Finitedifference analysis of EMP coupling to thin struts and wires
Abstract
This paper describes the implementation of the thinstrut formalism in the 3D EMP timedomain finitedifference code THREDE. The thinstrut formalism permits inclusion of arbitrary fine wires in THREDE without imposing any corresponding demand to reduce the cell size to the wire size. The keystone of this technique is the socalled incell inductance  the inductance per unit length a thin wire would have with respect to an enclosing conductor half a cell removed. THREDE results using this formalism are compared with analytic EMP solutions for a linear dipole antenna and a loop antenna. Errors are around 10 percent for the loop and 7 percent for the dipole. The 10percent loop error could probably be improved; the 7percent dipole error seems to be fundamental to the basic THREDE approximations.
 Publication:

IEEE Transactions on Electromagnetic Compatibility
 Pub Date:
 May 1981
 Bibcode:
 1981ITElC..23...88H
 Keywords:

 Electric Wire;
 Electromagnetic Coupling;
 Electromagnetic Pulses;
 Electromagnetic Scattering;
 Finite Difference Theory;
 Struts;
 Computer Programs;
 Error Analysis;
 Inductance;
 Loop Antennas;
 Thin Bodies;
 Time Dependence;
 Communications and Radar