The Metamaterial Antenna: A Novel Miniaturized Dual-Band Coplanar Waveguide-Fed Antenna with Backed Ground Plane

A miniaturized dual-band coplanar waveguide (CPW)-fed metamaterial (MTM) antenna is presented and developed in this article. The antenna is an asymmetric structure composed of two identical elements and one backed ground plane. Each element consists of an interdigital capacitor (IDC) connected with a radial stub by means of a thin strip. These stubs act as virtual ground planes because they offer high capacitance at higher frequencies. The proposed antenna shows a compact nature with an overall electrical size of 0.145 λ₀ X 0.20 λ₀ X 0.018 λ₀ and a radiating element size of 0.043 λ₀ X 0.073 λ₀ X 0.018 λ₀ at f 0 = 3.52 GHz, which is attributed to eliminating the ground plane on one side. This antenna offers two resonant modes at 3.52 and 5.17 GHz with 6.6% and 4.25% fractional bandwidths, respectively. The first mode is originated by the combination of a patch and a backed ground plane at λ/4 resonance, while the second resonance is the zeroth-order resonance (ZOR). In addition, the proposed antenna exhibits a simulated gain of 1.44 and 2.70 dBi at 3.52 and 5.17 GHz, respectively, in the boresight direction. The antenna can be applicable for worldwide interoperability for microwave access (WiMAX) and wireless local area network (WLAN)/Wi-Fi applications because of the ease of fabrication and compactness.