Open AccessHigh Selectivity Cascaded Quadruplet Bandpass Filter with Three Pairs of Transmission Zeros
Author(s) -
Chen Jianfeng,
Chen Fuchang,
Li Runshuo,
Xie Zeming,
Chu Qingxin
Publication year - 2017
Publication title -
chinese journal of electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.267
H-Index - 25
eISSN - 2075-5597
pISSN - 1022-4653
DOI - 10.1049/cje.2017.07.017
Subject(s) - band pass filter , selectivity , transmission (telecommunications) , filter (signal processing) , computer science , mathematics , physics , chemistry , computer vision , telecommunications , optics , biochemistry , catalysis
A novel microstrip Cascaded quadruplet (CQ) bandpass filter using quarter wavelength resonators and three‐quarter wavelength resonators is proposed. Based on cross coupling and source‐load coupling, three pairs of finite transmission zeros are generated at the stopband. As a result, the out‐of‐band rejection can be enhanced and high selectivity is achieved. Based on the proposed structure, a cascaded quadruplet filter centering at 3.0GHz is designed and fabricated. Good agreement between the measured and simulated data is obtained.