Ultrawideband Transmitting Metasurface Design and Behavior Prediction With Analytical Model of Cascade Multilayer Conductors

Metasurfaces have emerged as a transformative technology in modern electromagnetic (EM), yet their design is often guided by empirical approaches lacking a unified analytical framework. This article introduces an efficient method for designing multilayer resonant metasurfaces and accurately predicting their radiation coefficients. The approach relies on a 1-D parametric sweep of a single-layer conductor, enabling numerical prediction of radiation coefficients across varying interlayer spacings and substrate thicknesses. It also facilitates precise estimation of Huygens resonance positions. The method offers high predictive accuracy and significantly accelerates the identification of optimal frequency ranges and unit cell parameters, streamlining the metasurface design process. To validate the proposed technique, a focusing transmission metasurface based on a triple-layer Jerusalem cross unit cell is designed, simulated, and experimentally characterized. The metasurface demonstrates robust transmission amplitude and near-complete phase control across the 6–8-GHz band. Measurements confirm stable focusing performance with minimal focal drift over a 28.6% ultrawide bandwidth.