A Broadband Fabry-Perot Cavity Antenna for WLAN and V2V Applications

<p><span>In this paper, a Fabry-Perot cavity (FPC) antenna with a partially reflective surface (PRS) consisting of two dielectric slabs with identical thickness and permittivity to increase the gain with wide bandwidth is presented. The PRS is placed in front of a broadband U-shaped microstrip patch antenna to create an air-filled cavity between the PRS and the ground plane of the antenna structure. The configuration of the two dielectric slabs aims to create a positive phase gradient of the reflection coefficient, which strongly controls the gain bandwidth performance. The proposed PRS was first designed and analyzed using a transmission line model and then verified by a full wave simulation. The measurement results show that the proposed FPC antenna achieves a gain improvement of up to 4 dB </span><span>compared to</span><span> the antenna without the PRS, with a 3-dB gain bandwidth of 15.25% and broadside peak gain of 10.43 dBi. In addition, the measured impedance bandwidth is approximately </span><span>20.25% and </span><span>ranges from </span><span>5.14 to 6.298 GHz, which covers the </span><span>required </span><span>f</span><span>requency band </span><span>of wireless local area network (WLAN) and vehicle-to-vehicle (</span><span>V2V) applications.</span></p>