Directive Dual-Band Fabry–Perot Cavity Antenna for 5G-IoT Near-Ground Communications

摘要

This paper describes the design of a directive low-profile dual-band Fabry-Perot cavity antenna with narrow beamwidth. The antenna is designed for near-ground wireless sensor network operating at the frequency bands of 2.4 GHz and 5.8 GHz, intended for smart agriculture applications. The proposed structure consists of an excited patch radiating element used as a primary feed embedded between two parallel reflectors; a perfect reflector and a bi-layered partially reflecting surface (PRS) consisting of both capacitive and inductive grids. Aiming to reduce and suppress radiation in undesired directions, four metallic walls are added to the lateral sides of the cavity leading to an improvement in directivity. The simulation results demonstrate a high directivity, low secondary lobes level and narrow beamwidth in both elevation and azimuth planes for both frequency bands. These features ensure an optimal performance of an antenna for working in near-ground environments.