Open AccessNovel Diplexer with Improved Isolation Using Asymmetric Transmission Zeros Technique
Author(s) -
Chen Fuchang,
Hu Haotao,
Qiu Jieming,
Guo Mofei,
Chu Qingxin
Publication year - 2016
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.2016.05.028
Subject(s) - diplexer , resonator , isolation (microbiology) , transmission (telecommunications) , coupling (piping) , topology (electrical circuits) , wavelength , matching (statistics) , computer science , reduction (mathematics) , physics , electronic engineering , telecommunications , optics , materials science , mathematics , electrical engineering , engineering , geometry , statistics , microbiology and biotechnology , metallurgy , biology
High isolation and compact size diplexer with two cascaded triplet sections is presented in this paper. By using the quarter‐wavelength resonators and stepped impedance resonator to form cascaded triplets, size reduction is achieved. By exploiting different coupling between the resonators, multiple transmission zeros can be obtained to improved the isolation between the two channels. An experimental diplexer with lower and upper channels centered at 1.8GHz and 2.2GHz is designed to verify the proposed theory. Without extra matching network, the proposed diplexer shows high isolation of greater than 41dB.