volume | PIER Journals

Abstract

This article presents an enhanced-gain ultra-wideband (UWB) antenna with multiple notch responses to suppress the effects of coexisting wireless systems. The proposed antenna is developed in two stages. In the first stage, a reduced-ground U-shaped monopole with parasitic patches was designed to obtain a wide bandwidth between 3.02 and 10.76 GHz while maintaining a peak realized gain higher than 7 dB. In the second stage, selective frequency-rejection capabilities are tuned using split-ring structures (SRSs) for dual and higher-order notch responses. Two configurations are studied: dual-set SRS, which gives rise to low and high region notches centered at 5.73 GHz and 8.31 GHz, respectively, and higher-order SRS notch configuration providing a broad notch about 6.78 GHz with a 5.45% fractional rejection bandwidth. Parametric analysis indicated that the notch depth, notch bandwidth, and center frequency were independent and could be controlled via geometric tuning. The simulated results, supported by measurements from Keysight's PNA-X, corroborate the reflection coefficient, gain behavior, and notch performance; any deviations are attributed to variations experienced during the fabrication. The proposed approach achieves a UWB, increased gain, and flexible interference suppression, qualifying it for modern UWB communication systems that require a compact design.

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Mr. Mohammed Fadhel Hasan

Mr. Hussein Al-Jeshami

Dr. Hussam Al-Saedi

Dr. Hussain A. Hammas

Dr. Muhannad Y. Muhsin

Prof. Jawad K. Ali