volume | PIER Journals

Abstract

A low profile, wideband circularly polarized (CP) antenna using metasurface (MS) is proposed. The proposed antenna is composed of a square loop feeding structure and four driven patches positioned between the ground plane and the MS. Frist, The loop with truncated corners functions as a sequential phase feeder for the four driven patches. These patches are then capacitively coupled by the feeding loop to create a CP mode. Then a defective ground structure (DGS) is adopted to improve the impedance matching. Finally, using MS to generate extra CP minimum AR points to broaden the AR bandwidth. The MS is composed of a 4 × 4 truncated square patch array which enhances the impedance bandwidth and gain of the proposed antenna. The total dimensions of the proposed antenna are 50 mm × 50 mm × 3.124 mm (λ₀ × λ₀ × 0.062λ₀). The MS antenna in circular polarizations achieves a wide -10 dB impedance bandwidth of 37.5% (4.85-7.09 GHz) and a 3 dB axial ratio bandwidth (ARBW) of 20% (5.66-6.92 GHz). In addition, the maximum gain of 10.28 dB is achieved at 6.1 GHz, and the proposed MS antenna also has a flat gain across a broad frequency range from 4.5 GHz to 6.75 GHz.

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Dr. Yongkang Yuan

Professor Minquan Li

Dr. Guocui Zhu

Dr. Xin Qu

Dr. Zhonghui Li