EP0685936A2
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EP
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Adaptive antenna matching
Assignee: Nokia Oyj
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Filing: 1995-05-22
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Granted: —
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Expires: 2015-05-22
Abstract
Abstract In a mobile radio telephone, an adaptive impedance matching circuit (25) is positioned between a transmitting power amplifier (24) and a duplexer (18). The adaptive matching circuit (25) matches an antenna (17) to associated electronic circuitry, thereby optimising power transfer in an effort to maintain communication with a base station and to minimise power dissipation within the device itself. An adaptation algorithm is selected and implemented during idle periods when a reflection coefficient is identified as being large. The reactance of a passive pi network is incrementally modified and settings which achieve an optimum match are stored for subsequent use.
Inventors
- 👤 Peter Sroka
- 👤 John Anthony Samuels
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 21:07
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/40; H03H11/00; H03H11/02; H03H11/28; H03H11/30; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04B1/0458
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
46 words
An adaptive antenna matching network in which the impedance of said matching network is adjusted in response to the operating environment of the antenna comprising means for directly measuring the level of reflected signals and means responsive thereto for adjusting the impedance of the matching network.
Claim 2
Dependent Claim
24 words
An adaptive antenna matching network according to claim 1, wherein said matching network is also adjusted in response to the level of transmitted signals.
Claim 3
Dependent Claim
28 words
An adaptive antenna matching network according to claim 1, wherein said matching network is also adjusted in response to a direct measurement of the level of transmitted signals.
Claim 4
Dependent Claim
36 words
A matching network according to claims 2 or 3, wherein said matching network is adjusted in response to the level of a reflection coefficient, calculated by dividing said reflected signal level by said transmitted signal level.
Claim 5
Dependent Claim
28 words
An adaptive antenna matching network according to any preceding claim wherein the means for adjusting is responsive to an indication that the reflected signals meet predetermined level criteria.
Claim 6
Dependent Claim
49 words
An adaptive antenna matching network according to claim 5 wherein the means for adjusting comprises means for comparing the impedance match obtained on adjustment with a previously recorded best impedance match, if the adjusted impedance match is better, the recorded best impedance match is replaced with the adjusted match.
Claim 7
Dependent Claim
22 words
An adaptive antenna matching network according to claim 6 wherein the impedance match reverts to the recorded best impedance match between adjustments.
Claim 8
Dependent Claim
18 words
A network according to any preceding claim, wherein said level of reflected signal is measured by coupling means.
Claim 9
Dependent Claim
19 words
A network according to any preceding claim, wherein reflected signals are reflected from an antenna back towards transmitting circuitry.
Claim 10
Dependent Claim
17 words
A network according to claim 9, wherein said transmitting circuitry forms part of a mobile radio telephone.
Claim 11
Dependent Claim
20 words
A network according to claim 9, wherein said transmitting circuitry forms part of a booster for a mobile radio telephone.
Claim 12
Dependent Claim
16 words
A matching network according to any preceding claim, wherein said circuit includes passive variable reactive components.
Claim 13
Dependent Claim
19 words
A matching circuit according to claim 12, wherein said components are configured as a pi or a Tee network.
References Cited (Backward Citations)
WO1988005214A1
Cited
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