Calculation of the dispersive characteristics of open dielectric structures by the finite-difference time-domain method

Abstract

Abs~uct-An enhanced three-dimensional Finite-Difference Time-Domain (FDTD) technique is applied to the characterization of the fundamental and higher order modes of single and coupled image guide structures. The basic FDTD algorithm is modified to include multidimensional changes of permittivity and an irregular mesh is used for computational efficiency. In this paper FDTD calculations are compared with experimental and theoretical results found in the literature and good agreement is found.

Antenna Radiation in Typical Office Environment: Theoretical Modeling and Measurements

“…Papers [2]- [13] outline the basic theory and application of the 3D FDTD method. This method takes into account both the electric and magnetic fields in 3D model and help to provide an understanding of EM wave propagation within the structures.…”

Grid dispersion error using the nonuniform orthogonal finite‐difference‐time‐domain method

“…It is important to note that because the nonuniform orthogonal update equations are identical in form to the uniform update equations, there is no loss of speed when updating the fields. Care must be taken when computing the coefficients in the nonuniform update equations because variable cell discretization must be taken into account in order to accurately weight the coefficients when dealing with interfaces between different media [3]. However, the advantages from memory savings and the decrease in total run time due to a smaller number of unknowns far outweigh this slight disadvantage.…”

FDTD modelling of IDG structures

“…The basic 3-D FDTD method has been presented in various publications and need not be detailed here [6], [7]. Only the main features of our FDTD code will be discussed.…”

“…In the air region away from a guide the space step is gradually increased to Xmi/20. The propagation characteristic of an IDG structure is obtained using two probes located along the axis of propagation [7]. The propagation constant 3 is given by the Fourier transform of the responses of the two probes.…”