EP1973196A1 - Dispositif d'antenne et dispositif de communication radio portable comportant un tel dispositif d'antenne - Google Patents

Dispositif d'antenne et dispositif de communication radio portable comportant un tel dispositif d'antenne Download PDF

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Publication number
EP1973196A1
EP1973196A1 EP07445011A EP07445011A EP1973196A1 EP 1973196 A1 EP1973196 A1 EP 1973196A1 EP 07445011 A EP07445011 A EP 07445011A EP 07445011 A EP07445011 A EP 07445011A EP 1973196 A1 EP1973196 A1 EP 1973196A1
Authority
EP
European Patent Office
Prior art keywords
antenna device
radiating element
antenna
radio communication
portable radio
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Withdrawn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
EP07445011A
Other languages
German (de)
English (en)
Inventor
Andrei Kaikkonen
Peter Lindberg
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.)
Laird Technologies AB
Original Assignee
Laird Technologies AB
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 Laird Technologies AB filed Critical Laird Technologies AB
Priority to EP07445011A priority Critical patent/EP1973196A1/fr
Priority to KR1020070056700A priority patent/KR20080086322A/ko
Priority to CNA2008800002724A priority patent/CN101542828A/zh
Priority to PCT/SE2008/000197 priority patent/WO2008115117A1/fr
Priority to TW097109068A priority patent/TW200845479A/zh
Priority to JP2009554481A priority patent/JP5363349B2/ja
Publication of EP1973196A1 publication Critical patent/EP1973196A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates generally to antenna devices and more particularly to an antenna device for use in a radio communication device, such as a mobile phone, which is adapted for radio signals having a relatively low frequency, such as radio signals in the FM band.
  • Internal antennas have been used for some time in portable radio communication devices. There are a number of advantages connected with using internal antennas, of which can be mentioned that they are small and light, making them suitable for applications wherein size and weight are of importance, such as in mobile phones.
  • the FM band is defined as frequencies between 88-108 MHz in Europe or between 76-110 MHz in the USA.
  • Prior art conventional antenna configurations, such as loop antennas or monopole antennas, fitted within the casing of a portable radio communication device will result in unsatisfactory operation in that the antenna either has too bad performance over a sufficiently wide frequency band or sufficient performance over a too narrow frequency band.
  • a conventional FM antenna for portable radio communication devices is provided in the headset wire connected to the communication device.
  • This configuration with a relatively long wire permits an antenna length that is sufficient also for low frequency applications.
  • this solution is obviously not feasible.
  • Another problem is that in case a second antenna, such as a GSM antenna, is provided in the same communication device as the FM antenna, this second antenna interferes with the operation of the FM antenna.
  • a second antenna such as a GSM antenna
  • An object of the present invention is to provide an internal antenna device for use in a portable radio communication device, which operates with sufficient performance throughout a frequency band having a relatively low frequency, such as the FM radio band.
  • the invention is based on the realization that an active internal antenna can be configured as a half-loop antenna.
  • an antenna device for a portable radio communication device adapted for receiving radio signals in at least a first operating frequency band, said antenna device comprising a radiating element comprising a feeding portion, and an amplifier stage connected to the feeding portion of the radiating element and connectable to a receiver device for radio signals, the antenna device being characterized in that the radiating element is a half-loop radiating element.
  • a portable radio communication device comprising such an antenna device is also provided.
  • the antenna device provides operation with sufficient performance throughout a frequency band having a relatively low frequency, such as the FM radio band.
  • a frequency band having a relatively low frequency such as the FM radio band.
  • the antenna device comprises a printed circuit board provided with a ground plane, wherein the feeding portion of the radiating element is provided at or close to one end of the printed circuit board and the end of the radiating element opposite to the feeding portion is grounded at or close to the other end of the printed circuit board. In this way the area of the printed circuit board is used to a maximum.
  • a capacitor is preferably connected between the radiating element and ground relatively close to the feeding portion of the radiating element.
  • This capacitor which preferably has a value of 10-40 pF, increases source resistance seen by the transistor of the amplifier, thus matching noise and increasing stability. Also, since the radiating element is essentially grounded at or close to the ends of the printed circuit board where the E field of a primary antenna device, such as a GSM antenna, is large, cross-talk from this primary antenna is minimized.
