-20 | 2014-10-21 | Skycross, Inc. | Multimode antenna structure |
US7688273B2 (en) | 2007-04-20 | 2010-03-30 | Skycross, Inc. | Multimode antenna structure |
US8344956B2 (en) | 2007-04-20 | 2013-01-01 | Skycross, Inc. | Methods for reducing near-field radiation and specific absorption rate (SAR) values in communications devices |
ITTO20070420A1 (en) * | 2007-06-13 | 2008-12-14 | Telsey S P A | GATEWAY PROVIDED WITH A MULTI-ANTENNA RECEIVER SYSTEM WITH MISO ARCHITECTURE FOR WI-FI COMMUNICATIONS |
TWI351782B (en) * | 2007-12-25 | 2011-11-01 | Microelectronics Tech Inc | Transceiver for radio-frequency communication |
US8340197B2 (en) * | 2008-02-28 | 2012-12-25 | Invertix Corporation | System and method for modulating a signal at an antenna |
US7973725B2 (en) | 2008-02-29 | 2011-07-05 | Research In Motion Limited | Mobile wireless communications device with selective load switching for antennas and related methods |
US8144060B2 (en) * | 2008-06-02 | 2012-03-27 | 2Wire, Inc. | Multiple feedpoint antenna |
US8411794B2 (en) * | 2008-11-25 | 2013-04-02 | Invertix Corporation | System and method for arbitrary phase and amplitude modulation in an antenna |
US8457251B2 (en) * | 2008-11-25 | 2013-06-04 | Invertix Corporation | System and method for spreading and de-spreading a signal at an antenna |
US8391376B2 (en) * | 2008-11-25 | 2013-03-05 | Invertix Corporation | System and method for electronically steering an antenna |
US20100156607A1 (en) * | 2008-12-19 | 2010-06-24 | Thomas Lankes | Method for activating an RFID antenna and an associated RFID antenna system |
US8467363B2 (en) | 2011-08-17 | 2013-06-18 | CBF Networks, Inc. | Intelligent backhaul radio and antenna system |
US8422540B1 (en) | 2012-06-21 | 2013-04-16 | CBF Networks, Inc. | Intelligent backhaul radio with zero division duplexing |
CN106410377B (en) * | 2015-07-31 | 2019-05-07 | 南京理工大学 | Polarization reconstructable microstrip aerial based on four throw switch of hilted broadsword |
US9553640B1 (en) * | 2015-12-22 | 2017-01-24 | Microsoft Technology Licensing, Llc | Using multi-feed antennas |
US10992049B2 (en) * | 2018-02-23 | 2021-04-27 | Nokia Shanghai Bell Co., Ltd. | Elliptically polarized cavity backed wideband slot antenna |
WO2021002159A1 (en) * | 2019-07-02 | 2021-01-07 | 株式会社村田製作所 | High-frequency module and communication device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4538153A (en) * | 1981-09-07 | 1985-08-27 | Nippon Telegraph & Telephone Public Corp. | Directivity diversity communication system with microstrip antenna |
US5201065A (en) * | 1990-09-13 | 1993-04-06 | Westinghouse Electric Corp. | Planar millimeter wave two axis monopulse transceiver with switchable polarization |
US5270722A (en) * | 1990-12-27 | 1993-12-14 | Thomson-Csf | Patch-type microwave antenna |
US5371507A (en) * | 1991-05-14 | 1994-12-06 | Sony Corporation | Planar antenna with ring-shaped radiation element of high ring ratio |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0779299B2 (en) * | 1986-08-30 | 1995-08-23 | 日本電気株式会社 | Portable radio |
FR2636780B1 (en) * | 1988-09-21 | 1991-02-15 | Europ Agence Spatiale | DIPLEXED COMPOSITE ANTENNA WITH CIRCULAR POLARIZATION |
US5223848A (en) * | 1988-09-21 | 1993-06-29 | Agence Spatiale Europeenne | Duplexing circularly polarized composite |
DE69232020T2 (en) * | 1991-07-30 | 2002-05-29 | Murata Manufacturing Co | Circularly polarized stripline antenna and method for its frequency adjustment |
US5264856A (en) * | 1992-03-06 | 1993-11-23 | Westinghouse Electric Corp. | System and method for detecting radiant energy reflected by a length of wire |
-
1995
- 1995-02-16 US US08/389,540 patent/US5486836A/en not_active Expired - Lifetime
