EP1118137A1 - Dual antenna and radio device provided therewith - Google Patents

Dual antenna and radio device provided therewith

Info

Publication number
EP1118137A1
EP1118137A1 EP00956293A EP00956293A EP1118137A1 EP 1118137 A1 EP1118137 A1 EP 1118137A1 EP 00956293 A EP00956293 A EP 00956293A EP 00956293 A EP00956293 A EP 00956293A EP 1118137 A1 EP1118137 A1 EP 1118137A1
Authority
EP
European Patent Office
Prior art keywords
antenna
radio device
transmitting
receiving
additional
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00956293A
Other languages
German (de)
French (fr)
Inventor
Wilhelmus M. C. Dolmans
Petrus G. M. Baltus
Lukas Leyten
Gideon W. Kant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP00956293A priority Critical patent/EP1118137A1/en
Publication of EP1118137A1 publication Critical patent/EP1118137A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/27—Spiral antennas
    • 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
    • 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
    • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical 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
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical antennas
    • 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

Definitions

  • Dual antenna and radio device provided therewith.
  • the present invention relates to a radio device comprising a receiving circuit and/or a transmitting circuit, and an antenna assembly including a receiving antenna coupled to the receiving circuit and/or a transmitting antenna coupled to the transmitting circuit.
  • the present invention also relates to an antenna which is suited for application in the radio device, which antenna comprises an antenna assembly including a receiving antenna and/or a transmitting antenna.
  • Such a radio device and antenna are known from EP-A-0 767 508.
  • the known radio device comprises an antenna assembly in the form of a helical antenna assembly including a receiving antenna and a transmitting antenna.
  • the radio device further comprises a receiving circuit having a receiving/matching filter and a transmitting circuit having a similar transmitting filter.
  • the radio device is provided with a transmit/receive switch or with a duplexor.
  • the radio device is characterized in that the antenna assembly comprises at least one additional antenna part, which additional antenna part is electromagnetically coupled to the receiving antenna and/or the transmitting antenna respectively.
  • the antenna according to the present invention is characterized in that the antenna comprises at least one additional antenna part, which additional antenna part is electromagnetically coupled to the receiving antenna and/or the transmitting antenna respectively.
  • the additional antenna part makes an impedance matching circuit or filter superfluous because the impedances of the receiving antenna and/or transmitting antenna each including said additional antenna part can easily be adapted directly to the input-impedance of the receiving circuit and/or to the output-impedance of the transmitting circuit respectively.
  • the structures with additional antenna parts provide a very good isolation between the receive path and the transmit path.
  • the isolation is generally better than 30 dB for a frequency band in the range of 850 MHz or higher, which can even be achieved without any transmit/receive switch or duplexor at all.
  • an antenna assembly which is helically shaped, or has any other form, which can be electromagnetically coupled to the additional antenna part of any form is suitable for the purpose.
  • An embodiment of the radio device according to the invention providing a flat base structure is characterized in that, the antenna assembly comprises at least one grounded plate. If in particular one grounded plate is coupled, either to at least one of said receiving antenna and transmitting antenna, or vice versa to the at least one additional antenna part, a variety of possible embodiments come within reach.
  • a further embodiment of the radio device according to the invention is characterized in that the antenna assembly has a patch structure. This way the structure of the antenna assembly can be integrated in a layer structure, which reduces the amount of necessary space taken up by the antenna according to the invention. Antennas including ceramic structures have an even more reduced proportion.
  • a still further embodiment of the radio device according to the invention is characterized in that the radio device is provided with a shielding element positioned approximately midway between the receiving antenna with its associated additional antenna part and the transmitting antenna with its associated additional antenna part.
  • the shielding element is a cost effective and small sized rod antenna.
  • the above mentioned matching is easily achieved in another embodiment of the antenna according to the invention, which is characterized in that the receiving antenna and/or the transmitting antenna are/is each provided with windings, and that the additional antenna part is inserted between the windings of the receiving antenna and/or the transmitting antenna respectively.