  • radiating element is used. It is to be understood that this term is intended to cover electrically conductive elements arranged for receiving and/or transmitting radio signals.
  • an antenna device 1 comprises a radiating element 10 in the form of a non-resonant piece of electrically conductive material.
  • the radiating element is part of a half loop antenna, as will be described in detail below.
  • the radiating element has a feeding portion 11 connected to a shunt capacitor 20 arranged to resonate with the radiating element, amplifier input and an optional ESD protection circuit.
  • the resonant frequency response acts as a band pass filter for signals in the operating frequency band. In the case of operation in the FM band, the pass band is between 88-108 MHz in Europe or between 76-110 MHz in the USA.
  • the function of the resonant frequency response further acts as ESD protection circuit, effectively blocking the major part of ESD pulse spectrum.
  • the filter also eliminates or at least reduces interference from electro magnetic interference (EMI) signals and possibly signals from other antennas provided in the same radio communication device, such as cellular GSM antennas operating at frequencies well above the FM antenna.
  • EMI electro magnetic interference
  • An amplifier stage 30 is arranged after the shunt capacitor 20 for amplifying signals received by the radiating element 10.
  • Signals received and amplified by the antenna device 1 are supplied to an FM receiver circuit 40, which could be a conventional circuit manufactured by Philips Semiconductors and sold under the name HVQFN40.
  • the FM receiver circuit comprises an RF input 41, which is connected to the amplifier 30.
  • the shunt capacitor 20 and amplifier stage 30 are provided relatively close to the radiating element 10 in order to minimize parasitic effects and interference from external sources.
  • FIG. 1 An implementation of the general idea expressed in FIG. 1 will now be described with reference to FIG. 2 .
  • the amplifier stage 30 comprises a field effect transistor (FET) 31 with the gate connected to the shunt capacitor 20, the source connected directly to ground and the drain connectable to the input 41 of the FM receiver circuit 40.
  • FET field effect transistor
  • the transistor In order for the antenna device 1 to operate, the transistor preferably has a minimum noise figure below 1 dB and a gain above 15 dB in the operating frequency band. Also, it is preferred that the transistor has a noise resistance Rn of less than 10 Ohms in order to achieve highest possible signal reception quality for arbitrary antenna configurations.
  • Rn noise resistance
  • a further preferred characteristic of the transistor is that the input capacitance is low, preferably less than 3 pF, in order to obtain high input impedance.
  • this antenna device comprises a radiating element 10 having a feed portion 11, a shunt capacitance, and amplifier stage 30.
  • the shunt capacitance is adjustable, i.e., implemented as a so-called varactor 120, providing a controllable antenna device.
  • the amplifier stage is a so-called cascode amplifier 130.
  • This cascode amplifier comprises a field effect transistor 131 with the gate connected to the radiating element and shunt capacitance, the source connected directly to ground and the drain connected to the source of a second field effect transistor 133.
  • the gate of the second transistor 133 is connected to ground via a capacitor 134.
  • the drain of the second transistor 133 is connectable to the input 41 of the FM receiver circuit 40.
  • an FM transmitter circuit 140 is connected to the radiating element via a switch 141.
  • This switch is necessary if the input impedance Z Tx of the transmitter circuit is much lower, such as ten times lower than the input impedance Z Rx of the amplifier 130 in front of the receiver circuit 40.
  • this switch 141 can be omitted if the input impedance Z Tx of the transmitter circuit is in the same order as the input impedance Z Rx of the amplifier 130.
  • this radiating element can be shared and thus function for both transmission and reception.
  • the transmitter circuit should preferably be connected to the radiating element approximately at feed portion 11.
  • a printed circuit board (PCB) 310 is suitably arranged in a portable radio communication device (not shown in these figures).
  • a ground plane 312 is provided on the PCB.
  • a signal load, corresponding to the above described amplifiers 30, 130, is provided on this PCB, which is preferably a multi-layer PCB.
  • the radiating element 10, which is preferably a wire-shaped electrical conductor, is connected to the amplifier at the feed portion 11, preferably at or close to one end of the PCB. This conductor runs essentially parallel to and at a distance h from the PCB 310 for most of its length.
  • the end or the conductor 10 opposite the end connected to the signal source is connected to the ground plane 312 provided on the PCB 310 at or close to the other end of the PCB.
  • a capacitor 20 is provided between the radiating element and ground relatively close to the feeding portion 11.
  • This capacitor which preferably has a value of 10-40 pF, increases the source resistance seen by the transistor of the amplifier, thus matching noise and increasing stability.
  • the conductor 10 is provided in more than one turn, in the example shown in FIG. 5 in two turns.
