Abstract
The combination element frequency selective surface (FSS) with regular triangle patches and circular aperture elements in activated carbon fiber (ACF) felts were designed. The effects of the structure parameters and periodic arrangement of regular triangle patches on ACF felt composites were investigated. As the regular triangle patches were embedded into circular apertures, the combination element ACF felt screen (ACFFS) composites presented fluctuant absorbing characteristics and showed double-band frequency response characteristic including band pass and band stop. When the regular triangle edge length (L) increased, the effective absorption frequency (the reflection loss below-10 dB) shifted to low frequency, and the effective bandwidth increased without reducing the maximum absorption value. When the regular triangle patches (L = 30 mm) were in staggered rows, the effective absorption frequency drifted by 3.1 GHz, and the effective bandwidth was enhanced from 4.3 GHz to 11.0 GHz. Although the regular triangle patches are not central symmetry, it is proved that the absorption properties can be improved obviously by both horizontal polarization and vertical polarization.
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