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A closely located dual-band FSS with frequency stability for multi-frequency communication

A novel angular independent dual-band FSS for multi-frequency communication is discussed in this letter. The proposed FSS with closely spaced response is consist of improved cross-shaped metal strips and a dielectric substrate. The unit cell size of the proposed FSS is 0.13λ×0.13λ where λ corresponds to the wavelength of the first resonant frequency. The proposed FSS exhibits dual stop band characteristics at 2.5 GHz and 3.5 GHz providing −15 dB bandwidth of 298 MHz and 290 MHz. Both bands are closely spaced providing the frequency ratio of fH(upper resonant frequency value) to fL(lower resonant frequency value) of 1.40. It also exhibits angular stability up to 60° for both TE mode and TM mode because of its symmetry.