Enhanced gain and compact size microstrip patch antenna by suppressing the surface waves

Abstract

In this paper, an enhanced gain and compact size microstrip patch antenna by suppressing the surface waves is presented for L band and S band applications. The surface waves are suppressed by using a heterogeneous substrate. A heterogeneous substrate is prepared by removing partially the substrate surrounding the patch. He suggested antenna works for a dual band resonance frequency. The first resonance frequency of the antenna is 1.585 GHz with a return loss of -17. 942 dB and second resonance frequency of the antenna is 2.335 GHz with - 13. 7785 dB return loss. The -10 dB impedance bandwidth of the antenna is 11.9 MHz (1.5809 - 1.55928 GHz) and 44.8 MHz (2.324 - 2.3469 GHz), which is the suitable bandwidth for Global 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% of a defected ground structure (DGS) on a a heterogeneous substrate. Using HFSS, the performance 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 heterogeneous substrate.