EP1919027A1 - Circuit de commutation d'antenne avec un filtre passe-bande et suppression des harmoniques - Google Patents

Circuit de commutation d'antenne avec un filtre passe-bande et suppression des harmoniques Download PDF

Info

Publication number
EP1919027A1
EP1919027A1 EP06022820A EP06022820A EP1919027A1 EP 1919027 A1 EP1919027 A1 EP 1919027A1 EP 06022820 A EP06022820 A EP 06022820A EP 06022820 A EP06022820 A EP 06022820A EP 1919027 A1 EP1919027 A1 EP 1919027A1
Authority
EP
European Patent Office
Prior art keywords
antenna
circuit
frequency
capacitor
radio frequency
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.)
Granted
Application number
EP06022820A
Other languages
German (de)
English (en)
Other versions
EP1919027B1 (fr
Inventor
Wolfgang Ernst
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.)
Panasonic Corp
Original Assignee
Panasonic Corp
Matsushita Electric Industrial Co Ltd
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 Panasonic Corp, Matsushita Electric Industrial Co Ltd filed Critical Panasonic Corp
Priority to EP20060022820 priority Critical patent/EP1919027B1/fr
Publication of EP1919027A1 publication Critical patent/EP1919027A1/fr
Application granted granted Critical
Publication of EP1919027B1 publication Critical patent/EP1919027B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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

