A Two Element SIW Cavity Backed Hexagonal Patch Antenna Array

In this paper, a novel, low profile, two elements cavity backed antenna array has made with Substrate Integrated Waveguide (SIW) square cavity which is backed by a hexagonal patch. The integration of a hexagonal patch antenna in a cavity reduces the surface wave effects which eventually increase the radiation efficiency up to 92%. The single designed antenna which is operating at 17GHz with 2.5 GHz bandwidth exhibits a high 20dB front-to-back ratio and good gain during its entire bandwidth. While a proposed two element array maintains advantages over single element to shows 9 dBi average directivity across the bandwidth with 67°half power beam width which was 80° in single element. Antenna shows −30dB isolation due to no linkage of flux among two elements.