  • Matching now takes place by simply inserting the additional antenna part between a first and a second, or a second and a third winding etcetera of an antenna, and/or by angular rotation said part between the windings, and/or by influencing the insertion depth or spacial form of said part between or outside the windings.
  • Fig. 1 shows an embodiment of a radio device according to the invention provided with two dual helical antennas according to the invention
  • Fig. 2 shows an impedance versus frequency curve of the antenna of fig. 1.
  • Fig.1 shows an schematic embodiment of a radio device 1.
  • the radio device 1 may only comprise the left receiver part of fig. 1, or it may only comprise the right transmitter part thereof, or may comprise both parts, such that in the latter case the radio device 1 is arranged as a transmitter-receiver, also called transceiver.
  • the radio device 1 also comprises a antenna assembly 2 of any suitable form.
  • the antenna assembly 2 is built up as two dual helical antennas 3 and 4, which are here shown to be similar, but which generally will not be identical.
  • Each antenna 3, 4 comprises in this case several windings 3a, 4a, and additional antenna parts 3b, 4b.
  • Each antenna part 3b, 4b is electromagnetically coupled to its associated windings 3 a, 4a, respectively.
  • Such antenna parts 3b, 4b may have any suitable curved, helical or even straight form, while the parts 3b, 4b are each inserted between the spatial structure, winding or windings 3a, 4a.
  • the antenna 3a and its associated antenna part 3b are electrically separated from one another, but electromagnetically coupled to one another. The same holds for the windings 4a and its associated antenna part 4b.
  • antenna impedance adjustment can take place individually for every pair 3 a, 3b and 4a, 4b by influencing the inserting position of the additional antenna part between a first and a second, or a second and a third winding etcetera, and/or by individual angular rotation of the respective antenna parts 3b, 4b between the windings, and/or by individually influencing the insertion depth or spacial form of said part 3b, 4b between or outside the windings 3 a, 4a respectively.
  • the radio device 1 is provided with a grounded plate 5 serving in this case as a common base for the antenna assembly as a whole.
  • the windings 3 a forming the receiving antenna, and the windings 4a forming the transmitting antenna are each electrically connected to the grounded plate 5.
  • the antenna part 3b of the receiving antenna is in this case connected to an input 6 of an amplifier 7, which generally is of the low noise (LNA) type, whereas the antenna part 4b of the transmitting antenna is connected to an output 8 of a power (PA) amplifier 9.
  • LNA 7 is connected to a receiving (RX) circuit
  • PA 9 is connected to a transmitting (TX) circuit 11 of the radio device 1.
  • the radio device 1 is thus particularly suited for bi-directional voice and/or data transmission, such as with mobile communication apparatus, in particular mobile telephone, without a duplexor being necessary therefor.
  • both above receiving and transmitting antennas 3a, 3b and 4a, 4b respectively showed a sufficient isolation of more than 30 dB at a mutual distance of around 10 cm.
  • Both antennas can easily be integrated on a patch or layered structure possibly including a ceramic structure for very small sized integration, distance and isolation.
  • Application of a probe or shielding element 12 preferably a rod connected to the grounded plate 5 and to be positioned approximately midway between the receiving antenna 3a, 3b, and the transmitting antenna 4a, 4b provided adequate isolation of the respective antennas.
  • Adding the respective antenna parts changed the antenna impedance from approximately 19 ⁇ to approximately 50 ⁇ .
  • the measured bandwidth (at -10 dB return loss at 50 ⁇ ) was around 17,3 MHz at a resonance impedance of 58 ⁇ . This is roughly as shown in fig. 2, which shows impedance versus frequency curves for the real impedance part (upper curve) and the reactive impedance part (lower curve).

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Transceivers (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)

Abstract

A radio device comprises a receiving circuit and/or a transmitting circuit, and an antenna assembly including a receiving antenna coupled to the receiving circuit and/or a transmitting antenna coupled to the transmitting circuit. The antenna assembly comprises at least one additional antenna part, which additional antenna part is electromagnetically coupled to the receiving antenna and/or the transmitting antenna respectively. By means of inserting the additional antenna part between windings of the receiving and/or transmitting antenna, independent antenna impedances adjustment is feasible, which broadens the design flexibility of designers of transmitters and receivers, and makes duplexors, as well as impedance matching circuits superfluous.

