Compact CPW-fed ZOR antenna for WiMAX applications

In this paper, a compact zeroth-order resonating (ZOR) metamaterial antenna with coplanar waveguide (CPW) feed is presented. The proposed antenna has an impedance bandwidth of 19.82% centered at 3.33 GHz. The proposed structure having smaller electrical size 0.288 λ₀ × 0.186 λ₀ × 0.018 λ₀, where λ₀ is the free space wavelength at ZOR mode (at f₀ = 3.33 GHz). In addition, antenna offers peak gain of 2.41 dB with radiation efficiency of 95.88% at ZOR frequency. It offers excellent omni-directional radiation pattern in yz-plane and dipolar-type radiation pattern in xz-plane. In order to verify the metamaterial behavior, dispersion diagram has been plotted according to the extracted circuit parameters. The proposed antenna can be suitable to be used for WiMAX (3.3-3.6 GHz) applications.