Figure 5
From: Radiation loss of planar surface plasmon polaritons transmission lines at microwave frequencies

Current distribution on different TLs. (a) Current distribution of a microstrip. (b) Current distribution of a CPW. (c) Overview of currents on the corrugated strip @f = 2 GHz. (d) Detailed view on currents distribution of the SPP TL @f = 2 GHz.