WO1992000634A1 - Radio avec amplificateur de puissance et modes d'exploitation duplex/semi-duplex - Google Patents

Radio avec amplificateur de puissance et modes d'exploitation duplex/semi-duplex Download PDF

Info

Publication number
WO1992000634A1
WO1992000634A1 PCT/US1991/004005 US9104005W WO9200634A1 WO 1992000634 A1 WO1992000634 A1 WO 1992000634A1 US 9104005 W US9104005 W US 9104005W WO 9200634 A1 WO9200634 A1 WO 9200634A1
Authority
WO
WIPO (PCT)
Prior art keywords
port
receiver
power amplifier
radio
duplexer
Prior art date
Application number
PCT/US1991/004005
Other languages
English (en)
Inventor
Avraham Kopelman
Joseph Bercovitch
Amnon Hazan
Zami Schwartzman
Original Assignee
Motorola, Inc.
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 Motorola, Inc. filed Critical Motorola, Inc.
Publication of WO1992000634A1 publication Critical patent/WO1992000634A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication

Definitions

  • This invention relates generally to the field of duplex radios, and more specifically to duplex radios with RF switching devices allowing for both full duplex mode and half-duplex or "talkaround" mode.
  • Radios use duplexer schemes to allow the transmitter and receiver to share the same antenna. Furthermore, switching schemes are used to prevent the transmitter and receiver from further interfering with each other when required. The arrangement should allow transfer of transmitter power to the antenna, and allow the received signal at the antenna to reach the receiver with minimal attenuation. The switching scheme would facilitate the switching of modes from full duplex to half duplex and visa-versa. But with conventional switching schemes, problems still arise from interference and spurious signals. Therefore, a need exists for a method of using RF power stages that delivers sufficient ⁇ er in a full duplex and a "talkaround" or half-duplex mode and further provides improved performance substantially free from interference and spurious signals. Summary of the Invention
  • a radio having full- duplex and half-duplex capability provides for a power amplifier having an output port, a receiver having an input port, and a duplexer having an antenna port, a transmitter port, and a receiver port.
  • the present invention further comprises a switching means coupled to the power amplifier output port and the receiver input port for selectively either simultaneously coupling the power amplifier output port to the duplexer transmitter port and the receiver input port to the duplexer receiver port for duplex operation, or alternately coupling the amplifier output port to the duplexer receiver port for half-duplex operation.
  • Figure 1 is a partial schematic diagram of a Full Duplex /
  • Figure 2 is a partial schematic diagram of an alternative embodiment of the present invention.
  • Radio 10 includes a power amplifier 12 preferably comprising an exciter 14, a driver 16, and a final power amplifier
  • Radio 10 further includes a receiver 20 having an input port
  • the receiver 20 and power amplifier 12 are coupled to a receiver filter 34 (preferably having a pass band in the 851-870 MHz range or the 935-941 Mhz range) and a transmitter filter 32 (preferably having a passband in the 806-825 MHz range or the 896-902 Mhz Range) respectively.
  • the transmitter filter 32 and the receiver filter 34 are preferably monolithic ceramic block comb-line bandpass filters.
  • the receiver 20 is uncoupled from the receiver filter. Furthermore, the power amplifier 12 couples to the receiver filter 34 and transmits power through the receiver filter.
  • the radio 10 interchangeably switches from full duplex to half-duplex using a switching means 22 which can preferably comprise at least two PIN diode switches represented by the switches 24 and 26.
  • a controller 30 sends at least one control signal to the switching means 22 to direct the mode of operation of the radio 10.
  • the radio 10 In full-duplex operation, the radio 10 is required to talk and listen simultaneously. Therefore, the switch 24 couples the power amplifier stage 12 to the transmitter filter 32 and switch 26 couples the receiver 20 to the receiver filter 34. This allows for the simultaneous coupling of the receiver 20 and the power amplifier stage 12 to an antenna 42 via a duplexer 44.
  • the duplexer connects to the antenna 42 through an antenna port 40.
  • the duplexer having a transmitter port 36, a receiver port 38 and an antenna port 40, typically connects to the transmitter filter and receiver filter via fixed length microstrip lines 41 and 43 at the duplexer's transmitter port 36 and the duplexer's receiver port 38 respectively.
