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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2018-06-13
Compact Branch-Line Coupler with Harmonic Suppression Based on a Planar Simplified Dual Composite Right/Left-Handed Transmission Line Structure
By
Cheng Wang,

    Dr. Cheng Wang

    Shanghai United Imaging Healthcare Co., Ltd.

    China

    Homepage

Wanchun Tang

    Professor Wanchun Tang

    Department of Communication Engineering

    Nanjing University of Science & Technology

    China

    Homepage

Progress In Electromagnetics Research M, Vol. 69, 127-138, 2018
doi:10.2528/PIERM18022706 | Google Scholar

Abstract
In this paper, a planar simplified dual composite right/left-handed (SD-CRLH) transmission line (TL) structure is proposed and applied to the design of branch-line coupler. The SD-CRLH TL is obtained by a microstrip line with an open-ended stub in spiral form. Since this structure has unusual phase shift characteristics with a transmission zero out of the passband, the branch-line coupler with the planar SD-CRLH TL can achieve both size reduction and harmonic suppression. Such a branch-line coupler operating at 0.915 GHz is investigated and fabricated. The equivalent circuit simulation, full-wave simulation and measurement results agree well with each other. From the results, it is shown that the area of the proposed branch line coupler is reduced by 74% compared to the conventional one while maintaining similar performance, and the second harmonic suppression can be lower than -45 dB.
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Citation
Cheng Wang, and Wanchun Tang, "Compact Branch-Line Coupler with Harmonic Suppression Based on a Planar Simplified Dual Composite Right/Left-Handed Transmission Line Structure," Progress In Electromagnetics Research M, Vol. 69, 127-138, 2018.
doi:10.2528/PIERM18022706
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