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We present here the design, fabrication and numerical as well as experimental results of a low-profile hybrid Wood zone plate fishnet metamaterial lens working at ƒ = 99 GHz. The fishnet metamaterial with effective refractive index close to zero (n = 0.51) acts as an anti-reflecting layer as well as a beam shaper, increasing the overall efficiency while maintaining low profile, low cost and ease of...
Reduction of first side-lobe level (SLL) and nulls in artificial fishnet metalenses is accomplished here by applying the reference phase concept along with the zoning technique. Higher focusing efficiency is achieved for a specific reference phase when comparing numerically and experimentally four different designs. For such best design, an improvement of the first SLL (${\sim}\mathbf{2.4}\;{\mathbf{ dB}}$...
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