volume | PIER Journals

Abstract

In this paper, a proposed design features a single-fed broadband circularly polarized antenna based on a rotating metasurface. The antenna is positioned between a rotating 4 × 4 periodic patch and the ground plane. The antenna comprises a driving patch and a parasitic patch. It utilizes the two modes of the driving patch, which exhibit different polarizations along the two directions. When the metasurface is placed on it, the truncation angle of the metasurface cells causes the excitation of the two modes with left-rotating circular polarization (CP) and right-rotating CP, respectively. To weaken the right-handed CP relative to the left-handed CP, effectively enhancing the latter, another angle is truncated on the metasurface cell, and the metasurface is rotated by an angle. The final antenna was fabricated and tested with an overall size of 32 × 32 × 3 mm³. Measurements indicate that the |S₁₁| < -10 dB bandwidth ranges from 4.72 to 7.67 GHz (47.9%), and the 3 dB axial ratio (AR) bandwidth ranges from 4.97 to 6.48 GHz (26.3%). Additionally, it achieves a peak gain of 7.75 dBi.

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Dr. Xin Qu

Dr. Rongxian Bai

Dr. Peng Wang

Professor Minquan Li

Dr. Zufeng Zhang

Dr. Shuang Xiao

Ms. Chen Li

Dr. Guocui Zhu