Description

Dual antenna and radio device provided therewith.
The present invention relates to a radio device comprising a receiving circuit and/or a transmitting circuit, and an antenna assembly including a receiving antenna coupled to the receiving circuit and/or a transmitting antenna coupled to the transmitting circuit.
The present invention also relates to an antenna which is suited for application in the radio device, which antenna comprises an antenna assembly including a receiving antenna and/or a transmitting antenna.
Such a radio device and antenna are known from EP-A-0 767 508. The known radio device comprises an antenna assembly in the form of a helical antenna assembly including a receiving antenna and a transmitting antenna. The radio device further comprises a receiving circuit having a receiving/matching filter and a transmitting circuit having a similar transmitting filter. Furthermore the radio device is provided with a transmit/receive switch or with a duplexor. Obviously the construction of the known radio device and antenna is complex and its impedance matching is troublesome and comprehensive.
Therefore it is an object of the present invention to provide an improved radio device and antenna, both comprising fewer components and providing possibilities for reduced impedance matching handling and hardware.
Thereto the radio device according to the invention is characterized in that the antenna assembly comprises at least one additional antenna part, which additional antenna part is electromagnetically coupled to the receiving antenna and/or the transmitting antenna respectively. Similarly the antenna according to the present invention is characterized in that the antenna comprises at least one additional antenna part, which additional antenna part is electromagnetically coupled to the receiving antenna and/or the transmitting antenna respectively. It is an advantage of the radio device and antenna according to the invention that the additional antenna part makes an impedance matching circuit or filter superfluous because the impedances of the receiving antenna and/or transmitting antenna each including said additional antenna part can easily be adapted directly to the input-impedance of the receiving circuit and/or to the output-impedance of the transmitting circuit respectively. As both these input and output impedances are mutually different, each of them can now be matched individually and thus better to the respective receiving and transmitting antennas. This decreases the impedance losses and increases the sensitivity of in particular the receiving circuit. In general the design flexibility for receivers and transmitters is broadened, because designers are no longer bound to input and output impedance specifications, which used to lie within very strict limits, because of the narrow impedance ranges of known antennas.
Furthermore, if both the receiving antenna and the transmitting antenna are being used in a transceiver radio device the structures with additional antenna parts provide a very good isolation between the receive path and the transmit path. The isolation is generally better than 30 dB for a frequency band in the range of 850 MHz or higher, which can even be achieved without any transmit/receive switch or duplexor at all. For example an antenna assembly, which is helically shaped, or has any other form, which can be electromagnetically coupled to the additional antenna part of any form is suitable for the purpose.
An embodiment of the radio device according to the invention providing a flat base structure is characterized in that, the antenna assembly comprises at least one grounded plate. If in particular one grounded plate is coupled, either to at least one of said receiving antenna and transmitting antenna, or vice versa to the at least one additional antenna part, a variety of possible embodiments come within reach.
A further embodiment of the radio device according to the invention is characterized in that the antenna assembly has a patch structure. This way the structure of the antenna assembly can be integrated in a layer structure, which reduces the amount of necessary space taken up by the antenna according to the invention. Antennas including ceramic structures have an even more reduced proportion.
A still further embodiment of the radio device according to the invention is characterized in that the radio device is provided with a shielding element positioned approximately midway between the receiving antenna with its associated additional antenna part and the transmitting antenna with its associated additional antenna part. This embodiment is particularly advantageous for mobile equipment applications, such as with mobile telephone, because the mutual distance between both the receiving and transmitting antennas can be reduced to approximately several to maximally 10-15 centimeter, again without duplexor or impedance matching circuitry being necessary. Preferably the shielding element is a cost effective and small sized rod antenna.