  • the phase shift of the microstrip lines 41 and 43 are designed to convert receiver filter impedance at transmitter frequencies to “open circuits” and receiver filter impedance at receiver frequency to “closed circuits.”
  • the transmitter filter impedance at receiver frequencies are seen as “open circuits” while the transmitter impedance at transmitter frequencies are seen as “closed circuits.”
  • both filters "see” only the antenna at their pass band frequencies, and are practically disconnected at their stop band frequencies.
  • the duplexer preferably provides 70 dB isolation between the transmitter signal and the receiver input. This isolation is critical to avoid the receiver's sensitivity degradation due to the transmitter phase noise.
  • the 70 dB isolation between the transmitter power emitting from the power amplifier stage 12 and the receiver's (20) input is accomplished by using several PIN diodes and microstrip transmission lines.
  • the switch 24 uncouples from the transmitter filter 32 and couples to the receiver filter 34 so that transmitter power is delivered to the antenna through the receiver filter 34.
  • Filter 34 attenuates harmonics from the power amplifier and helps reduce costs by avoiding the need for additional low pass filters.
  • Switch 26 isolates the power signal present at the receiver filter's (34) input from the receiver's input (19), thereby avoiding burnout of the receiver 20. At least a single PIN diode switch (26) is used to obtain approximately 20dB isolation.
  • Radio 50 as in radio 10 of Figure 1 , includes a power amplifier 12 which preferably comprises an exciter 14, a driver 16, and a final power amplifier 18. Radio 50 also includes a receiver 20 having an input port 19. During full duplex operation, the receiver 20 and power amplifier 12 are coupled to a receiver filter 34 and transmitter filter 32 respectively. Both filters are preferably monolithic ceramic block combline band pass filters which have the same passband ranges as the filters in radio 10.
  • the power amplifier 12 uncouples from the transmitter filter 32 and couples to another filter 48, which preferably is tuned to eliminate harmonics and typically being a low pass filter.
  • the power amplifier 12 transmits power through the low pass filter during half duplex operation.
  • the low pass filter 48 also attenuates harmonics from the power amplifier.
  • the half- duplex mode allows radio 50 to by-pass both the receiver filter and the transmitter filter (32 and 34.)
  • the radio 50 interchangeably switches from full duplex to half-duplex using a switching means 23 which can preferably comprise at least two PIN diode switches 21 and 25.
  • a controller unit (not shown) can send a control signal or signals to the switching means (23) to direct the mode of operation of the radio 50.
  • the switch 21 couples the power amplifier 12 to the transmitter filter 32.
  • a duplexer 44 having a receiver port 38, a transmitter port 36, and an antenna port 40, couples the transmitter filter 32 to the receiver filter 34.
  • the switch 25 couples the antenna 42 to the antenna port 40 of the duplexer 44.
  • the switch 21 uncouples the power amplifier 12 from the transmitter filter 32 and couples the power amplifier 12 to the low pass filter 48.
  • the switch 25 uncouples the duplexer's (44) antenna port 40 from the antenna 42 and couples the antenna 42 to the low pass filter 48.
  • the transmitter filter 32 and receiver filter 34 "see” only the antenna at their pass band frequencies, and are practically disconnected at their stop band frequencies.
  • the duplexer 44 as in radio 10, preferably provides 70 dB isolation between the transmitter signal and the receiver input. Also, at full-duplex operation, the 70 dB isolation between the transmitter power emitting from the power amplifier 12 and the receiver's (20) input is accomplished by using switching means 23 which may preferably include several PIN diodes and microstrip transmission lines. In half-duplex operation, approximately 20 dB of isolation is obtained using switch 25.
  • an alternative embodiment of the present invention may include a power amplier that includes only an exciter 14 and driver 16 which is connected to switch 21.
  • the Final amplifier 18 is connected to the transmitter filter 32.
  • the switch 21 connects the driver 16 to the final amplifier 18.
  • the switch 21 uncouples the driver 16 from the final amplifier 18 and connects to low-pass filter 48. Otherwise, the alternative embodiment operates similarly to the radio 50 of Figure 2. What is claimed is:

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)

Abstract

Radio (10) possédant des modes d'exploitation duplex et semi-duplex, pourvue d'un amplificateur de puissance (12) comportant une sortie, d'un récepteur (20) comportant une entrée (19), et d'un duplexeur (44) comportant une prise d'antenne (40), une prise d'émetteur (36), et une prise de récepteur (38). On décrit en outre un dispositif de commutation (22) couplé à la sortie de l'amplificateur de puissance (12) et à l'entrée (19) du récepteur pour coupler sélectivement soit simultanément la sortie de l'amplificateur de puissance (12) à la prise d'émetteur (36) du duplexeur et l'entrée (19) du récepteur à la prise de récepteur (38) du duplexeur pour le mode d'exploitation duplex, soit en alternance, la sortie de l'amplificateur (12) à la prise de récepteur (38) du duplexeur pour le mode d'exploitation semi-duplex.
PCT/US1991/004005 1990-06-22 1991-06-07 Radio avec amplificateur de puissance et modes d'exploitation duplex/semi-duplex WO1992000634A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US54233390A 1990-06-22 1990-06-22
US542,333 1990-06-22

Publications (1)

Publication Number Publication Date
WO1992000634A1 true WO1992000634A1 (fr) 1992-01-09

Family

ID=24163367

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/004005 WO1992000634A1 (fr) 1990-06-22 1991-06-07 Radio avec amplificateur de puissance et modes d'exploitation duplex/semi-duplex

Country Status (1)

Country Link
WO (1) WO1992000634A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568942A1 (fr) * 1992-05-05 1993-11-10 Siemens Aktiengesellschaft Commutation émission-réception pour émetteurs-récepteurs à accès multiple et à division de temps
US6014551A (en) * 1996-07-18 2000-01-11 Nokia Mobile Phones Ltd. Arrangement for transmitting and receiving radio frequency signal at two frequency bands
EP1148655A1 (fr) * 2000-04-19 2001-10-24 Infineon Technologies AG Emetteur-récepteur
US6374087B1 (en) * 1997-12-23 2002-04-16 U.S. Philips Corporation Selective peak limiter with a circulator having a third branch having band-pass filter, a threshold element and an adapted load in series
US6697605B1 (en) * 1999-06-09 2004-02-24 Murata Manufacturing Co. Ltd. High-frequency circuit apparatus and communication apparatus
WO2006106378A1 (fr) * 2005-04-07 2006-10-12 Nokia Corporation Terminal a capacite duplex variable