- 1995-12-06 WO PCT/US1995/015860 patent/WO1996025774A1/en not_active Application Discontinuation
- 1995-12-06 EP EP95944066A patent/EP0761019A4/en not_active Withdrawn
- 1995-12-06 CA CA002185133A patent/CA2185133C/en not_active Expired - Fee Related
- 1995-12-06 CN CN95192522A patent/CN1114240C/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4538153A (en) * | 1981-09-07 | 1985-08-27 | Nippon Telegraph & Telephone Public Corp. | Directivity diversity communication system with microstrip antenna |
US5201065A (en) * | 1990-09-13 | 1993-04-06 | Westinghouse Electric Corp. | Planar millimeter wave two axis monopulse transceiver with switchable polarization |
US5270722A (en) * | 1990-12-27 | 1993-12-14 | Thomson-Csf | Patch-type microwave antenna |
US5371507A (en) * | 1991-05-14 | 1994-12-06 | Sony Corporation | Planar antenna with ring-shaped radiation element of high ring ratio |
Non-Patent Citations (1)
Title |
---|
See also references of EP0761019A4 * |
Also Published As
Publication number | Publication date |
---|---|
CN1114240C (en) | 2003-07-09 |
CA2185133C (en) | 1999-07-27 |
CN1145697A (en) | 1997-03-19 |
AU677546B2 (en) | 1997-04-24 |
CA2185133A1 (en) | 1996-08-22 |
EP0761019A1 (en) | 1997-03-12 |
EP0761019A4 (en) | 1998-08-19 |
US5486836A (en) | 1996-01-23 |
AU4613196A (en) | 1996-09-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2185133C (en) | Dual rectangular patch antenna system | |
EP1055266B1 (en) | Dual band diversity antenna having parasitic radiating element | |
EP0623967B1 (en) | Antenna apparatus | |
EP1368855B1 (en) | Antenna arrangement | |
US6515625B1 (en) | Antenna | |
US6864848B2 (en) | RF MEMs-tuned slot antenna and a method of making same | |
EP1782499B1 (en) | System and method for an omnidirectional planar antenna apparatus with selectable elements | |
US5945951A (en) | High isolation dual polarized antenna system with microstrip-fed aperture coupled patches | |
US6771223B1 (en) | Antenna device and portable machine | |
EP2608315B1 (en) | Switchable diversity antenna apparatus and methods | |
EP1148581B1 (en) | Microstrip antenna | |
US6016126A (en) | Non-protruding dual-band antenna for communications device | |
US20010007445A1 (en) | Method for coupling a signal and an antenna structure | |
EP1309103A1 (en) | Antenna system for GSM/WLAN radio operation | |
GB2316540A (en) | Planar antenna and radio apparatus comprising the same | |
WO2001063695A1 (en) | Compact, broadband inverted-f antennas with conductive elements and wireless communicators incorporating same | |
KR20110031983A (en) | Antenna arrangement | |
US20030058168A1 (en) | Multi-frequency band inverted-F antennas with coupled branches and wireless communicators incorporating same | |
US20020123312A1 (en) | Antenna systems including internal planar inverted-F Antenna coupled with external radiating element and wireless communicators incorporating same | |
AU677546C (en) | Dual rectangular patch antenna system | |
WO2002065581A1 (en) | A layered micro strip patch antenna | |
US7149540B2 (en) | Antenna | |
CN112201958B (en) | Multi-frequency antenna, antenna assembly and customer premises equipment | |
JPH09284022A (en) | Portable radio wave equipment | |
CN112993558A (en) | Antenna structure, mainboard and terminal |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 95192522.9 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AU CA CN |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2185133 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1995944066 Country of ref document: EP |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 1995944066 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1995944066 Country of ref document: EP |