Dynamic Controlling of Transmission Characteristics of Spoof Plasmonic Metamaterial

In this paper, spoof surface plasmon polaritons (SSPPs) supported by periodic unit cells formed by metallic stubs loaded with PIN diodes are proposed. Dispersion properties of SSPP with a diode in both on and off states are analyzed. A SSPP waveguide constructed by the proposed unit cells is designed and simulated. As a result, dynamic control of two different transmission characteristics, such as band-pass and band-stop features, can be realized by using the two different states of the PIN diodes. The simulated passband with a return loss higher than 10
$\text{dB}$
ranges from 3.01 to 10.16 GHz, while the stopband with a rejection level better than -20
$\text{dB}$
is from 3.94 to 5.88 GHz. The simulation results verify the feasibility of the proposed strategy based on PIN diodes and pave the way for the development of reconfigurable spoof plasmonic metamaterials.