Figure 5. Simulated ECS spectra (between 8 and 11 GHz) showing the signature of various second-order spoof LSPs for L = 25, 12.5, 6, 3 and 0.018 mm (panels from top to bottom.
The insets in the top and bottom panels render the most intense resonance: dodecapole (decapole) LSP for L = 25 mm (L = 0.018 mm).