Band-notched small square slot antenna for ultra-wideband applications

In this article, a novel printed slot antenna for ultra wideband applications with variable frequency band-notch characteristic is presented.The proposed antenna consists of a modified radiating stub with a pair of L-shaped slits and a ground plane with two T-shaped parasitic structures, which provides a wide usable fractional bandwidth of more than 135% (2.815.1 GHz) while showing the band rejection performance in the frequency band of 5 to 6 GHz. By cutting a pair of L-shaped slits with variable dimensions on the radiating stub frequency band-stop performance is generated and we can control its characteristics such as band-notch frequency and its bandwidth. The designed antenna has a small size of 20 x 20 mm2. Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range. (C) 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:11381143, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26798