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Transcript
If the ratio of forward and reversed power measured
by the detector is 30dB, then the directional coupler is
said to have a directivity of 30dB. This value is
common in practice
Other quantity is directional coupling :It is the ratio of forward wave in the main line to the
forward wave in the auxiliary line.
It is measured in decibels, and 20dB (100:1) is a
typical value
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