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In this contribution we exploit the interpretation of the fishnet metamaterial mode in terms of diffraction order of the internal mode (that supported in the parallel waveguide formed in-between metallic perforated layers) to design the fishnet such that the first two propagation bands under normal incidence display backward wave propagation. For the experimental validation of the dual-band effective negative refractive index response, a fishnet-like structure is fabricated to operate at the W-band of the millimeter-waves.

metamaterials; plasmonics; fishnet