Tables for pseudoelliptical and phase equalized microwave filters  II
Abstract
Odddegree microwave filters with symmetrical structures and auxiliary couplings between nonadjacent resonators are discussed. These couplings give transmission zeros both at real and complex frequencies. It is shown that if frequencyindependent crosscouplings are properly introduced in the filter lowpass prototype, the resulting transfer function exhibits an odd number of finitefrequency transmission zeros, which are not symmetrically allocated with respect to the zero frequency. The lowpass filter therefore cannot be physically realized, but can still be utilized as a lowpass prototype of the microwave filter. It is shown that an equiripple transfer function can be achieved with an odddegree network, if the resonators are tuned at different frequencies with respect to the filter midband frequency. The element values of the 52 odddegree lowpass prototype networks are collected in six tables, and the amplitude and group delay response behavior for some of them are shown.
 Publication:

Alta Frequenza
 Pub Date:
 June 1982
 Bibcode:
 1982AlFr...51..143P
 Keywords:

 Cross Coupling;
 Equalizers (Circuits);
 Low Pass Filters;
 Microwave Coupling;
 Microwave Filters;
 Network Synthesis;
 Cavity Resonators;
 Frequency Response;
 Phase Shift;
 Prototypes;
 Tables (Data);
 Time Lag;
 Transfer Functions;
 Electronics and Electrical Engineering