Compact UWB Bandpass Filter with Notched Band

A compact ultra-wideband (UWB) band-pass filter (BPF) with highly rejected notched band is proposed in this paper. The proposed UWB BPF is composed of two cascaded interdigital hairpin resonator units. Interdigital hairpin resonator unit with different coupling is theoretically analyzed. The working frequency of the proposed UWB BPF is 3.1-10.6 GHz and notched band is 5.7-5.8 GHz. Finally, measured results are presented, which are in good agreement with the simulation results.