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A compact gain-enhancement patch antenna based on near-zero-index metamaterial superstrate

A compact high-gain patch antenna based on near-zero index metamaterial (NZIM) superstrate lens operating at 2.44 GHz is proposed. A single layer NZIM superstrate with unit-cell periodicity of 3 × 4 is designed and suspended above a patch antenna at a very close distance of 0.097 λ. Simulation results show that the NZIM superstrate could converge the electromagnetic wave radiated by the antenna to enhance the radiation gain. The proposed single layer NZIM superstrate provides a gain enhancement of 2.3 dB at 2.44 GHz to a conventional patch antenna.