Computational issues in electromagnetic coupling to a slit cylinder enclosing an offset cylinder
Abstract
The canonical scattering and aperture coupling problem of a plane wave incident upon a slit cylinder enclosing another offset cylinder has been analytically solved using a dual series approach. The solution expressions are nested sums involving Bessel functions. Numerical evaluation of the physical quantities of interest (bistatic radar cross sections, induced currents, and induced fields) typically requires Bessel functions for thousands of arguments, and several hundred orders at each argument. Thus, the execution time of the Bessel function routines becomes critical. A comparison of the timing and accuracy of the new FPS Bessel function software with other non FPS Bessel function routines will be given. In addition, there are two major considerations in developing graphics post processing routines to display the solutions which result from this modeling. First, there is a large number of different system geometries and incident field conditions to model, each with its own computed solutions. Secondly, cross comparisons of different physical quantities are desired to help develop an understanding of the relevant physics. These post processing needs have required the development of several new graphics display methods. A variety of examples from this canonical coupling problem will be given to demonstrate the efficacy of these graphical display routines.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 January 1987
 Bibcode:
 1987STIN...8727089S
 Keywords:

 Apertures;
 Computer Graphics;
 Electromagnetic Coupling;
 Slits;
 Bessel Functions;
 Electromagnetic Radiation;
 Scattering Cross Sections;
 Communications and Radar