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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2018-12-14
Compact Quad-Channel Diplexer Using Defected Stepped Impedance Resonators
By
Anfu Zhu,

    Dr. Anfu Zhu

    School of Electric Power

    North China University of Water Resources and Electric Power

    China

    Homepage

Haidong Zhou,

    Dr. Haidong Zhou

    Leihua Avionics Institute of AVIC

    China

    Homepage

Jianzhong Chen,

    Dr. Jianzhong Chen

    School of Electric Power

    North China University of Water Resources and Electric Power

    China

    Homepage

Jianxing Li

    Professor Jianxing Li

    School of Information and Communications Engineering

    Xi'an Jiaotong University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 80, 127-133, 2018
doi:10.2528/PIERL18100701 | Google Scholar

Abstract
This paper proposes a new compact quad-channel diplexer (2.45/4.2 GHz and 3.5/5.2 GHz) using defected stepped impedance resonators (DSIRs). The proposed quad-channel diplexer is composed of one common input feeding line, sixteen folded DSIRs, and two output feeding lines. Every four DSIRs are designed to determine passband characteristics of one individual channel, and two passbands are filtered out eventually at each output port. The distributed coupling technique featured by small loading effect is introduced to eliminate the necessity of extra impedance matching networks, which consequently results in a reduced circuit size. A diplexer prototype operated at 2.45/4.2 GHz and 3.5/5.2 GHz bands with measured 3-dB fractional bandwidths of 12.5%, 7.2%, 6.4%, and 5.0% has been implemented, showing a high isolation of larger than 33 dB between the two output ports. Experimental results coincide well with the theoretical predictions and simulation results.
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Citation
Anfu Zhu, Haidong Zhou, Jianzhong Chen, and Jianxing Li, "Compact Quad-Channel Diplexer Using Defected Stepped Impedance Resonators," Progress In Electromagnetics Research Letters, Vol. 80, 127-133, 2018.
doi:10.2528/PIERL18100701
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