GB1517143A - Arrangement for automatically adjusting an electrical characteristic of a circuit - Google Patents

Arrangement for automatically adjusting an electrical characteristic of a circuit

Info

Publication number
GB1517143A
GB1517143A GB957377A GB957377A GB1517143A GB 1517143 A GB1517143 A GB 1517143A GB 957377 A GB957377 A GB 957377A GB 957377 A GB957377 A GB 957377A GB 1517143 A GB1517143 A GB 1517143A
Authority
GB
United Kingdom
Prior art keywords
counter
circuit
combination
reactances
arrangement
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.)
Expired
Application number
GB957377A
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of GB1517143A publication Critical patent/GB1517143A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks
    • H03H7/40—Automatic matching of load impedance to source impedance

Landscapes

  • Transmitters (AREA)
  • Networks Using Active Elements (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

1517143 Automatic control THOMSON-CSF 7 March 1977 [9 March 1976] 09573/77 Heading G3N [Also in Division H4] In an arrangement for automatically adjusting an electrical characteristic of a circuit, e.g. the impedance of a tunable filter or a matching circuit for an antenna, optimization of the characteristic is obtained by cyclically exploring different combinations of n reactances, memorizing the combination corresponding to the best adjustment, and switching the reactances to this combination on completion of a cycle. As shown, a matching circuit between a transmitter B and an antenna A has its impedances selectively switched by a binary counter 10, a good match being indicated by a low reflected signal supplied to an amplifier 3 by a directional coupler 1. The output V of amplifier 3 is compared at 4 with the output Vr of a ramp generator 6. As long as Vr < V the voltage Vr remains fixed and counter 10 conducts the cyclic exploration. When V < Vr the ramp voltage Vr is decreased while counter 10 is interrupted until Vr < V again. The combination causing the latest interruption is memorized at 8 and at the end of the cycle is fed to counter 10. The optimal combinations for various frequency bands may be stored in a readonly memory 14 controlled by control circuit 15.
GB957377A 1976-03-09 1977-03-07 Arrangement for automatically adjusting an electrical characteristic of a circuit Expired GB1517143A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7606716A FR2344179A1 (en) 1976-03-09 1976-03-09 RADIOELECTRIC DEVICE AND TRANSCEIVER EQUIPPED WITH SUCH A DEVICE

Publications (1)

Publication Number Publication Date
GB1517143A true GB1517143A (en) 1978-07-12

Family

ID=9170169

Family Applications (1)

Application Number Title Priority Date Filing Date
GB957377A Expired GB1517143A (en) 1976-03-09 1977-03-07 Arrangement for automatically adjusting an electrical characteristic of a circuit

Country Status (7)

Country Link
AR (1) AR214196A1 (en)
AU (1) AU505779B2 (en)
BR (1) BR7701427A (en)
DE (1) DE2710283C2 (en)
FR (1) FR2344179A1 (en)
GB (1) GB1517143A (en)
IL (1) IL51560A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289989A (en) * 1994-05-25 1995-12-06 Nokia Mobile Phones Ltd Antenna impedance matching arrangement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4201960A (en) * 1978-05-24 1980-05-06 Motorola, Inc. Method for automatically matching a radio frequency transmitter to an antenna
DE19644339C1 (en) * 1996-10-25 1998-06-10 Bosch Gmbh Robert Device for transforming an antenna impedance

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3794941A (en) * 1972-05-08 1974-02-26 Hughes Aircraft Co Automatic antenna impedance tuner including digital control circuits

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289989A (en) * 1994-05-25 1995-12-06 Nokia Mobile Phones Ltd Antenna impedance matching arrangement
US5778308A (en) * 1994-05-25 1998-07-07 Nokia Mobile Phones Limited Adaptive antenna matching
GB2289989B (en) * 1994-05-25 1999-01-06 Nokia Mobile Phones Ltd Adaptive antenna matching

Also Published As

Publication number Publication date
BR7701427A (en) 1977-11-01
DE2710283A1 (en) 1977-09-15
FR2344179A1 (en) 1977-10-07
FR2344179B1 (en) 1978-08-25
AU2300777A (en) 1978-09-14
AU505779B2 (en) 1979-11-29
DE2710283C2 (en) 1983-11-03
IL51560A (en) 1979-07-25
AR214196A1 (en) 1979-05-15

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)