Figure 3
From: High-order localized spoof surface plasmon resonances and experimental verifications

Simulated ECS (black solid line) and theoretically calculated SCS (red dashed line) for a corrugated metallic disk (see inset) with R = 25 mm, r = 2 mm, L = 250 mm (note that the structure is 2D in the theoretical calculations), N = 60 (d = 2.6 mm) and a = 0.5d = 1.3 mm.
The numbers indicate the LSP resonance ordering.