Creeping Ray Analysis of Resonance for Prolate Spheroid

摘要

A ray orbit resonance condition is postulated and shown to reproduce asymptotically the resonant frequencies of a prolate spheroid. The method uses local creeping rays associated with a smooth convex impedance surface. As expected, the method deteriorates for high aspect ratio spheroids where the tip radii of curvatures are electrically small. This work is an alternative approach to Howard's earlier geometric treatment and gives the relation to creeping ray analysis. The theory provides impetus to the understanding of mode conversion and diffraction ray coupling near edges of such scatterers. Comparison of pole location, pole trajectories and layering is given. Keywords: Radar reflections. (jhd)