A compact, ultra‐broadband coplanar‐waveguide bandpass filter with simple open‐ and short‐stub structures

A compact, ultra‐broadband coplanar‐waveguide (CPW) bandpass filter (BPF) is presented. The CPW‐BPF comprises solely open‐ and short‐stub structures. Compared with the conventional broadband CPW‐BPFs, the proposed filter is of a relatively compact configuration. The demonstrated CPW‐BPF has about 110% 3‐dB fractional bandwidth, sharp selectivity, and good stopband rejection.