Abstract
In this article, a compact zeroth-order resonance (ZOR) antenna with extended bandwidth is presented. The proposed antenna consists of a rectangular and semicircular patch separated by gap G which is liable for initiating ZOR mode. The semicircular patch and ground planes are connected by a thin stripline, hence, via less coplanar metamaterial structure. The proposed antenna offers measured fractional bandwidth of 23.64% at ZOR frequency (fZOR = 3.60 GHz) with an average peak gain of 2.26 dB with 95.89% radiation efficiency over entire working band. The proposed antenna shows the overall footprint area of 0.276 λ0 × 0.129 λ0, where λ0 is the free space wavelength centered at 3.60 GHz. It also offers dipole like pattern in xz-plane and omnidirectional pattern in yz-plane at ZOR frequency. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:71–75, 2016
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