Abstrac-The electromagnetic modeling of engine cavities is a very difficult task because the electrical size of the cavity is very large, while the engine termination is geometrically complex. High-frequency techniques can adequately model the cavity, but perform poorly when applied to the termination. Low-frequency techniques are currently infeasible for such large geometries because of the large memory and computation time requirements. In this paper, we present a hybrid method which combines the,most attractive features of the low-and high-frequency techniques. The finite-difference time-domain (FDTD) method is applied to the small region surrounding the termination. The remainder of the cavity is modeled with ray methods. To validate this method, we consider two-dimensional cavities with complex terminations. Our results are compared against those found from a hybrid combination of the modal method and the method of moments.
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