Broadband microstrip bandpass filters using triple-mode resonator

摘要: A broadband microstrip bandpass filter using a stub-loaded resonator is proposed. The basic block of the proposed triple-mode that consists half-wave and shunt open-circuited stub. parameter study how to control frequencies three modes presented. Two filters have been designed, fabricated tested validate design concept. Design guidelines comparison with previous work are also included. For first filter, from 1.75 3.25 GHz, measured return loss greater than 16 dB insertion less 0.9 dB. maximum group delay variation 0.6 ns. Furthermore, there two transmission zeros at 1.3 3.8 GHz for better cut-off response. second one, 1.6 3.7 14 1 ns, 1.36 4.03 GHz.