Open AccessTransversal wideband bandpass filter with a wide stopband and multiple transmission zeros
Author(s) -
Wang LiTian,
Xiong Yang,
Wang ZhiPeng,
Gong Li
Publication year - 2021
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.2019-0465
Subject(s) - stopband , band pass filter , wideband , center frequency , bandwidth (computing) , attenuation , port (circuit theory) , transmission (telecommunications) , topology (electrical circuits) , physics , electronic engineering , acoustics , materials science , electrical engineering , computer science , engineering , telecommunications , optics
Herein, we present a compact transversal bandpass filter (BPF) with an extremely wide upper stopband and multiple transmission zeros (TZ). Three signal transmission paths with shorted stubs and open‐coupled lines allow signal transmission from input port to output port. Two resonant modes can be excited simultaneously and managed easily for bandpass response. Eleven TZs are achieved via transmission path cancelation; an extremely wide upper stopband with an attenuation level better than –12 dB is achieved up to 11.7 f 0 , where f 0 is the center frequency (CF). In addition, bandwidth and CF can be controlled by adjusting electrical lengths. For proof of concept, a wideband BPF centered at 1.04 GHz with 3 dB fractional bandwidths of 49.2% was designed, fabricated, and evaluated. The overall circuit measures 0.045 λ g × 0.117 λ g ; good agreement was observed between the measured and simulated results.