WO1999063621A1 - High efficiency, multi-band antenna for a radio communication device - Google Patents
High efficiency, multi-band antenna for a radio communication device Download PDFInfo
- Publication number
- WO1999063621A1 WO1999063621A1 PCT/SE1999/000922 SE9900922W WO9963621A1 WO 1999063621 A1 WO1999063621 A1 WO 1999063621A1 SE 9900922 W SE9900922 W SE 9900922W WO 9963621 A1 WO9963621 A1 WO 9963621A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- band
- antenna
- arm
- communication device
- frequency
- Prior art date
Links
Classifications
-
- 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
- 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
- H01Q9/06—Details
- H01Q9/14—Length of element or elements adjustable
- H01Q9/145—Length of element or elements adjustable by varying the electrical length
-
- 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
-
- 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
Definitions
- the present invention relates generally to radio communication systems and, in particular, to antennas which can be incorporated into portable terminals and which allow the portable terminals to communicate within different frequency bands while simultaneously increasing antenna efficiency.
- the most recent evolution in cellular communication services involves the adoption of additional frequency bands for use in handling mobile communications, e.g., for Personal Communication Services (PCS) services.
- PCS Personal Communication Services
- the Cellular hyperband is assigned two frequency bands (commonly referred to as the A frequency band and the B frequency band) for carrying and controlling communications in the 800 MHz region.
- the PCS hyperband is specified in the United States to include six different frequency bands (A, B, C, D, E and F) in the 1900 MHz region.
- A, B, C, D, E and F six different frequency bands
- PCS1900 J-STD-007
- CDMA IS- 95
- D-AMPS IS-136
- AMPS Cellular hyperband
- Each one of the frequency bands specified for the Cellular and PCS hyperbands is allocated a plurality of traffic channels and at least one access or control channel.
- the control channel is used to control or supervise the operation of mobile stations by means of information transmitted to and received from the mobile stations. Such information may include incoming call signals, outgoing call signals, page signals, page response signals, location registration signals, voice channel assignments, maintenance instructions, hand-off, and cell selection or reselection instructions as a mobile station travels out of the radio coverage of one cell and into the radio coverage of another cell.
- the control or voice channels may operate in either an analog mode, a digital mode, or a combination mode.
- the signals transmitted by a base station in the downlink over the traffic and control channels are received by mobile or portable terminals, each of which have at least one antenna.
- portable terminals have employed a number of different types of antennas to receive and transmit signals over the air interface.
- monopole antennas mounted perpendicularly to a conducting surface have been found to provide good radiation characteristics, desirable drive point impedances and relatively simple construction.
- Monopole antennas can be created in various physical forms. For example, rod or whip antennas have frequently been used in conjunction with portable terminals.
- helical antenna As seen in Figure 1 , a helical antenna allows the design to be shorter by coiling the antenna along its length.
- Tuning of an antenna refers to matching the impedance seen by an antenna at its input terminals such that the input impedance is seen to be purely resistive, i.e., it will have no appreciable reactive component. Tuning can, for example, be performed by measuring or estimating the input impedance associated with an antenna and providing an appropriate impedance matching circuit.
- U.S. Patent No. 4,571,595 to Phillips et al. describes a dual-band antenna having a sawtooth shaped conductor element.
- the dual-band antenna can be tuned to either of two closely spaced apart frequency bands (e.g, centered at 915 MHz and 960 MHz).
- This antenna design is, however, relatively inefficient since it is so physically close to the chassis of the mobile phone.
- Japanese patent no. 6-37531 discloses a helix which contains an inner parasitic metal rod.
- the antenna can be tuned to dual resonant frequencies by adjusting the position of the metal rod. Unfortunately, the bandwidth for this design is too narrow for use in cellular communications.
- Dual-band, printed, monopole antennas are known in which dual resonance is achieve by the addition of a parasitic strip in close proximity to a printed monopole antenna. While such an antenna has enough bandwidth for cellular communications, it requires the addition of a parasitic strip.
- Moteco AB in Sweden has designed a coil matching dual-band whip antenna and coil antenna, in which dual resonance is achieved by adjusting the coil matching component (% ⁇ for 900 MHz and Vi ⁇ for 1800 MHz). While this antenna has relatively good bandwidth and radiation performances, its length is only about 40mm.
