Enhanced Bandwidth and Gain of a Patch Antenna Using Metasurface

In this paper, a bandwidth and gain enhanced antenna realized by nonuniform metasurface was proposed. Firstly, a slotted patch with corner-cut was employed as the initial antenna. Then, to further enhance the radiated properties, squared corner-cut patches were arranged around the initial antenna, forming nonuniform metasurface. As simulations demonstrated, compared with the initial antenna, two additional resonant frequencies are generated, resulting in a wide S 11 bandwidth ranging $4.45-6.5 \mathrm{GHz}$. Moreover, the axial ratio values broke the 3 dB line to a ranged bandwidth of $4.85-5.3 \mathrm{GHz}$, and the gain has an averaged 3dB improvement, which the peak gain reaches 11.3dBic. Moreover, the radiation pattern exhibits a low cross-polarization of less than 25 dB, occurred at 5.05 GHz. Finally, through the simulated verification, the novel design utilized the non-uniform metasurface achieved the bandwidth and gain significantly enhanced, providing a novel approach to the radiation properties enhancement. The proposed antenna can also apply to the civilian communication, point-to-point communication, and the radar system, owing to its excellent properties.

I. Introduction

CP antennas, which are capable of reducing multi-path effects and polarization mismatch, are vital in wireless communication systems and point-to-point links. The demand for CP antennas with high gain, wideband coverage, and a wide 3dB axial ratio (ARBW) angle has led to the exploration of different design techniques. One such technique that has proven successful is the use of metasurfaces, which effectively create and enhance CP radiation. Consequently, numerous antennas incorporating metasurfaces have been developed and demonstrated to exhibit wideband CP properties [1–3].