Finite-Difference Time-Domain Method with the Modified Assigned Material Parameters Concept
Abstract
This report presents the derivation and evaluation of the Modified Assigned Material Parameters (MAMP) concept as an extension of the finite-difference time-domain (FDTD) method for electromagnetic modeling. In the MAMP concept, a correction factor to the material parameters of a cell is calculated for structures in a cell, thereby accounting for nonlinear field distributions in the cell. As this is equivalent to a physical material, the resulting FDTD equations have the same stability constraints as Yee FDTD. To determine the MAMP coefficients around a cylinder, I use the characteristic near field of a metal cylinder which is derived in this report. To accurately evaluate the MAMP concept, I develop and evaluate enhancements to the total-field/scattered-field method for the generation of an incident plane-wave in two-dimensions. In addition, I show the errors from a conventional method for the evaluation of the scattered far-field versus alternatives. In summary, I show that MAMP concept provides some increase in accuracy for the scattering by small cylinders, but to be useful in general requires the quasistatic solution for general shapes and further improvement will require a different formulation of the MAMP concept.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 25, 2021
- Accession Number
- AD1134518
Entities
People
- Michael S. Kluskens
Organizations
- United States Naval Research Laboratory