The Method of Moments in Electromagnetics, 3rd Edition

Appendix A

Scattering Using Physical Optics

We briefly discussed the Physical Optics (PO) approximation in Section 3.6.4, and we used the PO approximation for conducting interfaces (3.209) in several examples throughout this book. Because it is of vital importance in the treatment of electrically large objects, particularly in the area of radar cross section prediction, we discuss it in additional detail in this appendix. We will first consider the fields scattered from conducting surfaces, and then the fields scattered by dielectric interfaces.

A.1 Field Scattered at a Conducting Interface

Recall again the surface equivalent problem of Figure 3.2c. Given a plane wave incident in Region R₁ with ${\widehat{\theta }}^i$ and ${\widehat{\varphi }}^i$ components, the electric field ...