In this paper, a three-dimensional (3-D) tunable band-stop frequency selective surface (FSS) with wide tuning range is presented. The proposed tunable 3-D FSS consists of a periodic array of an annular resonator loaded with two varactor diodes. By controlling the reverse voltage of the varactor diodes, the resonance frequency could be tuned in a wide frequency range. Full-wave simulation shows 100% tuning range from 3.0 GHz to 6.0 GHz with respect to lower resonance frequency. The simulated results exhibit stable band-stop performance under different incident angles (up to 45˚). By cascaded two 3-D tunable FSSs, the bandwidth and selectivity performance could be further enhanced. The proposed 3-D FSS with its stable stop-band performance can be a potential candidate to shield the RF signals which is the major source of problem leading to RF device malfunctions.
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