Time-domain modeling techniques for periodic structures

Novel time-domain modeling techniques for periodic structures are described in this paper. These methods can be used to investigate electromagnetic propagations and scatterings from infinite artificial periodic arrays from arbitrary electromagnetic source illumination and extract the equivalent electric properties of composite structures. Using this method, only a single periodic cell is required in the modeling using finite-difference time-domain method. Several periodic structures are analyzed by this proposed method to testify its computational efficiency in terms of computer memory and computing time.