Compact Ultra-Wideband Monopole Antenna Loaded with Metamaterial
Samir Salem Al‐Bawri, Hui Hwang Goh, Md. Shabiul Islam, Hin Yong Wong, Mohd Faizal Jamlos, Adam Narbudowicz, Muzammil Jusoh, Thennarasan Sabapathy, Rizwan Khan, Mohammad Tariqul Islam
Abstract
A printed compact monopole antenna based on a single negative (SNG) metamaterial is proposed for ultra-wideband (UWB) applications. A low-profile, key-shaped structure forms the radiating monopole and is loaded with metamaterial unit cells with negative permittivity and more than 1.5 GHz bandwidth of near-zero refractive index (NZRI) property. The antenna offers a wide bandwidth from 3.08 to 14.1 GHz and an average gain of 4.54 dBi, with a peak gain of 6.12 dBi; this is in contrast to the poor performance when metamaterial is not used. Moreover, the maximum obtained radiation efficiency is 97%. A reasonable agreement between simulation and experiments is realized, demonstrating that the proposed antenna can operate over a wide bandwidth with symmetric split-ring resonator (SSRR) metamaterial structures and compact size of 14.5 × 22 mm2 (0.148 λ0 × 0.226 λ0) with respect to the lowest operating frequency.