Abstract
In this paper, a novel high selectivity dual-band microwave bandpass fllter (BPF) using dual-mode and triple-mode resonator is proposed. First, a dual-band fllter comprising two dual-mode single band fllters using common input/out lines is designed. Each single BPF is realized using a stepped-impedance resonator (SIR) with a centrally-loaded shunt open stub. The flrst and second passband can be independently controlled by the two dual-mode resonators, respectively. The proposed fllter also ofiers three transmission zeros (TZs) to improve the selectivity. To further improve the selectivity over high side band of the flrst passband, a novel triple-mode resonator is designed to replace the dual-mode resonator. The basic structure of triple-mode resonator is microstrip-to-coplanar waveguide (CPW) structure. The microstrip structure provides one odd mode and one even mode resonant frequency and the CPW structure can provide another even mode resonant frequency without increasing circuit size. Both simulated and measured results show that the fllters exhibit a good performance, including a small insertion loss, selectivity.
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