Compact pentamode, tri-band metamaterial antenna for wireless applications

A novel compact pentamode, triband coplanar waveguide fed metamaterial antenna is proposed. The left-handed (LH) inductance is provided by two parallel short ended spiral inductors. We achieved pentamodes of resonance consisting of negative modes, zeroth mode and positive modes. The resonance frequency at each of these modes are f_-2=1.01 GHz, f_-1=2.11 GHz, f₀=2.48 GHz, f₊₁= 3.04 GHz and f₊₂=3.54 GHz with triband obtained at f_-2, f₀ and f₊₂ resonances. Gain of the proposed structure obtained was about 1.415 dB. The proposed antenna serves the criteria for multiband applications with an additional feature of increased bandwidth at the zeroth mode. The operational bandwidth covers the required bandwidths of the IEEE 802.11 wireless local area networks (WLAN) standards and worldwide interoperability for microwave access (WiMax) standards. This proposed antenna is most suitable for precise applications in point to point wireless communication.