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The paper discusses bandwidth enhancement of a microstrip patch antenna. It explores the application of DGS with parasitic elements to obtain a compact UWB multiband antenna. The antenna is designed on a 14*25 mm 2  RT-Duroid (5880) substrate. A comparison is made between four antenna designs with the same dielectric substrate. The antenna design with circular slot on the patch, facilitated with the shorting pins, shows bandwidth enhancement. It uses non-periodic Defective Ground Structure (DGS) for improvement in return loss characteristics, bandwidth enhancement and multiband operation. The slot on the patch provides compact size and DGS gives wide bandwidth (80.5%) with five resonant frequencies of 0.92 GHz, 2.36 GHz, 3.46 GHz, 4.98 GHz &amp; 7.9 GHz making it applicable for GSM (890-966 MHz), WLAN/WiMAX (2.4/3.6/4.9), multi-band applications.

Design of a Circular-Slot Multiband (UWB) Antenna with Non-Periodic DGS for WLAN/WiMAX Applications