- a non-uniform helical dual-band antenna which is relatively small in size is disclosed in copending, commonly assigned patent application no. 08/725,507, entitled “Multiple Band Non-Uniform Helical Antennas,” the entirety of which is incorporated by reference.
- antennas for radio communication devices are mounted directly on the phone chassis.
- the close proximity of the antenna to the user's head degrades the performance of the antenna, and ultimately the communication device when the mobile phone is in the talking position.
- the present invention proposes locating the radiating part of the antenna as far as possible away from the user's head in order to increase radiation efficiency.
- the present invention provides a radio communication device having a multi- band swivel antenna assembly which is designed so as to increase antenna efficiency.
- Exemplary embodiments of the present invention provide an antenna assembly which includes a multi-band radiating antenna element and a multi-band sleeve.
- the multi-band radiator and sleeve allow the antenna to be tuned to multiple resonances.
- the multi-band antenna element and sleeve are attached to the chassis of the communication device via a coaxial feeding cable which serves to isolate those elements from the chassis.
- a ferrite coating is also introduced at the bottom of the coaxial cable in order to reduce the current flow to the chassis.
- Figure 1 illustrates a conventional helical antenna
- Figure 2 illustrates an exemplary radio communication device according to the present invention
- Figure 3 illustrates a multi-band swivel antenna according to the present invention
- Figure 4(a) illustrates a side view of the mobile phone with the multi-band swivel antenna in a stowed position according to the present invention
- Figure 4(b) illustrates a side view of the mobile phone with the multi-band swivel antenna in a fully deployed position according to the present invention
- Figures 5(a) and (b) illustrate the distance between a user's head and the radiator of a conventional antenna structure and the radiator according to the present invention
- Figure 6 illustrates a graphical representation of the performance of the multi- band swivel antenna according to the present invention
- Figure 7 illustrates the radiation patterns at 1800 MHz for a stub antenna and the multi-band swivel antenna according to the present invention
- Figure 8 illustrates the radiation patterns at 900 MHz for a stub antenna and the multi-band swivel antenna according to the present invention.
- FIG. 2 illustrates a radio communication device 100 in accordance with the present invention.
- Communication device 100 includes an antenna assembly 110 which is attached to the body (or chassis) of the phone.
- the antenna assembly 110 is a swivel-type, multi-band antenna, the details of which will be described below.
- the communication device 100 also includes a microphone opening 120 and speaker opening 130 located approximately next to the position of the mouth and ear, respectively, of a user.
- the keypad 140 allows the user to interact with the communication device, e.g., by inputting a telephone number to be dialed.
- FIG. 3 illustrates the multi-band swivel antenna 110 according to the present invention.
- the multi-band swivel antenna is a half- wavelength dipole.
- the antenna of the present invention is self-matched (i.e., no external impedance matching components are needed).
- Multi-band swivel antenna 110 includes a small dual-band radiating element 310.
- One type of dual-band radiator is set forth in copending, commonly assigned, patent application no. 08/958,846, "Multiple Band, Multiple Branch Antenna for Mobile Phone," which is hereby incorporated by reference.
- the small dual-band radiating antenna element 310 is connected to the chassis of the communication device via an inner conductor of the coaxial feeding cable 350. Since it is non-radiating, a coaxial feeding cable 350 acts to isolate the antenna element 310 from the chassis.
- Two conductor arms 420 and 430 are connected at a joint connection point to opposite sides of the outer conductor of the feeding cable 350 near the dual-band antenna element 310. These two arms are of different lengths and together form the dual-band sleeve 315 of the present invention. By controlling the lengths of the conductor arms, the dual-band sleeve 315 is capable of being tuned to different frequencies. Additionally, the gap between the conductor arms and the coaxial cable can be altered in order to increase/decrease bandwidth.
- the first arm 420 of the dual-band sleeve 315 is of a length (generally a quarter or half wavelength of the frequency band to which the arm is to be tuned) and construction so as to be resonant at frequencies in a first lower band
- the second arm 430 is of a length and construction so as to be resonant at frequencies in a second higher band.
