EP0210746A2
Expired / Lapsed
EP
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Impedance matching arrangement
Assignee: BAE Systems Electronics Ltd
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Filing: 1986-06-24
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Granted: —
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Expires: 2006-06-24
Abstract
Abstract An impedance matching arrangement is suitable for use with a frequency hopping radio communications system which is operable over a wide frequency band, so as to match the operating impedance of the antenna (5) at each of the frequencies used. As the frequency of the radio system hops from one frequency to another, a note of any impedance mismatch is noted and data derived therefrom is stored for future use when that frequency is next selected so as to reduce any impedance mismatch.
Inventors
- 👤 Malcolm John Deacon
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 02:34
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04B1/0458; H03; H03H; H03H7/00; H03H7/38; H03H7/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
An impedance matching arrangement including variable frequency means operative in a mode in which certain frequencies occur repetitively coupled to a frequency dependent impedance; impedance compensation means adapted to present to said variable frequency means compensation for the impedance variation of said frequency dependent impedance; and means responsive to an impedance mismatch at a particular frequency for controlling the characteristics of said impedance compensation means when said particular frequency recurs so as to reduce said mismatch.
Claim 2
Dependent Claim
76 words
An impedance matching arrangement including variable frequency means operative in a mode in which certain frequencies occur repetitively coupled to a frequency dependent impedance; impedance compensation means adapted to present to said variable frequency means compensation for the impedance variation of said frequency dependent impedance; and means responsive to an impedance mismatch at a particular frequency for controlling the characteristics of said impedance compensation means when said particular frequency recurs so as to reduce said mismatch.
Claim 3
Dependent Claim
18 words
An arrangement as claimed in claim 1 in which the frequency dependent impedance is constituted by an antenna.
Claim 4
Dependent Claim
20 words
An arrangement as claimed in claim 2 in which the arrangement forms part of a frequency hopping radio communication system.
Claim 5
Dependent Claim
73 words
An arrangement as claimed in claim 3 and wherein the impedance compensation means is positioned between the variable frequency means of the transmitter or receiver and the antenna, and a discriminator is arranged to monitor the characteristics of a signal so as to determine whether its voltage standing wave ratio (VSWR) is within acceptable limits or not during the period of time that the variable frequency means is tuned to a particular frequency.
Claim 6
Dependent Claim
29 words
An arrangment as claimed in claim 4 and wherein the results of said monitoring are entered into a store for subsequent use when the same frequency is next required.
Claim 7
Dependent Claim
44 words
An arrangement as claimed in claim 5 and wherein the stored results are read out of the store during the frequency hop which precedes the hop at which the related frequency recurs so that the results are available to adjust said impedance compensation means.
Claim 8
Dependent Claim
29 words
An arrangement as claimed in claim 5 or 6 and wherein a back-up memory is provided to give long term storage of said results, or of data derived therefrom.
References Cited (Backward Citations)
No citation records indexed.
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