Derivation and Application of Approximate Boundary Conditions
Approximate boundary conditions (or abc’s) can be very helpful in simplifying the analytical or numerical solution of scattering problems involving complex structures, and are becoming more important as we seek to model some of the complicated materials in use today. Some versions have been around for a long time, for example, the classical condition Etan = 0 at the surface of a metal. Although often regarded as exact, it is in fact an approximation for all metals even at microwave frequencies.
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