- the two arms can be made resonant at any frequency.
- the first band may be the GSM band and the second band may be the DCS band.
- the first arm 420 is approximately 1/4 wavelength of a GSM signal (i.e., 900 MHz)
- the second arm 430 is approximately 1/4 wavelength of a DCS signal (i.e., 1800 MHz).
- the antenna to be easily tuned to dual resonances.
- the first and second bands are GSM and DCS bands, respectively, one skilled in the art will appreciate that other combinations of frequency bands may be implemented without departing from the spirit and scope of the present invention.
- other possible combinations of low and high bands could include GSM+PCS, GSM+WCDMA, DCS+WCDMA, GSM+GPS, GSM+ISM, or any other combination of lower and higher frequency bands.
- the dual-band sleeve can be manufactured as printed metal strips, a wire structure or etched onto a plastic frame.
- the end of the longest of the two arms i.e. , the low-band arm 420
- the end of the longest arm can be formed into a meandering shape, as illustrated in Figure 3.
- the end of the longest arm could alternatively be formed as other shapes, such as a loop or helical shape.
- the dual-band radiating antenna element 310 in conjunction with the dual-band sleeve 315 form the radiating portion of Applicants' multi-band swivel antenna.
- this radiating portion would be at a sufficient distance from the user's head to as to reduce the radiation loss due to the human body. Furthermore, little of the radio frequency emission would be blocked by the user's body which would increase the range and overall efficiency of the communication device.
- a ferrite coating 340 is applied to the feeding cable nearest the end where the cable connects to the chassis. This ferrite coating 340 minimizes the amount of radio frequency currents that returns to the chassis from the radiating portion of the antenna. These currents are unwanted because they are dissipated in the hand and face of the user thereby decreasing the antenna efficiency.
- the dual-band sleeve 315 aids in reducing the current flow down the coaxial cable 350. This is evident from the fact that extremely high impedance (i.e., infinite impedance) exists between the end of the resonant arms 420, 430 and the coaxial cable 350.
- Figures 4(a) and (b) illustrate side views of the radio communication device according to the present invention.
- the multi-band swivel antenna is displayed in a stowed position. In this position, the communication device is considered to be in a paging mode.
- the antenna When in a talking mode, as is illustrated in Figure 4(b), the antenna may be rotated into a fully deployed position.
- FIGS 5(a) and (b) illustrate the proximity of a conventional radiating antenna structure compared to that of the radiator of the present invention.
- the distance of the radiating portion of a conventional antenna is typically 2 cm from a user's head whereas the distance of the radiator, according to present invention, is approximately 12 cm from the user's head.
- the greater distance provided by the present invention would greatly increase antenna efficiency.
- FIG 6 a graphical representation of the performance of the multi-band swivel antenna according to the present invention is provided.
- the antenna was placed in a fully deployed position and the low and high bands were specified as GSM and DCS bands.
- the diagram indicates a first peak corresponding to the GSM frequency band and a second peak corresponding to the DCS frequency band.
- a suitable antenna according to the present invention can be designed to operate in two or more bands corresponding to GSM, DCS, PCS, or other frequency bands.
- the results of radiation pattern tests for Applicants' inventive multi- band swivel antenna compared to a conventional stub antenna are set forth in Figures 7 and 8 for frequencies of 1800 MHz and 900 MHz, respectively.
- the radiation pattern for the multi-band swivel antenna is much more uniform than that of the stub antenna for both 1800 MHz and 900 MHz.
