Computational electromagnetics

About: Computational electromagnetics is a research topic. Over the lifetime, 6412 publications have been published within this topic receiving 113727 citations. The topic is also known as: Electromagnetic field analysis.

Pulse propagation in random media

Abstract: A new approach is developed to investigate pulse propagation in random media, taking into account the effects of multiple scattering. The technique is based on the idea of temporal moments of the signal. It is shown that these temporal moments are related to the coefficients of expansion for the two-frequency mutual coherence function \Gamma in terms of the frequency separation. These coefficients, and therefore the moments, can be solved analytically in sequence without making assumptions about the strength of the turbulence. Using these moments, a least square orthogonal polynomial expansion procedure is developed to obtain the average intensity of the pulse as it propagates through the turbulence. It is also shown that the technique can be used for propagation through random media with discrete scatterers. An example is given to demonstrate the procedure.

Transmission line matrix method reduced order modeling

Abstract: The finite-difference time-domain (FDTD) method and the transmission line matrix (TLM) method allow the formulation of state-equation representations of the discretized electromagnetic field. These representations usually involve very large numbers of state variables. Reduced order modeling (ROM) of the investigated structure may yield considerable reduction of the computational effort and can be used to generate compact models of the electromagnetic system. While complexity reduction approaches based on moment matching techniques have been intensively studied in the case of FDTD, they have not yet been considered for TLM. In this paper, we apply Krylov subspace methods to TLM using the basic Arnoldi and non-symmetric Lanczos algorithms. It is shown that the inherent unitarity property of the TLM operator nevertheless implies an essential difference in comparison to former implementations for FDTD or circuit analysis. Simulation results for a rectangular cavity resonator using both TLM with and without ROM and a study of the convergence of the eigenvalues are presented here.

Electromagnetic scattering from thin strips. II. Numerical solution for strips of arbitrary size

Abstract: Electromagnetic scattering from thin resistive strips is formulated using an integral equation approach. The formulation is then specialized to strips of constant curvature and arbitrary size allowing the employment of the method of moments to solve the scattering problem.

Advances in Electromagnetic Modelling through High Performance Computing

Abstract: Under the DOE SciDAC project on Accelerator Science and Technology, a suite of electromagnetic codes has been under development at SLAC that are based on unstructured grids for higher accuracy, and use parallel processing to enable large-scale simulation. The new modeling capability is supported by SciDAC collaborations on meshing, solvers, refinement, optimization and visualization. These advances in computational science are described and the application of the parallel eigensolver Omega3P to the cavity design for the International Linear Collider is discussed.