Abstract
ABSTRACTA simple coplanar waveguide fed hexagonal like open slot antenna has been considered for ultrawide bandwidth (UWB) in this article. This antenna is then modified to obtain dual band rejection. Dual band rejection frequencies (WLAN: 5.0–5.9 GHz, WiMAX: 3.3–3.7 GHz) at 5.5 and 3.5 GHz are achieved by embedding a U‐shape slot in the exciting stub as well as a couple of L‐shape open circuit stubs at the edge of the slot, respectively. The length and width of the U‐shape slot and L‐shape stubs offer sufficient freedom for selecting and shifting the notch bands. Impedance bandwidth, gain and radiation characteristics of them are studied and discussed here. A prototype and proposed antenna is designed, fabricated, and tested. The simulated and measured results of the proposed antenna have reasonable agreement between them. Proposed antenna has acceptable performances in terms of bandwidth, radiation pattern, gain, efficiency, phase, and group delay. Hence the proposed antenna may be suitable for UWB applications. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:434–443, 2014
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