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Numerical investigations are presented for a multilayer frequency selective surface with Koch
fractal (levels 1 and 2) conducting patch elements. The structure investigated is obtained using two FSS
screens separated by an air gap layer. For the proposed investigation were used three different values an
air gap height. The results obtained using the numerical method were compared with other technique and
using the commercial software Ansoft DesignerTM. A good agreement was observed in terms of the
bandwidth.
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