A compact high gain printed antenna with frequency selective surface for 5g wideband applications

Abstract

This paper reports on the development of a compact wideband printed antenna radiator with improved gain and directivity by making use of frequency selective surfaces (FSSs). The proposed design is meant to be operated in the n77 and n78 bands of the sub-6 GHz 5G allocated apectrum. In today’s era of advanced technology, compact antennas with high gain and high directivity are required for wireless applications. FSS based spatial filters are attracting the interest of researchers due to their capability to pass only selective radiations while avoiding unwanted frequencies. The composition of architecture equations for designing the band pass FSS using double square loop geometry and printed patch antenna radiator are presented in this article. The geometries of FSS and printed patch antenna radiator (PAR) are designed for operation in targeted n77 and n78 bands in the sub-6 GHz 5G spectrum. The designs of PAR and a double square loop FSS (DSLFSS) are integrated together. The simulations are performed using the ANSYS HFSS software. The prototype is fabricated, and the results are verified using the measuring setup. The fractional bandwith of the antenna is 19.14% with the peak gain of 5.5 dBi gain and peak directivity of 6.2 dBi. The uniqueness of the proposed design lies in the achievement of a compact size, low cost as antenna and DSLFSS are fabricated on the low cost FR4 substrate, high gain, high directivity and wide bandwidth, which make the proposed antenna a good choice for 5G wideband applications.