Abstract
A three-dimensional (3-D) band-stop frequencyselective structure (FSS) with high selectivity is presented in this paper. The FSS unit cell is composed of an annular resonator loaded with two lumped capacitances. The simulation results show that the proposed 3-D FSS has high selectivity and small size (3mm×5mm×6mm, 0.095λ 0 ×0.158λ 0 ×0.190λ 0 , λ 0 refers to the resonant wavelength in free space at 9.5 GHz). The simulated results exhibit stable band-stop performance under different incident angles (up to 45°). By cascading two 3-D FSS unit cells, the bandwidth and selectivity could be further enhanced. Compare to the traditional two-dimensional (2-D) FSS, the presented FSS shows higher selectivity and better angle stability.
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