  • the conductor of the first half loop is lead through a hole 314 in the PCB and to the lower side thereof.
  • the conductor runs along the PCB, preferably in the form of a micro strip line 10a, from one end of the PCB to the other.
  • the conductor is there lead through a second hole 316 in the PCB to the upper side thereof, along the PCB at a distance thereof, and is finally grounded at the second end of the PCB.
  • the radiation resistance being proportional to the number of loop turns squared, is increased, improving the performance of the antenna.
  • a ferrite inside the loop, schematically referenced 14 can be used with both the embodiment of Fig. 4 and the one of Fig. 6 in order to improve the performance of the antenna device.
  • FIG. 6 A first preferred position of the antenna device according to the invention as described above with reference to FIGs. 1-3 will now be described with reference to FIG. 6 , wherein the general outlines of the casing of a portable radio communication device 300, such as a mobile phone, is depicted. The casing is shown partially cut away so as to not obscure the position of the antenna device, which could be any of the devices described with reference to FIGS 1-3 .
  • the PCB 310 is provided in the casing, having the circuits (not shown) conventionally found in a mobile phone. On the PCB there is also mounted the FM receiver circuit 40. In the upper portion of the casing there is provided an antenna radiating element 320 for receiving and transmitting RF signals for a cellular mobile phone system, such as a GSM system.
  • a cellular mobile phone system such as a GSM system.
  • a battery package (not shown) is also provided towards the back of the casing 300.
  • the FM antenna radiating element 10 is preferably placed so that it is connected to the FM circuit at the end of the PCB opposite to the end where the radiating element 320 is provided. The radiating element then runs along a long side of the PCB until it reaches the other end of the PCB, where it is grounded to the ground plane 312 provided on the PCB 310.
  • the radiating element 10 can be provided so that it also runs along a short side of the PCB, see Fig. 6 , before it is grounded to the ground plane 312 provided on the PCB.
  • the shape and size of the antenna device according to the invention can be varied within the scope defined by the appended claims.
  • the exact antenna configurations can be varied so as to correspond to the shape of the radio communication device, desired performance etc.
  • an antenna device has been described as antenna devices adapted for reception of radio signals in the FM frequency band.
  • other applications are also possible, such as use for digital video broad-casting (DVB) signals in the frequency range of about 400-800 MHz.
  • DVD digital video broad-casting
  • an antenna device for a portable radio communication device has been described with reference to its use in a mobile phone, it will be appreciated that the inventive idea is also applicable to other portable radio communication devices, also devices that are portable but primarily intended for stationary use. Examples thereof could be small clocks, such as travel alarm clocks, TV receivers, or game consoles. Yet a possible application of the antenna device according to the invention is in personal digital assistants (PDAs), MP3 and CD players, FM radio receivers, and laptop computers. A further application is in cars.
  • PDAs personal digital assistants
  • MP3 and CD players such as travel alarm clocks, TV receivers, or game consoles.
  • FM radio receivers such as FM radio receivers
  • laptop computers such as cars.
  • the term portable radio communication device should be construed in a broad sense.
  • FIGs. 6 and 7 include a GSM antenna. It will be appreciated that this could be substituted for a different antenna as long as its operating frequency is well above that of the lower frequency band, such as the FM band.
  • a second antenna can also be omitted.
  • a FET has been described as the preferred transistor type. It will be realized that other types of transistors, such as hetero-junction bipolar transistors (HBT), can be used as well.
  • HBT hetero-junction bipolar transistors
  • Tx part can be implemented also in the first embodiment shown in Fig. 2 . It is likewise appreciated that the capacitor 20 of the first embodiment can be replaced by a varactor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Telephone Set Structure (AREA)
  • Details Of Aerials (AREA)
EP07445011A 2007-03-22 2007-03-22 Dispositif d'antenne et dispositif de communication radio portable comportant un tel dispositif d'antenne Withdrawn EP1973196A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP07445011A EP1973196A1 (fr) 2007-03-22 2007-03-22 Dispositif d'antenne et dispositif de communication radio portable comportant un tel dispositif d'antenne
KR1020070056700A KR20080086322A (ko) 2007-03-22 2007-06-11 안테나 디바이스 및 상기 안테나 디바이스를 포함하는휴대용 무선통신 디바이스
CNA2008800002724A CN101542828A (zh) 2007-03-22 2008-03-14 天线装置和具有该天线装置的便携式无线通信装置
PCT/SE2008/000197 WO2008115117A1 (fr) 2007-03-22 2008-03-14 Dispositif d'antenne et dispositif de radiocommunication portable le comprenant
TW097109068A TW200845479A (en) 2007-03-22 2008-03-14 Antenna device and portable radio communication device comprising such antenna device
JP2009554481A JP5363349B2 (ja) 2007-03-22 2008-03-14 アンテナデバイス及び同アンテナデバイスを備える携帯無線通信デバイス

