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In this paper, one kind of subgrid technology using physical connection between different sizes cells is presented. Huygens method, one representation of equivalence principle, is used to solve the problems of filed values on the interface of different size cells. This new technology could solve electromagnetic problems for discontinuous structures. Numerical simulation of EWB structure is implemented.
A weakly conditionally stable (WCS) finite-different time-domain (FDTD) algorithm is presented for resonant cavity analysis. The time-step in the WCS-FDTD is based on the largest cell size. And compared with the alternating-direction implicit (ADI) FDTD, the WCS-FDTD method is of higher accuracy and efficiency. Numerical results indicate that the CPU time for the WCS-FDTD method can reduced to about...
In this paper, one kind of subgrid techniques using physical connection between the main grid and subgrid is proposed. The physical space is composed of two fictitious spaces by equivalent principle. More details and accurate results in critical areas of interest are obtained by Huygens method replacing the wave equation on the interface of main grid and subgrid. Following physical principles rigorously,...
In this paper, one kind of subgrid technique using physical connection between different sizes cells is presented. Huygens method, one representation of equivalence principle, is employed to solve the problems of filed values on the interface of different size cells. This new technique could solve discontinuous structural electromagnetic problems.
In this paper, two-step sparse approximate inverse(SAI)-symmetric successive overrelaxation(SSOR) preconditioned generalised minimal residual (GMRES) algorithms are applied to solve the linear system of equations resulting from the 3-D CN-FDTD method for the simulation of the T junction microstrip circuit. The simulation results demonstrate that the two-step preconditioner can greatly accelerate the...
The increase of the time step size significantly deteriorates the property of the coefficient matrix generated from the Crank-Nicolson finite-difference time-domain (CN-FDTD) method. As a result, the convergence of classical iterative methods, such as generalized minimal residual method (GMRES) would be substantially slowed down. To address this issue, this paper mainly concerns efficient computation...
In this paper, several Krylov subspace iterative algorithms are proposed as the solvers for the unconditionally stable three-dimensional Crank-Nicolson finite-difference time- domain (3D CN-FDTD) method. To demonstrate features of this method, a resonant cavity is analyzed. Numerical results indicate that the GMRES method is the most efficient solver for the dielectric cavity. And while the time step...
An unconditionally stable Crank-Nicolson finite-difference time-domain (CN-FDTD) algorithm is presented for three-dimensional microwave circuit analysis. First, Mur's first-order absorbing boundary condition is applied this CN-FDTD algorithm. A symmetric successive over relaxation-preconditioned biconjugate-gradient algorithm is also proposed to solve the large sparse matrix equation obtained in the...
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