Abstract
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, and exhibits sharp attenuations near its passband. The simulation frequency response of the filter shows an insertion loss of 0.8 dB, a return loss of 9.5 dB in the passband and high selectivity in cut-off frequency. Good agreement between the EM simulation and measurement is obtained.
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