Compact dual-band truncated patch antenna with fractal defected ground structure for wireless applications

摘要

In this paper, a compact, dual-band patch antenna is proposed over Minkowski fractal defected ground structure (DGS) for bandwidth enhancement of global positioning system (GPS) applications. The proposed design combines the truncated dual L-shaped slits cut on diagonal corners of radiating patch and fractal defect on the metallic ground plane. This concept shifts the frequencies to lower bands with improvement in antenna radiation properties. By deploying symmetrical and asymmetrical boundaries to the structure for the fractal DGS on metallic ground plane, improvement in bandwidth and gain are obtained. Compact antenna size is achieved for dual-band GPS frequencies of L-1 (1.575 GHz) and L-2 (1.227 GHz). The measured results for antenna prototype are (1.2-1.245 GHz): L-2 band and (1.51-1.59 GHz): L-1 band for 10 dB return loss bandwidth with better pattern radiation. Gain value with and without DGS is observed for compact antenna overall volume of 0.32 lambda(o) x 0.32 lambda(o) x 0.024 lambda(o).