Definitions

  • the present invention relates in general to a radio frequency (RF) apparatus, and in particular, to an antenna switching circuit for such a RF apparatus.
  • the RF apparatus of the present invention comprises a RF transceiver circuit incorporating a RF transmitter circuit and a RF receiver circuit for transmitting and receiving RF signals, and an antenna switching circuit for connecting the RF transceiver circuit to one of a plurality of antennas to provide a signal path between the RF transceiver circuit and a selected one of the plurality of antennas.
  • the RF apparatus comprises a RF transmitter circuit for transmitting RF signals, and an antenna switching circuit for connecting the RF transmitter circuit to one of a plurality of antennas to provide a signal path between the RF transmitter circuit and a selected one of the plurality of antennas.
  • the RF apparatus of the present invention is, for example, a wireless communication apparatus, such as a cell phone or a similar wireless device having at least a built-in internal antenna.
  • a wireless communication apparatus such as a cell phone or a similar wireless device having at least a built-in internal antenna.
  • the antenna switching circuit is adapted to connect the RF transceiver circuit to the internal antenna.
  • the antenna switching circuit is adapted to connect the RF transceiver to the external antenna.
  • the signal path to and from the RF transceiver is switched between the internal antenna and the external antenna.
  • a plurality of different types of antennas can be used, for example, a plurality of internal antennas and/or a plurality of external antennas.
  • the antenna switching circuit can be realized by means of a simple mechanical or electronic switch which is operated when the plug of the external antenna cable is inserted in or removed from an external antenna connector.
  • a simple mechanical or electronic switch which is operated when the plug of the external antenna cable is inserted in or removed from an external antenna connector.
  • the RF apparatus is a wireless communication module (w.c.m.) used as a component for electronic devices in order to add wireless communication capability to them.
  • the antenna required for operation of the wireless communication module is selected by design of the electronic device to fit to various parameters, such as space constraints, antenna characteristics and cost.
  • the RF terminals of a wireless communication module are designed to allow for various antenna terminals without changing the printed wiring board of the wireless communication module.
  • a series contact located on the wireless communication module defines the selection of the antenna, as for example:
  • the series contact for antenna selection on the wireless communication module can be for example:
  • the RF apparatus further comprises a frontend bandpass-filter and/or lowpass-filter for filtering a signal received or transmitted via the antenna switching circuit.
  • the purpose of the bandpass-filter or lowpass-filter is (a), during the receiving operation, to suppress disturbances or interferences of the received signal power outside the signal frequency bandwidth, and (b), during transmission operation, to suppress spectral components outside the signal frequency bandwidth of the transmitted signal.
  • harmonics especially the most dominating second and third harmonics, are critical and not desired because of the emission thereof is restricted by law or regulations.
  • FIG. 1 One possible solution for suppression of unwanted harmonics is shown in Figure 1 wherein the RF transceiver circuit (or RF transmitter circuit) 1 having an impedance of Z0 is connected to an antenna connector 3 via conductive line 2.
  • the antenna connector 3 is adapted to be coupled with an external or internal antenna 4.
  • a parallel resonator circuit 5 comprising a capacitor 5a (with capacitance C1) and an inductor 5b (with inductance L1) is connected to line 2.
  • the capacitor 5a and the inductor 5b are chosen to define a parallel resonator circuit having a high impedance compared to Z0 within the signal frequency bandwidth (i.e. nearly no load) and a low impedance compared to Z0 outside the signal frequency bandwidth (i.e. nearly short circuit).
  • this circuit the available suppression of spectral components outside the signal frequency bandwidth with circuit 5 is limited, and in particular, the suppression of the harmonics of the transmitted signals is often insufficient.
  • RF radio frequency
  • Embodiments of the present invention provide improvements in a radio frequency apparatus, and in particular, in an antenna switching circuit, which is used in, for example, wireless communication devices such as mobile phones, personal digital assistants (PDA), Bluetooth apparatuses, and wireless communication modules (w.c.m.) used as components for electronic devices in order to add wireless communication capability to them.
  • wireless communication devices such as mobile phones, personal digital assistants (PDA), Bluetooth apparatuses, and wireless communication modules (w.c.m.) used as components for electronic devices in order to add wireless communication capability to them.
  • FIG. 1 shows a schematic circuit diagram of a radio frequency apparatus comprising a RF transceiver or RF transmitter 1 having an impedance Z0 which is connected to an antenna connector 3 via line 2.
  • the antenna connector 3 is adapted to be coupled with an external antenna 4.
  • a parallel resonator circuit 5 comprising a capacitor 5a and an inductor 5b is connected to line 2.
  • the first terminal of the capacitor 5a and of the inductor 5b is connected to line 2
  • the second terminal of the capacitor 5a and of the inductor 5b is connected to ground.
  • the capacitance C1 of capacitor 5a and the inductance L1 of inductor 5b are chosen to define a resonator circuit having an high impedance compared to Z0 within the signal frequency bandwidth and having a low impedance compared to Z0 outside the signal frequency bandwidth, thus forming a bandpass-filter for the fundamental frequencies.
  • FIG 2 shows a circuit diagram of a radio frequency apparatus according to a first embodiment of the present invention.
  • the RF apparatus comprises a RF transceiver or RF transmitter 1 having an impedance Z0 which is connected to a plurality of antenna connectors 3.1, ..., 3.n via line 2.
  • the antenna connectors 3.1, ..., 3.n are adapted to be coupled with external antennas 4 or intern antennas (not shown).
  • a parallel resonator circuit 5 also comprising a capacitor 5a (capacitance C1) and an inductor' 5b (inductance L1) is connected to line 2, and the first terminal of the capacitor 5a and of the inductor 5b is connected to line 2, and the second terminal of the capacitor 5a and of the inductor 5b is connected to ground.
  • the capacitance C1 of capacitor 5a and the inductance L1 of inductor 5b are chosen to define a parallel resonator circuit serving as a bandpass-filter which theoretically has a high impedance compared to Z0 within the signal frequency bandwidth and a low impedance compared to Z0 outside the signal frequency bandwidth.
  • the inventive circuit configuration of Figure 2 comprises one or more additional inductors 6.1, ..., 6.n (having inductances L21, ..., L2n - merely L21 and L22 are shown in Figure 2) connected to line 2 and coupled between the parallel resonator circuit 5 and each of the antenna connectors 3.1, ..., 3.n.
  • the passive components i.e. the capacitor C1, the inductor L1, and the inductors L21, ..., L2n, are chosen with respect to their common impedance over the whole frequency range such that:
  • the second and third harmonics in the output spectrum of the transmitter (which are the dominant harmonics) can be suppressed in a very effective manner by use of the parasitic reactances, as described above.
  • the self resonances of the capacitor 5a and the inductors 6.1, ..., 6.n which are necessary for suppression of the second and third harmonics can be obtained by selection of suitable component technologies for the capacitor 5a and the inductors 6.1, ..., 6.n.
  • Tuning to the required overall sum of parasitic capacitances and parasitic inductances of the capacitor 5a and the inductors 6.1, ..., 6.n can be realized by suitable configuration and structure of the electric conductors, for example conductive line 2 and/or the conductive lines of the printed circuit board (PCB) of the RF apparatus and/or terminal connections of said components, to create the desired resonances at the second and third harmonic frequencies.
  • PCB printed circuit board
  • Figure 3 shows a second embodiment of the invention which is similar to the first embodiment of Figure 2, and the same reference numbers are used to designate components which are identical or similar to those in Figure 2.
  • the circuit of the RF apparatus of Figure 3 comprises a plurality of inductors 6.1, ..., 6.n, wherein a first terminal of each inductor is connected to a respective antenna connector 3.1, ..., 3.n, as in Figure 2, and a second terminal of each inductor is connected to a second terminal of a respective switch 8.1, ..., 8.n, wherein the first terminal of each of the switches is connected to line 2.
  • each of the antenna connectors 3.1, ..., 3.n is coupled to line 2 via a respective inductor 6.1, ..., 6.n and a respective switch 8.1, ..., 8.n.
  • the antenna switches can be realized by simple mechanical or electronic switches as shown in EP 0 718 981 A2 , for example.
  • the antenna 4 having impedance Z0 (for example 50 ohms) is coupled via inductor L21 (shown as inductor 6.1) to closed switch 8.1 (switches 8.2, ..., 8.n are open).
  • inductor L21 shown as inductor 6.1
  • closed switch 8.1 switches 8.2, ..., 8.n are open.
  • the discrete components 5a, 5b and 6.1, ..., 6.n are selected with the appropriate parasitic elements in addition to parasitic inductance/capacitance of the printed wiring board as follows:
  • the switches 8.1, ..., 8.n may simultaneously perform the function of the inductors 6.1, ..., 6.n, or in other words, the components 6.1, ..., 6.n having inductances L21, ..., L2n may simultaneously perform the function of switches.
  • the inductors/components 6.1, ..., 6.n may be selected by mounting a bridge element (not shown) as switch on the printed circuit board, which is often a broadband coupling capacitor.
  • the switches 8.1, ..., 8.n can directly be replaced by the inductors as depicted in Figure 2.
  • the inductors L21, ..., L2n may for example consist of lumped components for surface mount or bond wires with appropriate dimensions.
  • the described discrete inductor/capacitor topology of the present invention takes advantage of parasitic reactances of the components to reduce the number of components.
  • the discrete inductors 6.1, ..., 6.n can be omitted as the antenna switches 8.1, ..., 8.n and/or the electric switch contacts thereof are used as the required inductances.
  • the space and costs are reduced when the inductors 6.1, ..., 6.n are used as switch contacts, and the remaining components are sufficient to provide a bandpass-filter for the fundamental power, suppression means for the second harmonic, and suppression means for the third harmonic.
  • an ISM (Industrial, Scientific and Medical) band transceiver as shown in Figure 2 is operated at a frequency of 2,45 GHz.
  • the surface mounted circuit of Figure 2 can be configured for one of two different antenna connectors/terminals 3.1 and 3.2, depending on whether L21 or L22 is inserted.
  • the components are a chip capacitor C1 and surface mounted multilayer inductors L1, L21 and L22.
  • the parallel resonance of C1 and L1 occurs at appr. 2,45 GHz.
  • the series resonance of C1 occurs at appr. 4,9 GHz.
  • the parallel resonance of L21 (L22) occurs at appr. 7,35 GHz.

