Influence of Non-ideal Filters on the Transmission Characteristics of Resonant Transfer Switching Systems

This communication analyzes the influence of non-ideal practical filters with finite cutoff slope on the transmission characteristics of general resonant transfer systems. Lowpass-to-lowpass resonant transfer transmission systems have been used in the past
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as means for efficiently implementing time-division switching systems. A basic transmission path in these systems consists of a band-limiting lowpass filter at the input and an interpolation lowpass filter at the output, with two serial switches and a time-divided “highway” interconnecting the filters. The capacitive input impedances of the two filters (see Fig. 1) and the switching path impedances are tuned to resonance, so that each time the switch is closed all energy from the input is transferred to the output. This makes the resonant transfer method of time-division switching practically lossless and independent of the unavoidable distributed switching path inductances and capacitances.