A metasurface-based high gain circularly polarized patch antenna with wide global bandwidth

Abstract

This paper introduces a novel metasurface (MS)-based circularly polarized (CP) microstrip patch antenna. Utilizing a square microstrip patch with plus- and diagonal-shaped slots on a 1.6 mm thick FR-4 substrate as the host antenna, the design incorporates a 4 × 4 square array MS on another 1.6 mm thick FR-4 substrate, separated by a 3.4 mm thick Teflon layer. The antenna offers a −10-dB impedance bandwidth from 5.45 to 7.55 GHz and an axial ratio (AR) bandwidth between 6.02 and 6.35 GHz, achieving a maximum realized gain of 6.3 dBic at 6.25 GHz, exhibiting right-handed circular polarization (RHCP). An equivalent circuit model is developed to validate impedance response, and the fabricated antenna closely matches simulated results. With a low profile of $0.42\lambda \mathrm{o}\times 0.42\lambda \mathrm{o}\times 0.033\lambda \mathrm{o}$ at 6.25 GHz, this CP antenna is suitable for applications like satellite communication for their uplinks and WLAN application.

KEYWORDS:

• Patch antenna
• circular polarization
• metasurface
• axial ratio

Acknowledgement

SB acknowledges Science and Research Board, Govt. of India for partial support of the research grant.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Science and Engineering Research Board under grant [CRG/2021/000947].