Figure 2
From: Spoof Surface Plasmon Polaritons Power Divider with large Isolation

(a) The photograph of SSPPs waveguide. (b) The simulated and measured S-parameter curves of the proposed oval-ring SSPPs waveguide.
From: Spoof Surface Plasmon Polaritons Power Divider with large Isolation

(a) The photograph of SSPPs waveguide. (b) The simulated and measured S-parameter curves of the proposed oval-ring SSPPs waveguide.