作者: Sajad Haq , Nigel Seddon
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摘要: This invention relates to periodic electromagnetic structures (20) for use over a relatively large range of frequencies. In particular, this microwave applications, such as antennas and low reflectivity structures. A structure is provided that comprises an array conducting LC elements (22) in superposition with frequency-dependent dielectric (30) whose permittivity and/or permeability varies according the frequency radiation incident thereon resonant follows radiation.