Tunable 360 Degrees Phase Shifter Based on Spoof Surface Plasmon Polaritons Waveguide

Abstract

A tunable 360 degree phase shifter based on active spoof surface plasmon polaritons (SSPP) waveguide is proposed for the first time. The device consists of a passive SSPP waveguide and 7 varactor diodes are applied on it. The working principle of the tunable phase shifter is that the dispersion curve is tunable with different applied capacitance, which means different transmission phase of one unit cell is achieved with different capacitances. Both the full wave and Eigenmode simulation show a variation of 180-360 degrees tunable phase within 6.6-7.2 GHz. This design further extend the application of SSPPS.