A Wide Band EBG Based Microstrip Patch Antenna with Reduced SAR for WiMAX Communication

Abstract

A compact wideband mushroom like Electromagnetic band gap (EBG) structure with slots and “via” is elaborated in this research paper for Specific Absorption Rate (SAR) reduction. The proposed EBG is coupled with a coaxial fed modified square patch antenna that works in 3.5GHz band for Wimax applications. The designed EBG integrated with patch antenna shows significant reduction of 82% in SAR value in CST microwave studio. The EBG unit cell size is 10mm×10mm with size reduction of 2mm from that of conventional mushroom type EBG structure. The percentage bandwidth of slotted patch antenna has enhanced to 4.27% as compared to 2.86% of simple patch antenna. The overall dimensions of patch antenna are 45mm×45mm×1.6mm. A dual band EBG is also presented which covers the 3.5GHz and 5.8GHz bands for Wimax applications with SAR reduction of 51.5% and gain enhancement of 12.8%.