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PIER PIER B PIER C PIER M PIER Letters
2011-04-15
A Compact Microstrip Rat-Race Coupler with Modified Lange and T-Shaped Arms
By
Guo-Qing Liu,

    Dr. Guo-Qing Liu

    Shanghai Jiao Tong University

    China

    Homepage

Lin-Sheng Wu,

    Dr. Lin-Sheng Wu

    Department of Electronic Engineering

    Shanghai Jiaotong University

    China

    Homepage

Wen-Yan Yin

    Dr. Wen-Yan Yin

    Zhejiang University

    China

    Homepage

Progress In Electromagnetics Research, Vol. 115, 509-523, 2011
doi:10.2528/PIER11032003
Abstract
A compact microstrip rat-race coupler is proposed with a new phase inverter which is realized by a modified Lange coupling structure with a slotted ground plane and a floating-potential conductor. Based on the evenand odd-mode theory, its parameters are generally synthesized. In order to further miniaturize the rat-race coupler, a T-shaped line is utilized. A prototype operating at 2.0 GHz is designed and fabricated for verification. The circumference of our proposed rat-race coupler is only 0.52λ. Its in-phase and out-of-phase bandwidths are also enhanced, with reasonable agreement obtained between its simulated and measured S-parameters.
Citation
Guo-Qing Liu, Lin-Sheng Wu, and Wen-Yan Yin, "A Compact Microstrip Rat-Race Coupler with Modified Lange and T-Shaped Arms," Progress In Electromagnetics Research, Vol. 115, 509-523, 2011.
doi:10.2528/PIER11032003
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