Tuning method for automatic antenna couplers

Details Tuning method for automatic antenna couplers Tuning method for automatic antenna couplers

1994-01-07

1996-01-09

Urban, Edward F.

Telecommunications

Transmitter

With variation of antenna impedance or dimension for modulation

455115, 455125, 455129, 333 171, 333 173, 343860, 343861, H03C 152, H01L 508, H01Q 150

Patent

active

054836808

ABSTRACT:
A method and circuit for detecting and reducing the impedance mismatch between the directional coupler and the antenna of an RF communications system exposed to externally generated RF signals. The impedance mismatch is detected by the quadrature multiplication of the signal passing through a directional coupler in the forward and reverse directions with the detection being enhanced by the use of a forward direction signal substantially devoid of externally generated RF signal components.

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