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07445011A EP1973196A1 (fr) 2007-03-22 2007-03-22 Dispositif d'antenne et dispositif de communication radio portable comportant un tel dispositif d'antenne

Publications (1)

Publication Number Publication Date
EP1973196A1 true EP1973196A1 (fr) 2008-09-24

Family

ID=38016509

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07445011A Withdrawn EP1973196A1 (fr) 2007-03-22 2007-03-22 Dispositif d'antenne et dispositif de communication radio portable comportant un tel dispositif d'antenne

Country Status (6)

Country Link
EP (1) EP1973196A1 (fr)
JP (1) JP5363349B2 (fr)
KR (1) KR20080086322A (fr)
CN (1) CN101542828A (fr)
TW (1) TW200845479A (fr)
WO (1) WO2008115117A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010082891A1 (fr) * 2009-01-16 2010-07-22 Laird Technologies Ab Dispositif d'antenne, système d'antenne et dispositif de radiocommunication portable comprenant un tel dispositif d'antenne
WO2010093308A1 (fr) * 2009-02-12 2010-08-19 Laird Technologies Ab Dispositif d'antenne, système d'antenne et dispositif de radiocommunication portable comprenant un tel dispositif d'antenne
WO2011072740A1 (fr) * 2009-12-17 2011-06-23 Laird Technologies Ab Agencement d'antenne et dispositif de communication radio portable associé

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8471768B2 (en) 2009-12-22 2013-06-25 Nokia Corporation Method and apparatus for an antenna
JP5647023B2 (ja) 2011-01-31 2014-12-24 株式会社ヨコオ 地上放送波受信用アンテナ装置及びその構成部品

