A low-profile ultra-wideband circularly polarized antenna array with metasurface

Wei He, Yejun He*, Sai Wai Wong, Long Zhang, Wenting Li, Haixia Cui, Amir Boag

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this article, a low-profile ultra-wideband (UWB) circularly polarized (CP) antenna array with metasurface is presented. The antenna array consists of a 2 × 2 polarization conversion metasurfaces (PCMs) and a sequential feeding network. The PCM is composed of 4 × 4 polarization conversion unit-cells. The unit-cell is obtained by putting an ellipse patch into a rectangular ring, connecting the ellipse and the ring with two stubs, and then rotating it by 45°. A linear polarization (LP) slot antenna with a PCM can achieve a CP antenna, which has an impedance bandwidth of about 33.8% (5.4-7.6 GHz) of |S11| < −10 dB and a 3-dB axial ratio (AR) bandwidth of about 24.8% (5.8-7.3 GHz), respectively. The UWB CP characteristics can be achieved when a UWB sequential feeding network is added to the 2 × 2 PCMs. Simulated and measured results show that the proposed antenna array has an impedance bandwidth of about 117% (1.75-6.75 GHz) of |S11| < −10 dB and a 3-dB axial ratio (AR) bandwidth of about 105.7% (2.24-7.35 GHz), respectively. The usable bandwidth can reach 100.3% (2.24-6.75 GHz). Besides, the proposed antenna array achieves a higher gain compared to the traditional slot array and the peak gain of 12.5 dBic at 6 GHz. The overall size of the antenna is 0.6λ × 0.6λ × 0.03λ (λ refers to the wavelength of the lowest operating frequency in free space). The proposed antenna array can be widely applied to various wireless communication systems.

Original languageEnglish
Article numbere22874
JournalInternational Journal of RF and Microwave Computer-Aided Engineering
Volume31
Issue number12
DOIs
StatePublished - Dec 2021

Keywords

  • circularly polarized antenna
  • metasurface
  • ultra-wideband antenna

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