Landscapes

  • Transceivers (AREA)
EP20060022820 2006-11-02 2006-11-02 Circuit de commutation d'antenne avec un filtre passe-bande et suppression des harmoniques Not-in-force EP1919027B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20060022820 EP1919027B1 (fr) 2006-11-02 2006-11-02 Circuit de commutation d'antenne avec un filtre passe-bande et suppression des harmoniques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20060022820 EP1919027B1 (fr) 2006-11-02 2006-11-02 Circuit de commutation d'antenne avec un filtre passe-bande et suppression des harmoniques

Publications (2)

Publication Number Publication Date
EP1919027A1 true EP1919027A1 (fr) 2008-05-07
EP1919027B1 EP1919027B1 (fr) 2012-04-04

Family

ID=37882347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060022820 Not-in-force EP1919027B1 (fr) 2006-11-02 2006-11-02 Circuit de commutation d'antenne avec un filtre passe-bande et suppression des harmoniques

Country Status (1)

Country Link
EP (1) EP1919027B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140246916A1 (en) * 2013-03-01 2014-09-04 Qualcomm Incorporated Active and adaptive field cancellation for wireless power systems
KR101479962B1 (ko) * 2013-04-26 2015-01-08 주식회사 아이.티.에프 대역 가변형 필터 장치 및 이동통신 중계기
CN112204814A (zh) * 2018-06-29 2021-01-08 谷歌有限责任公司 具有镀覆在高电容率壳体材料上的天线的可穿戴设备
CN113471697A (zh) * 2020-03-31 2021-10-01 昇佳电子股份有限公司 一种天线与近接感测电路的传输架构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108183331B (zh) * 2017-12-14 2020-12-01 Oppo广东移动通信有限公司 天线调谐电路、天线装置以及移动终端