In particular the above mentioned matching is easily achieved in another embodiment of the antenna according to the invention, which is characterized in that the receiving antenna and/or the transmitting antenna are/is each provided with windings, and that the additional antenna part is inserted between the windings of the receiving antenna and/or the transmitting antenna respectively. Matching now takes place by simply inserting the additional antenna part between a first and a second, or a second and a third winding etcetera of an antenna, and/or by angular rotation said part between the windings, and/or by influencing the insertion depth or spacial form of said part between or outside the windings.
At present the radio device and antenna according to the invention will be elucidated further together with their additional advantages, while reference is being made to the appended drawing. In the drawing:
Fig. 1 shows an embodiment of a radio device according to the invention provided with two dual helical antennas according to the invention; and
Fig. 2 shows an impedance versus frequency curve of the antenna of fig. 1.
Fig.1 shows an schematic embodiment of a radio device 1. The radio device 1 may only comprise the left receiver part of fig. 1, or it may only comprise the right transmitter part thereof, or may comprise both parts, such that in the latter case the radio device 1 is arranged as a transmitter-receiver, also called transceiver. The radio device 1 also comprises a antenna assembly 2 of any suitable form. In this case the antenna assembly 2 is built up as two dual helical antennas 3 and 4, which are here shown to be similar, but which generally will not be identical. Each antenna 3, 4 comprises in this case several windings 3a, 4a, and additional antenna parts 3b, 4b. Each antenna part 3b, 4b is electromagnetically coupled to its associated windings 3 a, 4a, respectively. Such antenna parts 3b, 4b may have any suitable curved, helical or even straight form, while the parts 3b, 4b are each inserted between the spatial structure, winding or windings 3a, 4a. The antenna 3a and its associated antenna part 3b are electrically separated from one another, but electromagnetically coupled to one another. The same holds for the windings 4a and its associated antenna part 4b. As a consequence antenna impedance adjustment can take place individually for every pair 3 a, 3b and 4a, 4b by influencing the inserting position of the additional antenna part between a first and a second, or a second and a third winding etcetera, and/or by individual angular rotation of the respective antenna parts 3b, 4b between the windings, and/or by individually influencing the insertion depth or spacial form of said part 3b, 4b between or outside the windings 3 a, 4a respectively. In the embodiment as shown the radio device 1 is provided with a grounded plate 5 serving in this case as a common base for the antenna assembly as a whole.
In the embodiment as shown the windings 3 a forming the receiving antenna, and the windings 4a forming the transmitting antenna are each electrically connected to the grounded plate 5. The antenna part 3b of the receiving antenna is in this case connected to an input 6 of an amplifier 7, which generally is of the low noise (LNA) type, whereas the antenna part 4b of the transmitting antenna is connected to an output 8 of a power (PA) amplifier 9. No specific impedance matching circuitry is present between input 6 and LNA 7, and output 8 and PA 9 respectively. LNA 7 is connected to a receiving (RX) circuit 10, and PA 9 is connected to a transmitting (TX) circuit 11 of the radio device 1. The radio device 1 is thus particularly suited for bi-directional voice and/or data transmission, such as with mobile communication apparatus, in particular mobile telephone, without a duplexor being necessary therefor.
It appeared in practise that both above receiving and transmitting antennas 3a, 3b and 4a, 4b respectively showed a sufficient isolation of more than 30 dB at a mutual distance of around 10 cm. Both antennas can easily be integrated on a patch or layered structure possibly including a ceramic structure for very small sized integration, distance and isolation. Application of a probe or shielding element 12 preferably a rod connected to the grounded plate 5 and to be positioned approximately midway between the receiving antenna 3a, 3b, and the transmitting antenna 4a, 4b provided adequate isolation of the respective antennas. Adding the respective antenna parts changed the antenna impedance from approximately 19Ω to approximately 50Ω. The measured bandwidth (at -10 dB return loss at 50Ω) was around 17,3 MHz at a resonance impedance of 58Ω. This is roughly as shown in fig. 2, which shows impedance versus frequency curves for the real impedance part (upper curve) and the reactive impedance part (lower curve).

