Coupling bandwidth and Reflected Group Delay Characterization of Microwave Bandpass Filters

摘要

The concept of coupling bandwidths is not new, Dishal [1,2] used it in the 1950s and ' 60s to greatly simplify design procedures for interdigi- tal filters. CBWs can be regarded as another way of expressing the admittance or impedance inverter values (J or K) but have the advantage of being directly and easily measureable in a fil- ter using a Vector network Analyzer (VNA).