Echo Distortion in Bandpass Filters
In communications systems, signal trans-mission performance can be degraded by amplitude and/or differ-ential group delay distor-tion in the usable pass-band of a bandpass filter. Additional degradation, via echo distortion, can occur when long transmission lines are oper-ated between mismatched source and load impedances (1). When bandpass filters use a substantial number of coupled resonators, mismatched source and load impedances can also cause echo distortion. This article pre-sents some quantitative information for a echo distortion in a typical IF bandpass filter usedin satellite communications earth station equipment.
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