IMPROVEMENTS IN SUPERCONDUCTING LINEAR-PHASE MICROWAVE DELAY-LINE BANDPASS-FILTERS

Microwave delay line filters can be designed to specified amplitude an d phase characteristics using a synthesis procedure which takes into a ccount multiple reflections and losses in the delay lines. The time do main synthesis procedure has now been extended so that frequency-depen dent loss and delay line dispersion can also be allowed for. Meanwhile experimental results on linear phase microstrip and coplanar filters show significant improvements on stopband attenuation and phase linear ity over previously published data on microstrip devices.