Adaptive antenna matching
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United States of America Patent
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-
Jul 7, 1998
Issued Date -
N/A
app pub date -
Dec 26, 1996
filing date -
May 25, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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