Numerical/Electromagnetics Code (NEC)

A hybrid numerical electrodynamics code (NEC) code which uses an Electric Field Integral Equation (EFIE) to model wire-like objects and a Magnet Field Integral Equation (EFIE) to model wire-like objects and a Magnetic Field Integral Equation (MFIE) to model surface-like objects with time harmonic excitation is discussed. A three-term sinusoidal spline basis is employed for the wire current while a pulse basis is used for the surface current, with delta-function weights employed everywhere. Provision is made for connection of wires to surfaces via an attachment, or interpolation, basis. NEC includes a number of features for efficient modeling of antennas and scatterers in their environments. The most recent addition, in the version NEC-3, was the capability of modeling wires that are buried or penetrate the ground-air interface. The current status of NEC-3 and plans for Future NEC are discussed. Some typical results are included.