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High-impedance surfaces are artificial surfaces synthesized from periodic structures. The high impedance is useful as it does not short circuit electric currents and reflects electric fields without phase shift. Here, a sum rule is presented that relates frequency intervals having high impedance with the thickness of the structure. The sum rule is used to derive physical bounds on the bandwidth fo

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'Women in Literature': This paper was presented at a Symposium on 'The Image of Woman in Literature' held in Malmö and Lund, March 8-10, 2002. The Symposium was chaired by Henry Diab and Jalil Haidar.