A More Generalized Scattering Matrix for the Analysis of Active Modulated Metasurfaces

Recently, spatio-temporally modulated metasurfaces have received considerable attention among research groups around the world due to their extraordinary properties and interesting applications. That makes having a tool to model these structures and predict their behavior accurately, important and even vital for many applications. In this paper, a new analytical model is developed which is able to model a large group of spatio-temporally modulated metasurfaces. In this extension, a time-varying impedance boundary condition in conjunction with novel generalized scattering parameters is proposed and utilized. The developed analytical model is then validated through comparison with the results reported in previous works.