Design of PSOAM Vortex Antenna Based on Spoof Surface Plasmon Polaritons

In this paper, we propose a vortex antenna capable of generating Planar Spiral Orbital Angular Momentum (PSOAM) electromagnetic waves based on spoof surface plasmon polaritons (SSPPs). By bending the SSPPs Leaky-wave antenna (LWA), a plane vortex beam is radiated. The near-field phase diagram of the resonant frequency shows the corresponding PSOAM modes which range from -2 to 1.