Universal HIE-FDTD method and progarm implementation for one-dimensional fine structure electromagnetic target simulation

The hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) method is a weakly conditionally stable (FDTD) method. time step size of the HIE-FDTD only confined by two coarse spatial cell sizes, so it widely used in simulation electromagnetic targets with fine structures along one direction. In this work, basic iterative formulations are proposed approximating FDTD these formulations, coefficients marked grid numbers. Therefore, can be calculated automatically according to medium parameters cells indexing Since triangular matrix which calculate electric field based on coefficients, also updated automatically. addition, reduce number tridiagonal matrices effectively calculation memory and improve efficiency. method, equivalent employed at interfaces different media convolution perfectly matched layer boundary condition truncate computational region. Based series programs implemented, simulate arbitrary structure dimension linear non-dispersive space. A dielectric plate irradiated planar wave dual-frequency microstrip inverted F antenna simulated using programs. numerical results good agreement those from traditional CST software, efficiency greatly improved comparison that This study provides reliable tool for wide application