Adaptive antenna matching

Details Adaptive antenna matching Adaptive antenna matching

1996-12-26

1998-07-07

Vo, Nguyen

Telecommunications

Transmitter

Measuring, testing, or monitoring of transmitter

455126, 333 173, 333 32, H04B 1700

Patent

active

057783080

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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patent: 5361403 (1994-11-01), Dent
patent: 5483680 (1996-01-01), Talbot
patent: 5564086 (1996-10-01), Cygan et al.

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