Reconfigurable Spoof Surface Plasmon Polaritons Based Band Pass Filter

This paper reports design and even-odd mode analysis of a reconfigurable band pass filter using the concept of spoof surface plasmon polaritons (SSPP). The designed filter consists of a crossed shape resonator in which tuning has been introduced using varactor diodes. The filter has been developed on a 60 mil thick laminate and characterized using Keysight Field-Fox analyzer N9918A. The characterized filter has a tunable center frequency from (3.43 - 3.88 GHz) with insertion loss less - 5 dB along with a tunable lower or upper band edge. The proposed reconfigurable filter will play an important role in the design and development of plasmonic circuits and systems.