Figure 4
From: Spoof Surface Plasmon Polaritons Power Divider with large Isolation

(a) The bent half oval-ring SSPPs waveguide, in which θ = 90°, R = 34 mm and s2_L = 5.5 mm. (b) The simulated |S11| and |S21| magnitudes of the bent half oval-ring SSPPs waveguide.