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Abstract

This article proposes the design of a compact beveled rectangular planar monopole antenna for Ultra wideband (UWB) applications. The radiating element is printed on a low- cost FR-4 epoxy substrate with relative permittivity of 4.4 and thickness of 1.6mm. It has overall dimensions of 18×15×1.6 mm3. A 50-ohm coplanar waveguide (CPW) transmission line is used to excite the proposed antenna. The simulated impedance bandwidth of the proposed antenna for -10dB reflection coefficient is from 2.9GHz to more than 12GHz. Radiation efficiency better than 90% and group delay variation less than 1ns are obtained throughout the UWB. Furthermore, a stable omni directional radiation and a peak gain of 3.91dB are observed. A prototype of the proposed antenna is fabricated. The measured reflection coefficient of the proposed antenna covers a wide impedance bandwidth from 2GHz to over 12GHz with S11 better than -10dB.