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2293277A (en) 1994-09-16 1996-03-20 Motorola Inc Antenna structure and a radio communication device incorporating same
EP0932216A1 (fr) 1998-01-22 1999-07-28 Murata Manufacturing Co., Ltd. Unité composite à haute fréquence
US20020044092A1 (en) * 2000-08-24 2002-04-18 Yuichi Kushihi Antenna device and radio equipment having the same
US7053845B1 (en) 2003-01-10 2006-05-30 Comant Industries, Inc. Combination aircraft antenna assemblies

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2293277A (en) 1994-09-16 1996-03-20 Motorola Inc Antenna structure and a radio communication device incorporating same
EP0932216A1 (fr) 1998-01-22 1999-07-28 Murata Manufacturing Co., Ltd. Unité composite à haute fréquence
US20020044092A1 (en) * 2000-08-24 2002-04-18 Yuichi Kushihi Antenna device and radio equipment having the same
US7053845B1 (en) 2003-01-10 2006-05-30 Comant Industries, Inc. Combination aircraft antenna assemblies

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140246916A1 (en) * 2013-03-01 2014-09-04 Qualcomm Incorporated Active and adaptive field cancellation for wireless power systems
US9819228B2 (en) * 2013-03-01 2017-11-14 Qualcomm Incorporated Active and adaptive field cancellation for wireless power systems
KR101479962B1 (ko) * 2013-04-26 2015-01-08 주식회사 아이.티.에프 대역 가변형 필터 장치 및 이동통신 중계기
CN112204814A (zh) * 2018-06-29 2021-01-08 谷歌有限责任公司 具有镀覆在高电容率壳体材料上的天线的可穿戴设备
CN113471697A (zh) * 2020-03-31 2021-10-01 昇佳电子股份有限公司 一种天线与近接感测电路的传输架构
CN113471697B (zh) * 2020-03-31 2023-12-15 昇佳电子股份有限公司 天线与近接感测电路的传输架构

Also Published As

Publication number Publication date
EP1919027B1 (fr) 2012-04-04

Similar Documents

Publication Publication Date Title
EP1362388B1 (fr) Antenne a plaque et a composants reactifs commutables destinee a l'usage a frequence multiple dans les communications mobiles
JP5262413B2 (ja) マルチバンドデュプレクサモジュール
JP4531399B2 (ja) 送信及び／又は受信モジュール
EP1261143A1 (fr) Circuit d'entrée pour un émetteur-récepteur
US8681062B2 (en) Antenna, wireless communication apparatus and method of configuring antenna
US10263315B2 (en) Directional coupler and communication module
EP1719207A2 (fr) Antenne
US20050037800A1 (en) Front end module for mobile telecommunication system
EP1919027B1 (fr) Circuit de commutation d'antenne avec un filtre passe-bande et suppression des harmoniques
US6693593B1 (en) High frequency circuit with a connection for a printed antenna
EP1430612B1 (fr) Commutateur de signal rf pour un dispositif de communication sans fil
KR20070110957A (ko) 프론트 앤드 모듈
US20060058000A1 (en) Integrated radio frequency module
US10868518B2 (en) Elastic wave device
CN102187572B (zh) Lc滤波器及高频开关模块
KR100737073B1 (ko) Ｒｆ통신모듈의 기판 구조
KR20090000380A (ko) 프론트 앤드 모듈 및 그 제조 방법
CN110366821B (zh) 陷波滤波器以及滤波器电路
US20230199942A1 (en) Filter module, filter element, and electronic device
JP2010081310A (ja) 無線通信モジュール用基板およびそれを用いた無線通信モジュール
CN118285024A (zh) 天线模块
KR20050053829A (ko) 듀얼 밴드 프론트 엔드 모듈
JP2005136888A (ja) 高周波分波回路、それを搭載した高周波部品、高周波モジュール及び無線通信機器
KR100550539B1 (ko) 표면탄성파 듀플렉서 및 그 제조 방법
CN117639803A (zh) 高频模块以及通信装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

17P Request for examination filed

Effective date: 20080804

17Q First examination report despatched

Effective date: 20080904

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: PANASONIC CORPORATION

AKX Designation fees paid

Designated state(s): DE FR GB

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602006028574

Country of ref document: DE

Effective date: 20120531

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20130107

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602006028574

Country of ref document: DE

Effective date: 20130107

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20141119

Year of fee payment: 9

Ref country code: FR

Payment date: 20141119

Year of fee payment: 9

Ref country code: GB

Payment date: 20141119

Year of fee payment: 9

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602006028574

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20151102

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20160729

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160601

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151102

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151130