Performance Enhancement of Inverted Suspended Circular Polarized Antenna with the Integration of Metasurfaces (MS) Structure Technique

In this paper, it is proposed to use metasurface (MS) structure for the miniaturization and antenna performance enhancement of inverted suspended circular patch with square slot. The antenna was designed based on inverted suspended circular patch with air gap between the patch substrate and copper ground plane is separated with distance of 10 mm (Design A). L-probe technique is used for the antenna design and by using Design A the MS structure is put at the top of the antenna with air gap separation of 1 mm (Design B). The proposed antenna had been designed and simulated by using Computer Simulation Technology (CST) Software. Target application for this antenna design is for Wireless Local Area Network (WLAN) at operating frequency of 2.4 GHz. Simulation and measurement antenna performances in term of return loss, resonant frequency, bandwidth, realized gain, directivity, axial ratio, total efficiency and radiation pattern at the design frequency are investigated and discussed. Based on the result, with the integration of MS, Design B antenna substrate size can be reduced by 23.45 %, yet maintaining the similar performance. Other than that, axial ratio bandwidth (ARBW) for Design B also increases up to 68.8 % from 58.4% (Design A) with impedance bandwidth 627 MHz which is 71 MHz wider than Design A.