Tuning method for automatic antenna couplers
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United States of America Patent
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Jan 9, 1996
Grant Date -
N/A
app pub date -
Jan 7, 1994
filing date -
Jan 7, 1994
priority date (Note) -
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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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