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2015-03-19
A Compact Uniplanar Rat-Race Coupler with Arbitrary Power Division Ratio and Harmonics Suppression
By
Qing He,

    Dr. Qing He

    School of Electronic Engineering

    Beijing University of Posts and Telecommunications

    China

    Homepage

Yinghong Wen,

    Dr. Yinghong Wen

    School of Electronic and Information Engineering

    Beijing Jiaotong University

    China

    Homepage

Song Chen,

    Dr. Song Chen

    School of Electronic and Information Engineering

    Beijing Jiaotong University

    China

    Homepage

Kai Wang

    Dr. Kai Wang

    The Military Deputy Office of the Second Artillery

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 52, 71-78, 2015
doi:10.2528/PIERL15011604 | Google Scholar

Abstract
In this paper, a miniaturized planar rat-race coupler is proposed to achieve arbitrary power division ratio and harmonic suppression performance simultaneously. It consists of six enhanced T-shaped line sections. The T-shaped lines can be equivalent to arbitrary electrical length lines rather than the conventional λ/4 lines. The explicit design formulas are derived and the characteristic impedances variations with the freedom variable are discussed. Simulated and experimental results show the harmonic suppression to be over -35 dB, while maintaining the conventional performance at the fundamental frequency. The circuit area of the prototype is only 30.8% of the conventional coupler.
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Citation
Qing He, Yinghong Wen, Song Chen, and Kai Wang, "A Compact Uniplanar Rat-Race Coupler with Arbitrary Power Division Ratio and Harmonics Suppression," Progress In Electromagnetics Research Letters, Vol. 52, 71-78, 2015.
doi:10.2528/PIERL15011604
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