Enhanced Gain and Compact Size Microstrip Patch Antenna by Suppressing the Surface Waves

Abstract

In this paper, an enhanced gain and compact size microstrippatch antenna by suppressing the surface waves is presented for L band and S band applications. The surface waves are suppressed by using a heterogeneoussubstrate.Aheterogeneoussubstrateispreparedbyremoving partially the substrate surrounding the patch. The suggested antenna works for a dual bandresonance frequencies. The first resonance frequency of the antenna is 1.585 GHz with a return loss of -17.942 dB and the second resonance frequency of the antenna is 2.335GHz with -13.7785 dB return loss. The-10dBimpedancebandwidthoftheantennais11.9MHz(1.5809-1.5928 GHz) and 44.8 MHz (2.324 – 2.3469 GHz), which is the suitable bandwidth forGlobal Positioning Systems (GPS), WLAN and Satellite communication. Compared to a standard patch antenna the suggested antenna has obtained a high gain of 7.99 dBi with reduced size up to 34% by a defected ground structure(DGS)onaheterogeneoussubstrate.UsingHFSS,theperformance of patch antenna with DGS on a heterogeneous substrate are compared with a homogeneous substrate, a homogeneous substrate with DGS and without DGS on a heterogeneoussubstrate.