Method and device for measuring the return loss of a radiofrequency signal
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United States of America Patent
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Feb 22, 2000
Grant Date -
N/A
app pub date -
Jan 15, 1997
filing date -
Jan 17, 1996
priority date (Note) -
Expired
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Abstract
A method and device for measuring the return loss of a radiofrequency signal at a feeding circuit coupled to a load, wherein the forward power and the reflected power are sensed by a measuring circuit having first and second branches (11, 12) for transferring a derived forward signal and a derived reflected signal, respectively. The return loss is calculated on the basis of the sensed power levels (P1, P2) of the derived signals in the first and second branches. The sensing range of power levels (P2) to be sensed in one branch (12) is adjusted in response to the sensed power level (P1) in the other branch (11), whereby the dynamic range required for power sensing in the measuring circuit is reduced.
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