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This letter designs a microstrip dual-band bandpass filter (BPF) based on hairpin resonators using T junctions I/O structure. Firstly it presents the principle of T junctions based on a diplexer. Secondly, the method of designing single-band BPF based on hairpin resonators is introduced. By using a T junction to connect two single-band BPFs, the influence from each filter is reduced. Then a dual-band...
This paper presents a compact balanced bandpass filter (BPF) with wide stopband. Firstly, it presents the equivalent circuits of the balanced BPF. By utilizing merits of the used resonator and open stubs centrally loaded, a balanced BPF with wide stopband and miniaturization can be achieved. Finally, a microstrip balanced BPF working at 2 GHz is designed and fabricated. Measured results accord well...
Two novel compact ultra-wideband (UWB) bandpass filter is developed by using two kinds of stub-loaded triple-mode resonator doublets. The proposed doublet consists of two parallel but oppositely arranged stub-loaded resonators. An UWB filter is designed by cascading three doublets, and eleven transmission poles are obtained in its passband. The high-orders filter has a passband covering 3.4–10.4 GHz,...
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