BIPOLAR DUAL-BAND MPRS-FSS SECTORAL ANTENNA FOR BASE STATION APPLICATIONS

摘要

This article deals specifically with sectoral antennas and focuses on the ability to design a bipolar dual-band structure by combining double layers metallic partially reflective surface (MPRS) working on orthogonal polarizations as a superstrate with a frequency selective surfaces (FSS) as a substrate, thus making it possible to circumvent the narrow bandwidth problem. The use of metallic structures offers a new approach to industrial partners to reduce costs and to facilitate design techniques. This antenna provides vertical and horizontal polarizations with a sectoral radiation pattern presenting a half power beam-width of at least 60° in the azimuth plane. We obtain the different operating frequencies by adjusting the distance of MPRS layers from FSS layer. The proposed structure presents more than 15 dBi directivity enhancement at 4.8 and 5.6 GHz as compared to those of a patch antenna with 8 dB directivity. The geometry and characteristics of the antenna are detailed and a design method is proposed.