An Efficient Method for Calculation the Physical Optics Integral by Using Complex Source Beam for Electrically Large Reflector Antenna Applications

摘要

The physical optics method is a widely used radiation and scattering estimation for electrically large-scaled objects, and it is finally reduced to the calculation of highly oscillatory integrals. In this article, the physical optics integrals over the reflecting surface for an incident complex source point is evaluated here in closed form. A complex source point can generate a beam field, which is employed to expand an arbitrary source via a complex extension of the surface equivalence principle. Then the complex source beam expansion method is applied to analyze the field of large reflector antennas via physical optics method. Numerical examples are presented to illustrate the accuracy and efficiency of this complex source beam-physical optics hybrid method for analyzing general parabolic reflectors.