Investigating the effect of arc perturbation on SIW cavity backed slot antenna

Abstract

In this paper, the effect of using square cavity with two arc corners on a SIW cavity backed slot antenna is presented. The arc perturbation technique is used to separate the resonant frequencies of two degenerated modes in a square SIW cavity. The behavior of an individual SIW cavity with 2 different arc corners is discussed. The bandwidth improvement is achieved using an arc perturbation technique in the SIW square cavity compared to conventional SIW cavity backed slot antenna. The simulated results show the impedance bandwidth for reflection coefficient less than −10 dB, is 3%. Furthermore, the presented antenna exhibits good radiation performance of unidirectional pattern, high Gain and FTBR of 5.2 dBi and −27 dB, respectively. Moreover, the proposed antenna benefits from advantages, including compact size, light weight, easy fabrication with low cost and convenient integration with planar circuits.