volume | PIER Journals

Abstract

This study presents a novel technique for designing an ultra-wideband (UWB) filtering-antenna with dual sharp band notches. This design composed of a modified monopole antenna integrated with resonant structures. The monopole antenna is modified using microstrip transition between the feedline and the patch. In addition, block with a triangle-shaped slot is loaded on both sides of the ordinary circular patch to produce wide bandwidth with better return loss and higher frequency skirt selectivity. The resonant structures based on two double split ring resonators (DSRR) loaded above the ground plane of the antenna design to produce dual notched bands, and filter out WiMAX (3.3-3.7 GHz) and HiperLAN2 (5.4-5.7 GHz) frequencies. The band notch position is controlled by varying the length of the DSRR. The reconfigurability feature is achieved by using two PIN diode switches employed in the two DSRR. The measured results show that the proposed filtering-antenna provides wide impedance bandwidth from 2.58 to 15.5 GHz with controllable dual sharp band notches for WiMAX and HiperLAN, peak realized gain of 4.96 dB and omnidirectional radiation pattern.

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Mr. Ammar Alhegazi

Dr. Zahriladha Zakaria

Dr. Noor Azwan Shairi

Dr. Imran Mohd Ibrahim

Dr. Sharif Ahmed