SBIR-STTR Award

The proposed research combines an innovative eigenvector method with other electromagnetic techniques to produce a hybrid approach towards solving the EM coupling to satellite cavity problem. The physical structure is divided into an exterior region and one or more interior regions. The exterior region is modeled with method of moments (MOM) and or hybrids of MOM with the uniform theory of diffraction. The interior is modeled with an eigenvector analysis. Since the interior is not perfectly conducting at the aperture(s), the classical eigen analysis is extended to account for coupled, generalized impedance boundary conditions at the aperture. The impedances are found from the exterior problem solution. The interior and exterior problems are first formulated in isolation (without coupling), then joined together by a method similar to Householder's Method of Modified Matrices, taken from the Air Force's GEMACS (General Electromagnetic Model for Analysis of Complex Systems) software. The research will demonstrate the proposed method in one, two, and three dimensions. The three-dimensional demonstration will be for a rotationally symmetric structure, such as optical telescope. However, the full three-dimensional theory will be formulated and documented.|

Benefits:
The major benefit of this research is the development of a computationally efficient method for studying electromagnetic coupling to cavities, particularly cavities with electrically large apertures. This has immediate benefits in satellite and aircraft assessment, but also commercial potential in aerospace and computer industries.

Keywords:
GEMACS APERTURES COUPLING EIGENVECTOR ELECTROMAGNETIC HOUSEHOLDER METHOD HYBRID SATELLITE

This proposed research combines an innovative eigenvector method with other electromagnetic techniques to produce a hybrid approach to solve the EM coupling to satellite cavity problem. The physical structure is divided into an exterior region and one or more interior regions. The exterior region is modeled with method of moments (MOM) or hybrids of MOM with the uniform theory of diffraction (UTD). The interior is modeled with an eigenvector analysis. Since the interior is not perfectly conducting at the aperture(s), the classical eigen analysis has been extended to account for coupled, generalized impedance boundary conditions at the aperture. The impedances are found from the exterior problem. The interior and exterior problems are first formulated in isolation (without coupling), then joined together by a method similar to Householder's Method of Modified Matrices, taken from the Air Force's GEMACS (General Electromagnetic Model for the Analysis of Complex Systems) software. This Phase II effort will utilize Phase I results to develop a fully general three-dimensional technique and demonstration software. The theory and accompanying software will be used to analyze exterior-to-interior coupling, cavity-to-cavity coupling, densely filled cavities, cavity radiation and similar problems.