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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2011-06-16
Miniaturization of Broadband 3-DB Branch-Line Coupler
By
Jun Zhu,

    Dr. Jun Zhu

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Yonggang Zhou,

    Dr. Yonggang Zhou

    State Key Laboratory of Millimeter Waves

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Jianhua Liu

    Dr. Jianhua Liu

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 24, 169-176, 2011
doi:10.2528/PIERL11051706 | Google Scholar

Abstract
In this letter, a new miniaturized broadband 3-dB branch-line coupler at the center frequency of 880 MHz is proposed. The proposed coupler is designed by means of integrated miniaturization method, which consists of shunt capacitors, fractal geometry and equivalent miniaturized stubs, to achieve 82% size reduction compared with the referenced coupler. The return loss and isolation are both under -20 dB over a 19% relative bandwidth. The proposed coupler is simulated, fabricated and measured. The measured results agree well with the simulated ones.
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Citation
Jun Zhu, Yonggang Zhou, and Jianhua Liu, "Miniaturization of Broadband 3-DB Branch-Line Coupler," Progress In Electromagnetics Research Letters, Vol. 24, 169-176, 2011.
doi:10.2528/PIERL11051706
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