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

## TL;DR

This paper introduces a capacitor-loaded spoof surface plasmon transmission line that offers reconfigurable dispersion control and high-selectivity filtering, enabling more compact designs with improved performance without changing the configuration.

## Contribution

It presents a novel SSP-TL design using capacitor loading for flexible dispersion control and size reduction, outperforming conventional SSP-TLs.

## Key findings

- Enhanced dispersion reconfigurability
- Significant size reduction
- Improved filtering selectivity

## Abstract

This letter proposes a new spoof surface plasmon transmission line (SSP-TL) using capacitor loading techniques. This new SSP-TL features flexible and reconfigurable dispersion control and highly selective filtering performance without resorting to configuration change. Moreover, it requires much smaller line 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. To illustrate the design principle, several examples are designed within the frequency range of 2-8 GHz. Both numerical and experimental results are given in comparison with the conventional SSP-TL. It is demonstrated that the proposed technique provides a better performance in size reduction and dispersion reconfigurability.