Abstract-Problems of the theory of radio absorbers (RAs) involving frequency selective surfaces (FSSs) are considered. A design procedure for these RAs is described that takes into account the multiparameter character of the problem and allows one to determine the optimal characteristics of an FSS that provide the maximal operating bandwidth. RAs for a range of 1-17 GHz are obtained on the basis of polymer composites filled with carbonyl iron and Co2Z ferrite, into which an FSS in the form of a biperi-odic array of thin metal rings is embedded. It is shown that the application of such an FSS allows one to increase the operating frequency bandwidth of a magnetic-type RA by a factor of more than 1.5 virtually almost without increasing the thickness of the absorber. Substantially, several types of FSSbased layered magne-todielectric RAs have been produced by compressing molding technique, including a 3-mm-thick RA with an operating bandwidth of 1.5-2.7 GHz, a 2-mm-thick RA with an operating bandwidth of 1.7-4.4 GHz, and a 1.6-mm-thick RA with an operating bandwidth of 6.7-16.1 GHz. Index Terms-Electromagnetic

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The 2D problem of excitation of a circular metamaterial cylinder by a filament source is numeri cally investigated. It is found that, when the relative permittivity and permeability are close to minus unity, high Q resonances occur in cylinders of an electrically small diameter. Near and far field patterns are cal culated. It is discovered that, under resonance conditions, a multilobe scattering pattern typical of superdi rective antennas is formed. The influence of loss on the resonance characteristics is investigated.

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