Abstract
ABSTRACTThis article presents an ultrawideband (UWB) microstrip monopole antenna with band‐notched function around 5.79–6.40 GHz to avoid any interference from the intelligent transport system (ITS). The proposed antenna consists of an ordinary square radiating patch, a feed‐line and a modified ground plane with pair of rotated H‐shaped slots and cross‐shaped conductor‐backed plane. By cutting a pair of rotated H‐shaped slots, additional resonances at higher frequencies are excited and hence much wider impedance bandwidth can be produced, which provides a wide usable fractional bandwidth of more than 135%. In the proposed design, to generate the ITS band‐stop performance, a cross‐shaped conductor‐backed plane is embedded in the ground plane. The proposed antenna can operate from 3.02 to 16.5 GHz with VSWR < 2 and with a rejection band around 5.79–6.40 GHz. The antenna has an ordinary square radiating patch, therefore, displays a good omnidirectional radiation pattern even at higher frequencies. Simulated and measured results are presented to validate the usefulness of the proposed antenna structure for UWB applications. The proposed monopole antenna configuration is simple, easy to fabricate and has a small size of 12 × 18 × 1.6 m3. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1641–1644, 2014
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