Abstract

In this work, a bandwidth tunable microstrip band-stop filter is theoretically investigated and experimentally verified based on the concept of localized spoof surface plasmons. By placing a conventional microstrip at the bottom center of a symmetrically periodically corrugated metallic strip, which supports spoof surface plasmons with a single defect or a series of defects of continuously variable dimensions, localization of the quasi-static field propagating along the microstrip can be realized, thus facilitating control of the central frequency, bandwidth, and absorption level of the microstrip band-stop filter. A band-notched microstrip and a band-stop one are cautiously designed and verified through simulations and experiments, which can find potential applications in microwave band-stop circuits.

© 2016 Optical Society of America

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