Abstract-In this paper, we present a new ultra wideband antenna design with band rejection for UWB applications. A CPW-fed circular patch radiates through a circular aperture, which ensures wideband impedance matching and stable omnidirectional pattern over an UWB frequency range, from 3 GHz to 10.6 GHz. In order to avoid interference with WLAN applications, at 5.8 GHz, the antenna is slightly modified to reject undesired band. A semi-circular slot ring is etched on the circular patch at the notch frequency, which creates an open circuit and avoids impedance matching and current propagation. A prototype was fabricated and measured, and the obtained experimental results agree with simulations and show an omnidirectional azimuth pattern over the entire bandwidth.

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In this article, a new ultra‐wideband (UWB)‐integrated antenna‐filter notched at HiPerLAN 5.8 GHz frequency is presented. This antenna filter system is composed of a rectangular slot fed with a microstrip rectangular patch by coupling effect and cascaded with an UWB interdigital hairpin resonator filter. The proposed components, antenna and filter, are matched with 50 Ω, to allow an easier connection, with no need to add additional matching circuit. To improve the selectivity of the antenna filter system, two wide sections of microstrip line was inserted between the input/output feed lines and the interdigital hairpin resonators of the UWB filter. To validate the proposed concept, a prototype was fabricated and tested. The experimental results are presented and discussed. The obtained results show a good agreement between experimental and full‐wave electromagnetic (EM) simulation results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1298–1302, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25963