Transmission line model-based dielectric equivalent method in MFSS applications

This study proposes a novel dielectric equivalent method (DEM) based on transmission line (TL) model. By treating metal and dielectric layers as an integrated module, DEM enables the direct computation of equivalent lumped circuit parameters without relying on traditional dielectric-to-lumped parameter conversions. This approach overcomes limitations in previous methods, providing a clear physical interpretation and enhancing design flexibility. The method is validated by designing a multilayer-FSS with Chebyshev filter properties, achieving a bandpass range of 8.5-11.5 GHz with a relative bandwidth of 0.45. The DEM not only preserves the scattering characteristics of the original TL model but also allows for the substitution of ideal dielectrics with practical materials. The results demonstrate high accuracy and applicability, offering a robust solution for the efficient design and fabrication of multi-layer frequency selective surface.