A compact, ultrawide band planar antenna with modified circular patch and a defective ground plane for multiple applications

摘要

A compact ultrawideband planar antenna with modified circular patch and a defective ground plane for multiple applications is presented. The proposed structure consists of a modified circular patch and rectangular parasitic elements with defective ground plane etched on flame retardant (FR-4) substrate with 50 O feed line. Return loss (S11 < -10 dB) and the simulated bandwidth of the structure was 2.5 to 12.2 GHz with the fractional bandwidth of 131%. The overall volume of the structure had a compact size of 15 x 19 x 1.6 mm3. The gain of the structure is 3.5 dB, and the antenna efficiency is 73.5%. The structure radiated (stable radiations) omnidirectional and bidirectional patterns. Measured and simulated results of Co-and Cross-polarizations. are in relatively good agreement. All these properties shows that the proposed structure is applicable in WiMAX-band 3.5, 5.5 GHz, WLAN-band 5.2, 5.8 GHz, X-band8-12 GHz, data links to satellites along with various applications in the wireless communication field.