- Many variants and combinations of the techniques taught above may be devised by a person skilled in the art without departing from the spirit or scope of the invention as described by the following claims.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020007013385A KR20010043889A (en) | 1998-05-29 | 1999-05-28 | High efficiency, multi-band antenna for a radio communication device |
JP2000552735A JP2002517924A (en) | 1998-05-29 | 1999-05-28 | High efficiency multi-band antenna for wireless communication equipment |
AU46659/99A AU4665999A (en) | 1998-05-29 | 1999-05-28 | High efficiency, multi-band antenna for a radio communication device |
IL13993099A IL139930A0 (en) | 1998-05-29 | 1999-05-28 | High efficiency multi-band antenna for a radio communication device |
EP99930045A EP1082779A1 (en) | 1998-05-29 | 1999-05-28 | High efficiency, multi-band antenna for a radio communication device |
HK02100059.6A HK1038440B (en) | 1998-05-29 | 2002-01-04 | A radiating portion of an antenna, an antenna including the radiation portion and an radio communication apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/086,619 | 1998-05-29 | ||
US09/086,619 US5977928A (en) | 1998-05-29 | 1998-05-29 | High efficiency, multi-band antenna for a radio communication device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999063621A1 true WO1999063621A1 (en) | 1999-12-09 |
Family
ID=22199792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1999/000922 WO1999063621A1 (en) | 1998-05-29 | 1999-05-28 | High efficiency, multi-band antenna for a radio communication device |
Country Status (10)
Country | Link |
---|---|
US (1) | US5977928A (en) |
EP (1) | EP1082779A1 (en) |
JP (1) | JP2002517924A (en) |
KR (1) | KR20010043889A (en) |
CN (1) | CN1134856C (en) |
AU (1) | AU4665999A (en) |
HK (1) | HK1038440B (en) |
IL (1) | IL139930A0 (en) |
TW (1) | TW419859B (en) |
WO (1) | WO1999063621A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1401051A1 (en) * | 2002-08-29 | 2004-03-24 | Aeromaritime Systembau GmbH | Antenna system for multiple frequency bands |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6111545A (en) * | 1992-01-23 | 2000-08-29 | Nokia Mobile Phones, Ltd. | Antenna |
JPH10261910A (en) * | 1997-01-16 | 1998-09-29 | Sony Corp | Portable radio equipment and antenna device |
US6597698B1 (en) | 1997-12-19 | 2003-07-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Coordinated cell discharge from ATM queue |
US6134427A (en) * | 1998-09-30 | 2000-10-17 | Conexant Systems, Inc. | Using a single low-noise amplifier in a multi-band wireless station |
DE19912465C2 (en) * | 1999-03-19 | 2001-07-05 | Kathrein Werke Kg | Multi-area antenna system |
US6505054B1 (en) * | 1999-07-07 | 2003-01-07 | Ericsson Inc. | Integrated antenna assemblies including multiple antennas for wireless communications devices |
US6229495B1 (en) * | 1999-08-06 | 2001-05-08 | Bae Systems Advanced Systems | Dual-point-feed broadband whip antenna |
US6747605B2 (en) | 2001-05-07 | 2004-06-08 | Atheros Communications, Inc. | Planar high-frequency antenna |
US7181171B2 (en) * | 2001-07-20 | 2007-02-20 | Kyocera Wireless Corp. | System and method for providing auxiliary reception in a wireless communications system |
US6741219B2 (en) | 2001-07-25 | 2004-05-25 | Atheros Communications, Inc. | Parallel-feed planar high-frequency antenna |
US6734828B2 (en) | 2001-07-25 | 2004-05-11 | Atheros Communications, Inc. | Dual band planar high-frequency antenna |
US20030030591A1 (en) * | 2001-08-09 | 2003-02-13 | David Gipson | Sleeved dipole antenna with ferrite material |
US6661392B2 (en) * | 2001-08-17 | 2003-12-09 | Lucent Technologies Inc. | Resonant antennas |
