Compact UWB monopole antenna with WiMAX/ITU band notch characteristics

A compact ultra wideband (UWB) antenna with dual band-notched characteristics is proposed and investigated in this article. The antenna is composed of a V-shaped patch with a stair case defect fed by a 50 Ohm microstrip line and a semicircular defected ground plane printed, respectively, on the top and bottom layer of the substrate. The dual band-notch function at WiMAX (3.17-3.85 GHz) and ITU (7.9-9.1GHz) bands are achieved using two parasitic stubs that are attached to the patch, and an inverted U-shaped slot that is etched on the transmission line, respectively. The proposed structure is printed on FR4 material and operates over the frequency range between 2.57-11.3 GHz with WiMAX and ITU dual notched bands characteristics. The measured results of the proposed antenna with overall size of 23×32 mm
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show acceptable performance and good agreement with the simulated results.