Cavity Modeling Of Electromagnetic Scattering And School Mold

Cavity structure is a special kind of electromagnetic scattering object. Such a special structure can normally contribute a main part to the RCS of the entire target. Analyzing its EM scattering property is very helpful to the RCS prediction of the entire scattering object. Generally speaking, the cavity structures in many real targets have not only the large open aperture but also the irregular shape. For such large cavities, it is difficult to analyze electromagnetic scattering based on an accurate mathematical model. On account of above difficulties, a series of accurate mathematical models for arbitrarily curved three-dimensional cavity with varied section based on CRM are presented. A lot of RCS results of complex cavities are calculated based on these models. Many conclusions for RCS reduction and prediction are presented. With the exception of these, the method of simplifying data is also presented. And using this method, we verify the general cavity RCS computing software. In Chapter 1, we analyze the electromagnetic scattering of general cavity based on the contrast of waveguide mode method, geometrical optics method, Gaussian beam method and Complex ray method (CRM). The contrast shows that CRM is effective for complicated cavity RCS prediction. The Chapter 2 is assigned to introduce some necessary theory of complex ray method. The characteristics and analyzing methods are also introduced in this chapter. In Chapter 3, the key step of using CRM for analyzing RCS of complex cavity is discussed. This discussion includes complex ray expansion, ray tracing, paraxial approximation and far field computation. In the last part of this Chapter, the method of using Hermite surface to simulate arbitrary cavity is presented. Moreover the problem of general cavity RCS computing software design is presented. The method to simplify and deal with the RCS data is discussed in Chapter 4. General steps of procedure and interface are introduced. In Chapter 5, we test the general cavity RCS computing software by using some measurement data or the data from other references. Chapter 6 includes some numerical results of these models and methods. By analysis of these results, some valuable conclusions of various factors to affect the cavity RCS are presented. As an important part of this paper, we designed general software of the electromagnetic scattering of complex cavity structure. This software has a good performance of interface, maintenance and extension.