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Ultra-wideband small square monopole antenna with variable frequency notch band characteristics using an interdigital slot



In this article, a novel printed monopole antenna for ultra-wideband applications with variable frequency band-notch characteristic is presented.The proposed antenna consists of a square radiating patch with a modified interdigital slot and a ground plane with a pair of inverted L-shaped sleeves which provides a wide usable fractional bandwidth of more than 130% (2.9–14.6 GHz). By cutting a modified interdigital slot with variable dimensions on the radiating patch 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 10 × 16 mm2 while showing the band rejection performance in the frequency band of 5.04–5.96 GHz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2012; View this article online at DOI 10.1002/mop.26488