Dynamic Modeling of Liquid Crystal-Based Metasurfaces and Its Application to Reducing Reconfigurability Times

This article describes and validates for the first time dynamic modeling of liquid crystal (LC)-based planar multiresonant cells, as well its use bias signals synthesis tool to improve their reconfigurability time. The LC director equation is solved in longitudinal direction through finite-element method, which provides ${z}$ - time-dependent inhomogeneous permittivity tensor used an electromagnetic simulator evaluate cell behavior. proposed model has been experimentally validated using reflective cells phase control (reflectarray) measuring transient phase, both excitation relaxation regimes. It shown how a very reduced number stratified layers are needed material inhomogeneity that even homogeneous effective can be most cases, allows simplification suitable design procedures without losing accuracy. Consequently, novel signal significantly reduce transition times hence electrically large antennas composed them. These tools, similar those optical displays, at mm- sub-mm wave frequencies this work, obtaining improvement orders magnitude.