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This letter proposes a new spoof surface plasmon transmission line (SSP-TL)using capacitor loading techniques. This new SSP-TL features flexible andreconfigurable dispersion control and highly selective filtering performancewithout resorting to configuration change. Moreover, it requires much smallerline width than the conventional SSP-TLs for achieving a extremely slow wave(or a highly confined field), which is quite useful for a compact system. Toillustrate the design principle, several examples are designed within thefrequency range of 2-8 GHz. Both numerical and experimental results are givenin comparison with the conventional SSP-TL. It is demonstrated that theproposed technique provides a better performance in size reduction anddispersion reconfigurability.

Capacitor-Loaded Spoof Surface Plasmon (SSP) for Flexible Dispersion Control and High-Selectivity Filtering