CN1225092C (en) * | 2001-10-13 | 2005-10-26 | 三星电子株式会社 | Mobile communication system having multi-band antenna |
US7091843B1 (en) * | 2002-11-05 | 2006-08-15 | Rajiv Singh Lal | Functional and ornamental vehicle accessories |
USD535984S1 (en) | 2003-01-06 | 2007-01-30 | Rajiv S. Lal | Ring-shaped vehicle accessory |
US7034771B2 (en) * | 2003-09-10 | 2006-04-25 | The Boeing Company | Multi-beam and multi-band antenna system for communication satellites |
KR101062346B1 (en) * | 2004-07-10 | 2011-09-05 | 엘지전자 주식회사 | Antenna device of mobile communication terminal |
US20060119533A1 (en) * | 2004-12-06 | 2006-06-08 | Antenniques Corp.Ltd. | [dual-band antenna] |
JP4308786B2 (en) * | 2005-02-24 | 2009-08-05 | パナソニック株式会社 | Portable radio |
KR20060098111A (en) * | 2005-03-09 | 2006-09-18 | 삼성전자주식회사 | Portable device |
US7154445B2 (en) * | 2005-04-06 | 2006-12-26 | Cushcraft Corporation | Omni-directional collinear antenna |
US7801556B2 (en) | 2005-08-26 | 2010-09-21 | Qualcomm Incorporated | Tunable dual-antenna system for multiple frequency band operation |
US20070057864A1 (en) * | 2005-09-11 | 2007-03-15 | Antenniques Corp. Ltd. | [mono-frequency antenna] |
US8712334B2 (en) | 2008-05-20 | 2014-04-29 | Micron Technology, Inc. | RFID device using single antenna for multiple resonant frequency ranges |
US8711047B2 (en) | 2009-03-13 | 2014-04-29 | Qualcomm Incorporated | Orthogonal tunable antenna array for wireless communication devices |
JP5600987B2 (en) * | 2010-03-26 | 2014-10-08 | ソニー株式会社 | Cobra antenna |
US8730084B2 (en) * | 2010-11-29 | 2014-05-20 | King Abdulaziz City For Science And Technology | Dual mode ground penetrating radar (GPR) |
KR102029762B1 (en) * | 2012-12-18 | 2019-10-08 | 삼성전자주식회사 | Antenna module and electronic apparatus including the same |
CN103247869B (en) * | 2013-05-03 | 2015-03-04 | 中国舰船研究设计中心 | IRA (impulse radiation antenna) ultra-wide band radiation array based on semiconductor switches and ferrite transmission lines |
KR101502391B1 (en) * | 2014-02-28 | 2015-03-13 | 한국과학기술연구원 | Wideband antenna using ferrite |
US10522914B2 (en) * | 2015-12-28 | 2019-12-31 | The Board Of Trustees Of The University Of Alabama | Patch antenna with ferrite cores |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4509056A (en) * | 1982-11-24 | 1985-04-02 | George Ploussios | Multi-frequency antenna employing tuned sleeve chokes |
EP0635898A1 (en) * | 1993-07-14 | 1995-01-25 | Ericsson Inc. | Extra antenna element |
EP0675562A1 (en) * | 1994-03-30 | 1995-10-04 | Deutsche Telekom AG | Antenna for handheld mobile communication apparatus with means for protecting its user from electromagnetic radiation |
WO1997012417A1 (en) * | 1995-09-28 | 1997-04-03 | Galtronics (Uk) Limited | Broad band antenna |
WO1997033340A1 (en) * | 1996-03-04 | 1997-09-12 | Moteco Ab | A device for reducing the output of an antenna |
WO1997049141A1 (en) * | 1996-06-15 | 1997-12-24 | Allgon Ab | Meander antenna device |
US5719587A (en) * | 1994-12-13 | 1998-02-17 | Trimble Navigation Limited | Dual frequency vertical antenna |
WO1998015028A1 (en) * | 1996-10-04 | 1998-04-09 | Telefonaktiebolaget Lm Ericsson | Multi band non-uniform helical antennas |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4571595A (en) * | 1983-12-05 | 1986-02-18 | Motorola, Inc. | Dual band transceiver antenna |
US4746925A (en) * | 1985-07-31 | 1988-05-24 | Toyota Jidosha Kabushiki Kaisha | Shielded dipole glass antenna with coaxial feed |
JPS637531A (en) * | 1986-06-25 | 1988-01-13 | Dainippon Printing Co Ltd | Protective film for optical information recording medium |
DE59205270D1 (en) * | 1991-04-10 | 1996-03-21 | Siemens Ag | Two-way radio with associated device antenna |