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641365A (en) * 1984-08-23 1987-02-03 Rca Corporation Overpower protection for a radio frequency transceiver
US4644105A (en) * 1985-03-25 1987-02-17 P.T.I., Inc. Mobile telephone controller switch
US4672601A (en) * 1984-12-06 1987-06-09 Motorola, Inc. Duplex interconnect/dispatch trunked radio system
US4712229A (en) * 1986-03-26 1987-12-08 Nec Corporation Multiple access radio telephone system selectively operating on full-duplex and half-duplex modes
US4949335A (en) * 1989-01-23 1990-08-14 Motorola, Inc. A TDM quasi-duplex system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641365A (en) * 1984-08-23 1987-02-03 Rca Corporation Overpower protection for a radio frequency transceiver
US4672601A (en) * 1984-12-06 1987-06-09 Motorola, Inc. Duplex interconnect/dispatch trunked radio system
US4644105A (en) * 1985-03-25 1987-02-17 P.T.I., Inc. Mobile telephone controller switch
US4712229A (en) * 1986-03-26 1987-12-08 Nec Corporation Multiple access radio telephone system selectively operating on full-duplex and half-duplex modes
US4949335A (en) * 1989-01-23 1990-08-14 Motorola, Inc. A TDM quasi-duplex system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568942A1 (fr) * 1992-05-05 1993-11-10 Siemens Aktiengesellschaft Commutation émission-réception pour émetteurs-récepteurs à accès multiple et à division de temps
US6014551A (en) * 1996-07-18 2000-01-11 Nokia Mobile Phones Ltd. Arrangement for transmitting and receiving radio frequency signal at two frequency bands
US6374087B1 (en) * 1997-12-23 2002-04-16 U.S. Philips Corporation Selective peak limiter with a circulator having a third branch having band-pass filter, a threshold element and an adapted load in series
US6697605B1 (en) * 1999-06-09 2004-02-24 Murata Manufacturing Co. Ltd. High-frequency circuit apparatus and communication apparatus
EP1148655A1 (fr) * 2000-04-19 2001-10-24 Infineon Technologies AG Emetteur-récepteur
WO2001082493A1 (fr) * 2000-04-19 2001-11-01 Infineon Technologies Ag Unite d'emission-reception
WO2006106378A1 (fr) * 2005-04-07 2006-10-12 Nokia Corporation Terminal a capacite duplex variable
EP2385742A3 (fr) * 2005-04-07 2013-03-20 Nokia Corp. Terminal doté d'une capacité duplex variable
US8462671B2 (en) 2005-04-07 2013-06-11 Nokia Corporation Terminal having a variable duplex capability

Similar Documents

Publication Publication Date Title
US5387886A (en) Duplex filter operating as a change-over switch
US5386203A (en) Antenna coupler
US7250830B2 (en) Dual band full duplex mobile radio
US6249687B1 (en) Dual mode mobile phone using a multiplex type filter
US4910481A (en) Branching filter
KR100352658B1 (ko) 트랜시버집적회로패키지
US20020176375A1 (en) Filtering method to allow FDD and TDD operations in PCS transreceivers
US4055807A (en) Antenna switch
EP0964477B1 (fr) Dispositif de partage d' antenne pour deux bandes de fréquence
CA2253487A1 (fr) Emetteur-recepteur avec essai en boucle rf et balayage de frequences a liaison descendante
EP0700626A1 (fr) Architecture de radiocommunications a aptitude de selection entre deux sources de frequence
GB2347292A (en) Economical bandpass filter arrangement for a multi-band mobile phone receiver
US6272329B1 (en) Bidirectional frequency translator and full duplex transceiver system employing same
JP2929296B2 (ja) ディジタル式移動電話のアンテナ切替回路
JPH0378329A (ja) 移動体通信設備のｒｆ送受信回路
WO1992000634A1 (fr) Radio avec amplificateur de puissance et modes d'exploitation duplex/semi-duplex
US5335363A (en) Signal interference reduction device and method
KR101234045B1 (ko) 통신 시스템에서 신호 송수신 장치 및 방법
JPH08195695A (ja) アンテナ共用送受信装置
KR100349646B1 (ko) 무선통신 시스템에서의 고조파 성분 억제를 위한 송신전단 장치
TW200425649A (en) Circuit-arrangement for a communication terminal with multi-mode-operation
JPS58200636A (ja) 分岐「ろ」波装置
JPH0584961B2 (fr)
US6191665B1 (en) Coupling circuit to reduce intermodulation distortion in radiofrequency receivers
GB2257335A (en) Antenna switching circuit

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA JP KR

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LU NL SE

NENP Non-entry into the national phase

Ref country code: CA