EP0724308A3 - Antenna arrangement - Google Patents

Antenna arrangement Download PDF

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Publication number
EP0724308A3
EP0724308A3 EP95120130A EP95120130A EP0724308A3 EP 0724308 A3 EP0724308 A3 EP 0724308A3 EP 95120130 A EP95120130 A EP 95120130A EP 95120130 A EP95120130 A EP 95120130A EP 0724308 A3 EP0724308 A3 EP 0724308A3
Authority
EP
European Patent Office
Prior art keywords
voltage
channel
capacitor
antenna
disabled
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Withdrawn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
EP95120130A
Other languages
German (de)
French (fr)
Other versions
EP0724308A2 (en
Inventor
Thomas Josef Flaxl
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.)
Texas Instruments Deutschland GmbH
Original Assignee
Texas Instruments Deutschland GmbH
Texas Instruments 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 Texas Instruments Deutschland GmbH, Texas Instruments Inc filed Critical Texas Instruments Deutschland GmbH
Publication of EP0724308A2 publication Critical patent/EP0724308A2/en
Publication of EP0724308A3 publication Critical patent/EP0724308A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching

Abstract

A novel multiplex system is disclosed which overcomes the disadvantage of a parasitic diode which occurs upon use of MOS FET switches to switch between channels. A preferred embodiment of the invention is effected by connecting the power MOS FET 18,20 to the antenna 10,12 via a serially connected capacitor 14,16. Thus, in a disabled channel, the serially connected capacitor 14 may be charged up to the peak positive D.C. voltage of the antenna resonator circuit 24 of the enabled channel, via the parasitic diode. The capacitor 14 in the disabled channel is charged via the parasitic diode while a different transmit channel has been selected and when the antenna resonator 24 of that different channel, builds up the antenna resonance voltage. Once the voltage at the antenna resonator 24 is at the maximum, the capacitor 14 in the disabled channel is also charged up to the maximum voltage and therefore, the antenna resonance voltage of the enabled channel minus the stored voltage of the disabled channel capacitor 14 will never be less than zero. In conclusion, because the drain of the FET is held to a positive voltage, and the parasitic diode needs a negative voltage to conduct, the parasitic voltage stops conducting and will not conduct while the capacitor is charged to that positive voltage. Therefore, the FET is blocked to negative voltages.
The disabled MOS FET 18 is also blocked for positive voltages because that is the basic function of the MOS FET switch 18. The parasitic diode is not conducting in this situation, because the diode is reversed biased in this case and therefore needs a negative voltage to conduct.
EP95120130A 1994-12-29 1995-12-20 Antenna arrangement Withdrawn EP0724308A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US36564494A 1994-12-29 1994-12-29
US365644 1994-12-29

Publications (2)

Publication Number Publication Date
EP0724308A2 EP0724308A2 (en) 1996-07-31
EP0724308A3 true EP0724308A3 (en) 1998-10-14

Family

ID=23439726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95120130A Withdrawn EP0724308A3 (en) 1994-12-29 1995-12-20 Antenna arrangement

Country Status (2)

Country Link
EP (1) EP0724308A3 (en)
JP (1) JPH08320376A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8447234B2 (en) 2006-01-18 2013-05-21 Qualcomm Incorporated Method and system for powering an electronic device via a wireless link
US9124120B2 (en) 2007-06-11 2015-09-01 Qualcomm Incorporated Wireless power system and proximity effects
US9130602B2 (en) 2006-01-18 2015-09-08 Qualcomm Incorporated Method and apparatus for delivering energy to an electrical or electronic device via a wireless link
US9601267B2 (en) 2013-07-03 2017-03-21 Qualcomm Incorporated Wireless power transmitter with a plurality of magnetic oscillators

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5729236A (en) * 1995-04-28 1998-03-17 Texas Instruments Incorporated Identification system reader with multiplexed antennas
DE102004058613A1 (en) * 2004-12-04 2006-06-08 Conti Temic Microelectronic Gmbh Transmitting device for a plurality of mutually parallel, independently supplied via a respective supply line antenna
US9774086B2 (en) 2007-03-02 2017-09-26 Qualcomm Incorporated Wireless power apparatus and methods

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0301127A1 (en) * 1987-07-31 1989-02-01 Texas Instruments Deutschland Gmbh Transponder arrangement
US4857893A (en) * 1986-07-18 1989-08-15 Bi Inc. Single chip transponder device
US4987392A (en) * 1988-10-17 1991-01-22 Motorola, Inc. Gallium arsenide antenna switch
EP0496610A2 (en) * 1991-01-23 1992-07-29 Texas Instruments Holland B.V. Interrogating station for identification purposes, with separate transmitting and receiving antennae
GB2279212A (en) * 1993-06-17 1994-12-21 Oki Electric Ind Co Ltd Antenna switching circuit
US5465411A (en) * 1993-06-16 1995-11-07 Nisshin Onpa Co., Ltd. Diversity receiver with switching noise reduction
EP0740262A2 (en) * 1995-04-28 1996-10-30 Texas Instruments Deutschland Gmbh Identification system reader with multiplexed antennas

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4857893A (en) * 1986-07-18 1989-08-15 Bi Inc. Single chip transponder device
EP0301127A1 (en) * 1987-07-31 1989-02-01 Texas Instruments Deutschland Gmbh Transponder arrangement
US4987392A (en) * 1988-10-17 1991-01-22 Motorola, Inc. Gallium arsenide antenna switch
EP0496610A2 (en) * 1991-01-23 1992-07-29 Texas Instruments Holland B.V. Interrogating station for identification purposes, with separate transmitting and receiving antennae
US5465411A (en) * 1993-06-16 1995-11-07 Nisshin Onpa Co., Ltd. Diversity receiver with switching noise reduction
GB2279212A (en) * 1993-06-17 1994-12-21 Oki Electric Ind Co Ltd Antenna switching circuit
EP0740262A2 (en) * 1995-04-28 1996-10-30 Texas Instruments Deutschland Gmbh Identification system reader with multiplexed antennas

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
MIYATSUJI K ET AL: "A GAAS HIGH-POWER RF SINGLE-POLE DOUBLE-THROW SWITCH IC FOR DIGITALMOBILE COMMUNICATION SYSTEM", IEEE INTERNATIONAL SOLID STATE CIRCUITS CONFERENCE, vol. 37, 1 February 1994 (1994-02-01), pages 34/35, 305, XP000507050 *
MOTOKI HIRANO ET AL: "KEYLESS ENTRY SYSTEM WITH RADIO CARD TRANSPONDER", IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 35, no. 2, 1 May 1988 (1988-05-01), pages 208 - 216, XP000096890 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8447234B2 (en) 2006-01-18 2013-05-21 Qualcomm Incorporated Method and system for powering an electronic device via a wireless link
US9130602B2 (en) 2006-01-18 2015-09-08 Qualcomm Incorporated Method and apparatus for delivering energy to an electrical or electronic device via a wireless link
US9124120B2 (en) 2007-06-11 2015-09-01 Qualcomm Incorporated Wireless power system and proximity effects
US9601267B2 (en) 2013-07-03 2017-03-21 Qualcomm Incorporated Wireless power transmitter with a plurality of magnetic oscillators

Also Published As

Publication number Publication date
JPH08320376A (en) 1996-12-03
EP0724308A2 (en) 1996-07-31

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