SEM formulation of the fields scattered from arbitrary wire structures

The late-time field scattered from an arbitrary wire structure is formulated in terms of the singularity expansion method (SEM), and the contribution of each mode is shown to be representable as the product of two coupling coefficients. One coefficient governs how much of the incident field couples to each natural mode, and the other governs how much of each natural mode couples to the reradiated field. Numerical results are presented for the fields scattered from both straight and L-shaped wire structures and are compared to fields calculated using frequency-domain techniques. The fields calculated using these two different techniques are shown to agree very well after an appropriate time interval has elapsed.