JPH0637542A (en) * | 1992-07-10 | 1994-02-10 | Sony Corp | Antenna equipment for portable telephone set |
BR9306081A (en) * | 1993-01-29 | 1997-11-18 | Motorola Inc | Radio antenna set |
US5336896A (en) * | 1993-02-04 | 1994-08-09 | Katz Joseph M | Cellular telephone users protective device |
US5440317A (en) * | 1993-05-17 | 1995-08-08 | At&T Corp. | Antenna assembly for a portable transceiver |
JP3523670B2 (en) * | 1993-10-21 | 2004-04-26 | 原田工業株式会社 | Removable broadband antenna for mobile phones |
JPH07326920A (en) * | 1994-05-27 | 1995-12-12 | At & T Corp | Antenna assembly for portable transceiver |
US5535435A (en) * | 1994-07-11 | 1996-07-09 | Motorola, Inc. | Communication device using antenna having an offset |
US5541609A (en) * | 1995-03-08 | 1996-07-30 | Virginia Polytechnic Institute And State University | Reduced operator emission exposure antennas for safer hand-held radios and cellular telephones |
BR9608617A (en) * | 1995-06-02 | 1999-05-04 | Ericsson Ge Mobile Inc | Printed monopole antenna |
JPH0974304A (en) * | 1995-09-05 | 1997-03-18 | Sharp Corp | Antenna system for portable radio equipment |
US5850612A (en) * | 1995-10-03 | 1998-12-15 | Qualcomm Incorporated | Multi-axis vertically corrected antenna for handheld wireless communications devices |
-
1998
- 1998-05-29 US US09/086,619 patent/US5977928A/en not_active Expired - Lifetime
-
1999
- 1999-05-27 TW TW088108706A patent/TW419859B/en active
- 1999-05-28 JP JP2000552735A patent/JP2002517924A/en not_active Withdrawn
- 1999-05-28 IL IL13993099A patent/IL139930A0/en unknown
- 1999-05-28 CN CNB998067849A patent/CN1134856C/en not_active Expired - Fee Related
- 1999-05-28 AU AU46659/99A patent/AU4665999A/en not_active Abandoned
- 1999-05-28 EP EP99930045A patent/EP1082779A1/en not_active Withdrawn
- 1999-05-28 KR KR1020007013385A patent/KR20010043889A/en not_active Application Discontinuation
- 1999-05-28 WO PCT/SE1999/000922 patent/WO1999063621A1/en not_active Application Discontinuation
-
2002
- 2002-01-04 HK HK02100059.6A patent/HK1038440B/en not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4509056A (en) * | 1982-11-24 | 1985-04-02 | George Ploussios | Multi-frequency antenna employing tuned sleeve chokes |
EP0635898A1 (en) * | 1993-07-14 | 1995-01-25 | Ericsson Inc. | Extra antenna element |
EP0675562A1 (en) * | 1994-03-30 | 1995-10-04 | Deutsche Telekom AG | Antenna for handheld mobile communication apparatus with means for protecting its user from electromagnetic radiation |
US5719587A (en) * | 1994-12-13 | 1998-02-17 | Trimble Navigation Limited | Dual frequency vertical antenna |
WO1997012417A1 (en) * | 1995-09-28 | 1997-04-03 | Galtronics (Uk) Limited | Broad band antenna |
WO1997033340A1 (en) * | 1996-03-04 | 1997-09-12 | Moteco Ab | A device for reducing the output of an antenna |
WO1997049141A1 (en) * | 1996-06-15 | 1997-12-24 | Allgon Ab | Meander antenna device |
WO1998015028A1 (en) * | 1996-10-04 | 1998-04-09 | Telefonaktiebolaget Lm Ericsson | Multi band non-uniform helical antennas |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1401051A1 (en) * | 2002-08-29 | 2004-03-24 | Aeromaritime Systembau GmbH | Antenna system for multiple frequency bands |
Also Published As
Publication number | Publication date |
---|---|
EP1082779A1 (en) | 2001-03-14 |
HK1038440B (en) | 2004-12-03 |
US5977928A (en) | 1999-11-02 |
JP2002517924A (en) | 2002-06-18 |
TW419859B (en) | 2001-01-21 |
IL139930A0 (en) | 2002-02-10 |
CN1303527A (en) | 2001-07-11 |
KR20010043889A (en) | 2001-05-25 |
HK1038440A1 (en) | 2002-03-15 |
AU4665999A (en) | 1999-12-20 |
CN1134856C (en) | 2004-01-14 |
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Legal Events
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