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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2020-03-06
A Microstrip Lossy Diplexer with Flat Channel Passbands
By
Fan Zhang,

    Dr. Fan Zhang

    School of Physics

    University of Electronic Science and Technology of China

    China

    Homepage

Yun Wu,

    Dr. Yun Wu

    Department of Engineering Science

    University of Greenwich

    U.K.

    Homepage

Liang Sun,

    Dr. Liang Sun

    Institute of Physics, Chinese Academy of Sciences

    China

    Homepage

Yang Gao,

    Dr. Yang Gao

    Department of Information Engineering

    Zhengzhou University

    China

    Homepage

Yi Wang,

    Dr. Yi Wang

    Sch Elec Elec Comp Eng

    Univ Birmingham

    England

    Homepage

Jun Xu

    Dr. Jun Xu

    School of Physics

    University of Electronic Science and Technology of China

    China

    Homepage

Progress In Electromagnetics Research M, Vol. 90, 99-108, 2020
doi:10.2528/PIERM20011605 | Google Scholar

Abstract
Passband flatness and band-edge selectivity in microwave filters with finite quality-factor resonators can be improved by the synthesis of lossy filters. This paper demonstrates the extension of this technique to a lossy diplexer by means of resistive coupling. A dual-mode stub-loaded resonator (SLR) junction and a fork-like feedline are used in the diplexer to address the challenge of independently controlling the external coupling from the common port to the two channel filters and therefore enable flexible realization of the channel bandwidth. The coupling matrices with resistive couplings for the lossy diplexer are generated. For verification, a microstrip lossy diplexer operating at 1.91 and 2.6 GHz was designed and tested. The flatness of the passband has been significantly improved, with a reduction of the passband insertion loss variation from 1.4/1.2 dB to 0.66/0.63 dB for the low/high band. The measured results are in good agreement with the simulations as well as the theoretical responses from the coupling matrix. This was also experimentally compared with a reference diplexer without resistive couplings.
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Citation
Fan Zhang, Yun Wu, Liang Sun, Yang Gao, Yi Wang, and Jun Xu, "A Microstrip Lossy Diplexer with Flat Channel Passbands," Progress In Electromagnetics Research M, Vol. 90, 99-108, 2020.
doi:10.2528/PIERM20011605
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