## A Finite Element Computation of the Electromagnetic Fields Within an Engine

- Cooper, Lt. Thomas G
- Inlet Model. MS Thesis, School of Engineering,
- 1982

i A simple ray tracing approximation for the high frequency scattering from a two-dimensional cavity is developed. Whereas many other cavity scattering algorithms are very time consuming, this method is very swift. The analytical development of the ray tracing approach is performed in great detail, and it is shown how the radar cross section (RCS) depends on the cavity's length and width, and the radar wave's angle of incidence. This explains why the cavity's RCS oscillates as a function of incident angle. The RCS of a two-dimensional cavity was measured experimentally, and these results were compared to computer calculations based on the high frequency ray tracing theory. 1 The comparison was favorable in the sense that angular RCS minimums and maximums were predicted exactly even though absolute accuracy of the RCS magnitude decreased for incident angles far off-axis. Overall, once the method is extended to three dimensions, this technique shows promise as a fast first approximation of high frequency cavity scattering.

@inproceedings{DeringHighFE,
title={High Frequency Estimation of Two-dimensional Cavity Scattering Thesis},
author={Robert Scott Dering and Randy J. Jost}
}