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In this paper we proposed a novel tri-band complementary frequency selective surface (CFSS) with a traditional geometry composed of double concentric rings. The choice of this geometry is because of its very good angular stability. The proposed resonant frequencies were 2.5 GHz, 3.5 GHz, and 4.5 GHz. The CFSS is low profile and presents angular stability and polarization independence. Simulations were performed using HFSS software and they are compared with the experimental results for validation purposes. A very good agreement is observed between them.
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