Abstract
This article presents a bandwidth-controllable band-stop filter based on spoof surface plasmon polaritons (SSPPs) transmission line in the microwave frequency band. The approach of introducing rectangular slots into the corrugation strips offers a greater degree of flexibility in the SSPPs unit cell design. Meanwhile, the high-order mode can be pulled to the low frequency segment of interest. The lower and upper edge of the stop band of this filter, therefore, can be controlled independently and conveniently. An equivalent circuit model of this unique unit cell is proposed for analyzing stop band formation and guiding the design of this SSSPs filter. Both numerical simulations and measured results demonstrate excellent stop band performance of the filter. The proposed filter may have potential applications in the SSPPs-based communication system.
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