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561438A (en) * 1991-11-13 1996-10-01 Seiko Epson Corporation Ferrite Antenna
US5767813A (en) 1993-05-27 1998-06-16 Raytheon Ti Systems, Inc. Efficient electrically small loop antenna with a planar base element
JPH1141128A (ja) * 1997-07-22 1999-02-12 Yokowo Co Ltd アンテナブースタ
EP0933832A2 (fr) * 1998-01-30 1999-08-04 Matsushita Electric Industrial Co., Ltd. Antenne incorporée pour terminaux de radiocommunications
EP1120855A2 (fr) 2000-01-25 2001-08-01 Sony Corporation Antenne
US20040172146A1 (en) 1997-09-17 2004-09-02 Gerhard Schneider Antenna system and apparatus for radio-frequency wireless keyboard
EP1594188A1 (fr) 2003-02-03 2005-11-09 Matsushita Electric Industrial Co., Ltd. Dispositif d'antenne et dispositif de communication sans fil utilisant celui-ci
EP1670096A2 (fr) * 2004-11-05 2006-06-14 Ace Technology Module d'antenne pour un signal de réception à une fréquence de diffusion
WO2006129210A2 (fr) * 2005-05-30 2006-12-07 Nxp B.V. Ensemble antenne a reception simultanee pour equipement de communication sans fil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3201693B2 (ja) * 1994-02-16 2001-08-27 株式会社日立国際電気 小型無線受信機用アンテナ
SE0004724D0 (sv) * 2000-07-10 2000-12-20 Allgon Ab Antenna device
US6904296B2 (en) * 2001-02-09 2005-06-07 Nokia Mobile Phones Limited Internal antenna for mobile communications device
SE525659C2 (sv) * 2003-07-11 2005-03-29 Amc Centurion Ab Antenna device and portable radio communication device comprising such antenna device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561438A (en) * 1991-11-13 1996-10-01 Seiko Epson Corporation Ferrite Antenna
US5767813A (en) 1993-05-27 1998-06-16 Raytheon Ti Systems, Inc. Efficient electrically small loop antenna with a planar base element
JPH1141128A (ja) * 1997-07-22 1999-02-12 Yokowo Co Ltd アンテナブースタ
US20040172146A1 (en) 1997-09-17 2004-09-02 Gerhard Schneider Antenna system and apparatus for radio-frequency wireless keyboard
EP0933832A2 (fr) * 1998-01-30 1999-08-04 Matsushita Electric Industrial Co., Ltd. Antenne incorporée pour terminaux de radiocommunications
EP1120855A2 (fr) 2000-01-25 2001-08-01 Sony Corporation Antenne
EP1594188A1 (fr) 2003-02-03 2005-11-09 Matsushita Electric Industrial Co., Ltd. Dispositif d'antenne et dispositif de communication sans fil utilisant celui-ci
EP1670096A2 (fr) * 2004-11-05 2006-06-14 Ace Technology Module d'antenne pour un signal de réception à une fréquence de diffusion
WO2006129210A2 (fr) * 2005-05-30 2006-12-07 Nxp B.V. Ensemble antenne a reception simultanee pour equipement de communication sans fil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010082891A1 (fr) * 2009-01-16 2010-07-22 Laird Technologies Ab Dispositif d'antenne, système d'antenne et dispositif de radiocommunication portable comprenant un tel dispositif d'antenne
WO2010093308A1 (fr) * 2009-02-12 2010-08-19 Laird Technologies Ab Dispositif d'antenne, système d'antenne et dispositif de radiocommunication portable comprenant un tel dispositif d'antenne
WO2011072740A1 (fr) * 2009-12-17 2011-06-23 Laird Technologies Ab Agencement d'antenne et dispositif de communication radio portable associé

Also Published As

Publication number Publication date
WO2008115117A1 (fr) 2008-09-25
JP5363349B2 (ja) 2013-12-11
CN101542828A (zh) 2009-09-23
KR20080086322A (ko) 2008-09-25
JP2010522463A (ja) 2010-07-01
TW200845479A (en) 2008-11-16

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