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The engineering design of antenna arrays requires the knowledge of the mutual coupling within and/or between antenna arrays, which is typically obtained by expensive and time-consuming measurements due to the limited capability of computational methods. Therefore, an efficient numerical method is highly desirable for such problems to speed up the design process, reduce the cost, and expand the optimization...
In the simulation of multilayer circuit boards or packages, it is often of interest to know the interaction between different nodes inside the structure, and as a result internal ports have to be employed. In this paper the approximate modal interface (AMI) formulation is presented, including internal ports, which are in the form of a lumped current source assigned along element edges. The resulting...
The electric field integral equation (EFIE) has been widely used in the moment method (MoM) solution of electromagnetic problems. However, due to the spectrum property of the EFIE operator, the resulting MoM impedance matrix has eigenvalues clustered around the origin and at the infinity as the mesh density increases, leading to a dramatic increase of the matrix condition number. When the object is...
This paper reports our recent progress on the study of the tree-cotree splitting (TCS) technique for solving low frequency instability problem in the finite-element full- wave analysis so as to achieve a broadband simulation from high frequencies down to the DC region. In this paper, the tree-cotree splitting is applied with a diagonal scaling to further improve the matrix conditioning so that the...
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