Fan‐shaped antenna with triband‐notched characteristic for UWB applications

Abstract

ABSTRACTIn this article, a novel design of ultrawideband (UWB) microstrip monopole antenna with enhanced bandwidth and triple band‐notched characteristics has been presented. The antenna consists of fan‐shaped radiating patch with a pair of L‐shaped parasitic structure, a feed‐line with an S‐shaped step‐impedance resonator (SIR) slot and modified ground plane with pairs of T‐shaped strips protruded inside the rectangular slots. In the proposed design, by cutting two rectangular slots with pairs of protruded T‐shaped strips in the ground plane, additional resonances are excited and much wider impedance bandwidth can be produced. Using these modified structures, the usable upper frequency of the antenna is extended from 10.3 to 17.4 GHz. To generate a single band‐notched function, we add a pair of L‐shaped parasitic structures to the fan‐shaped radiating patch. Also, by cutting the S‐shaped SIR at the feed line, dual and triple band‐notched properties are achieved. The measured results reveal that the presented dual band‐notched antenna offers a very wide bandwidth from 2.8 to 17.4 GHz, with three notched bands around of 5–6 GHz wireless local area network, 7.25–7.75 GHz downlink of X‐band satellite communication system, and 8.02–8.4 GHz International Telecommunication Union bands. The antenna configuration is simple, easy to fabricate and can be integrated into UWB systems. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2426–2430, 2014