Computer Codes for EMP Interaction and Coupling

The properties of a number of digital computer codes appropriate for various classes of external coupling problems are described. Limitations and approximations of numerical methods in general are reviewed. Thin-wire codes are tabulated to indicate their basic properties, special features, and structures analyzed, including grid models of surfaces and wire stick models of aircraft. Surface codes are tabulated for bodies of revolution, arbitrary surfaces and hybrid surface-wire or surface-aperture configurations in or below the " resonance" regime, and GTD codes for higher frequencies. Various aperture codes for studying apertures in planes, in empty bodies, or with a wire pickup behind the aperture are summarized and tabulated. Some codes for long cables above or below the earth are reviewed. Conclusions warn against imprudent use of computer codes in general.