Claims

CLAIMS:
1. A radio device comprising a receiving circuit and/or a transmitting circuit, and an antenna assembly including a receiving antenna coupled to the receiving circuit and/or a transmitting antenna coupled to the transmitting circuit, characterized in that the antenna assembly comprises at least one additional antenna part, which additional antenna part is electromagnetically coupled to the receiving antenna and/or the transmitting antenna respectively.
2. The radio device according to claim 1, characterized in that the antenna assembly is a helical antenna assembly.
3. The radio device according to claim 1 or 2, characterized in that the antenna assembly comprises at least one grounded plate.
4. The radio device according to claim 3, characterized in that the grounded plate is coupled, either to at least one of said receiving antenna and transmitting antenna, or to the at least one additional antenna part.
5. The radio device according to one of the claims 1-4, characterized in that the antenna assembly has a patch structure.
6. The radio device according to one of the claims 1-5, characterized in that the antenna assembly has a ceramic structure.
7. The radio device according to one of the claims 1-6, characterized in that the radio device is provided with a shielding element positioned approximately midway between the receiving antenna with its associated additional antenna part and the transmitting antenna with its associated additional antenna part.
8. The radio device according to claim 7, characterized in that the shielding element is a rod antenna.
9. An antenna suited for application in the radio device according to one of the claims 1-8, the antenna comprising an antenna assembly including a receiving antenna and/or a transmitting antenna, characterized in that the antenna assembly comprises at least one additional antenna part, which additional antenna part is electromagnetically coupled to the receiving antenna and/or the transmitting antenna respectively.
10. The antenna assembly according to claim 9, characterized in that the antenna assembly is a helical antenna assembly.
11. The antenna according to claim 9 or 10, characterized in that the receiving antenna and/or the transmitting antenna are/is each provided with one or more windings, and that the additional antenna part is inserted between the on or more windings of the receiving antenna and/or the transmitting antenna respectively.
12. The antenna according to claim 11, characterized in that the antenna assembly comprises a grounded plate, which grounded plate is coupled to said windings of the receiving antenna and/or the transmitting antenna.
EP00956293A 1999-08-03 2000-07-24 Dual antenna and radio device provided therewith Withdrawn EP1118137A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00956293A EP1118137A1 (en) 1999-08-03 2000-07-24 Dual antenna and radio device provided therewith

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99202551 1999-08-03
EP99202551 1999-08-03
PCT/EP2000/007180 WO2001009978A1 (en) 1999-08-03 2000-07-24 Dual antenna and radio device provided therewith
EP00956293A EP1118137A1 (en) 1999-08-03 2000-07-24 Dual antenna and radio device provided therewith

Publications (1)

Publication Number Publication Date
EP1118137A1 true EP1118137A1 (en) 2001-07-25

Family

ID=8240522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00956293A Withdrawn EP1118137A1 (en) 1999-08-03 2000-07-24 Dual antenna and radio device provided therewith

Country Status (5)

Country Link
EP (1) EP1118137A1 (en)
JP (1) JP2003506939A (en)
KR (1) KR20010075520A (en)
CN (1) CN1319266A (en)
WO (1) WO2001009978A1 (en)

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KR100447252B1 (en) * 2001-09-10 2004-09-07 (주)씨앤드에스 마이크로 웨이브 A antenna using different element for transmitting and receiving
SE0400801D0 (en) * 2004-03-26 2004-03-26 Asperation Oy Antenna device
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US8121539B2 (en) * 2007-08-27 2012-02-21 Nokia Corporation Antenna arrangement
US20100029350A1 (en) * 2008-08-01 2010-02-04 Qualcomm Incorporated Full-duplex wireless transceiver design
US20100105340A1 (en) * 2008-10-29 2010-04-29 Qualcomm Incorporated Interface for wireless communication devices
CN101916916B (en) * 2010-07-14 2013-11-27 海能达通信股份有限公司 Dual-band antenna
CN103178328A (en) * 2011-12-23 2013-06-26 北京交大思诺科技有限公司 Small-size vehicle-mounted antenna and design method thereof
KR101909921B1 (en) 2013-02-22 2018-12-20 삼성전자주식회사 2-port antenna having optimum impedances of a transmitter and a receiver

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DE3102323C2 (en) * 1981-01-24 1984-06-07 Metalltechnik Schmidt GmbH & Co, 7024 Filderstadt Helical antenna group
JP2832476B2 (en) * 1990-02-14 1998-12-09 望 長谷部 Helical antenna
JP2846482B2 (en) * 1991-01-28 1999-01-13 三菱電機株式会社 Filter / antenna device
SE512062C2 (en) * 1993-07-14 2000-01-17 Ericsson Ge Mobile Communicat Method and apparatus for improving the efficiency and bandwidth of an antenna on a portable equipment
US5859614A (en) * 1996-05-15 1999-01-12 The United States Of America As Represented By The Secretary Of The Army Low-loss aperture-coupled planar antenna for microwave applications
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FI113214B (en) * 1997-01-24 2004-03-15 Filtronic Lk Oy Simple dual frequency antenna
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Also Published As

Publication number Publication date
WO2001009978A1 (en) 2001-02-08
CN1319266A (en) 2001-10-24
KR20010075520A (en) 2001-08-09
JP2003506939A (en) 2003-02-18

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