Open AccessCompact tri‐wideband bandpass filter with multiple transmission zeros
Author(s) -
Xiong Yang,
Wang LiTian,
Gong Li,
He KaiYong,
Zhang Man,
Li Hui,
Zhao XinJie
Publication year - 2019
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.2018-0220
Subject(s) - passband , band pass filter , stopband , resonator , physics , transition band , wideband , center frequency , electronic engineering , transmission (telecommunications) , elliptic filter , prototype filter , acoustics , topology (electrical circuits) , computer science , optics , engineering , bandwidth (computing) , telecommunications , low pass filter , electrical engineering
This paper presents a tri‐wideband bandpass filter ( TWB ‐ BPF ) with compact size, high band‐to‐band isolation, and multiple transmission zeros ( TZ s). The proposed TWB ‐ BPF is based on a multiple‐mode resonator ( MMR ), which is interpreted by the method of the even‐ and odd‐mode analysis technique. The MMR can excite 11 resonant modes, where the first two modes comprise the first passband, the next four modes form the second passband, and the last five modes are used to generate the third passband. In addition, 10 TZ s are yielded to obtain high band‐to‐band isolation and wide stopband suppression characteristics up to 14.95 f c1 ( f c1 is the center frequency of the first passband). To verify the proposed filter, a TWB ‐ BPF with 3‐ dB fractional bandwidths ( FBW s) of 37.4%, 43.5%, and 40.4% is designed, fabricated, and measured.