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The Numerical Electromagnetics Code (NEC-2) is a user-oriented computer code
for analysis of the electromagnetic response of antennas and other metal
structures. It is built around the numerical solution of integral equations
for the currents induced on the structure by sources or incident fields.
This approach avoids many of the simplifying assumptions required by other
solution methods and provides a highly accurate and versatile tool for
electromagnetic analysis.
The code combines an integral equation for smooth surfaces with one
specialized for wires to provide for convenient and accurate modeling of a
wide range of structures. A model may include nonradiating networks and
transmission lines connecting parts of the structure, perfect or imperfect
conductors, and lumped element loading. A structure may also be modeled over
a ground plane that may be either a perfect or imperfect conductor.