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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2022-11-20
Coplanar Series-Fed Spiral Antenna Arrays for Enlarged Axial Ratio Bandwidth
By
Kazuhide Hirose,

    Prof. Kazuhide Hirose

    College of Engineering

    Shibaura Institute of Technology

    Japan

    Homepage

Yuki Tamura,

    Dr. Yuki Tamura

    College of Engineering

    Shibaura Institute of Technology

    Japan

    Homepage

Masaki Tsugane,

    Dr. Masaki Tsugane

    College of Engineering

    Shibaura Institute of Technology

    Japan

    Homepage

Hisamatsu Nakano

    Prof. Hisamatsu Nakano

    Engineering

    Hosei University

    Japan

    Homepage

Progress In Electromagnetics Research Letters, Vol. 108, 1-8, 2023
doi:10.2528/PIERL22100901 | Google Scholar

Abstract
We study two array antennas to expand a 3 dB axial ratio bandwidth. Each array is located at a quarter wavelength above the ground plane and analyzed using the moment method. First, we use paired spiral elements fed by balanced parallel lines to avoid unwanted radiation from the feedline. It is found that the antenna shows an axial ratio bandwidth of 30%. Next, the elements are separated and fed by a single feedline to simplify the feed system. It is revealed that the antenna can radiate a circularly polarized wave under a feedline radiation of less than -16 dB. The frequency responses show that an axial ratio < 3 dB and VSWR < 2 are obtained in a bandwidth of 21%, where the gain is more than 13.3 dBi. The simulated results are verified with experimental ones.
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Citation
Kazuhide Hirose, Yuki Tamura, Masaki Tsugane, and Hisamatsu Nakano, "Coplanar Series-Fed Spiral Antenna Arrays for Enlarged Axial Ratio Bandwidth," Progress In Electromagnetics Research Letters, Vol. 108, 1-8, 2023.
doi:10.2528/PIERL22100901
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