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Title: A USER-FRIENDLY COMPUTER CODE FOR RADIATED EMISSION AND SUSCEPTIBILITY ANALYSIS OF PRINTED CIRCUIT BOARDS
Abstract: A user-friendly computer code, PCB-MoM, that is intended to be used in EMC applications for predicting radiated emission and susceptibility of printed circuit boards (PCB) is presented. The formulation is based on an electric field integral equation (EFIE) expressed in the frequency domain. The EFIE is solved by the method of moments using two-dimensional pulse bsis functions and one-dimensional pulse test functions. In order to incorporate dielectric material in the substrate a spectral domain formulation is used. The code has been validated by comparison with previously published results and results obtained by other methods and codes.
Author(s): J. Carlsson, P-S. Kildal
File Type: Journal Paper
Issue:Volume: 14      Number: 1      Year: 1999
Download Link:Click here to download PDF     File Size: 609 KB

Title: A SPARSE ITERATIVE METHOD (SIM) FOR METHOD OF MOMENTS CALCULATIONS
Abstract: The Sparse Iterative Method (SIM) provides a faster solution to Method of Moments (MoM) matrix equations than does LU-decomposition with forward and back substitution. The SIM produces a solution with computational time proportional to N^2, as opposed to the N^3 time dependence associated with LU-decomposition. The SIM is implemented in an object oriented MoM program which is functionally equivalent to NEC2. In three examples, the SIM is shown to produce results as accurate as LU-decomposition. For dipoles, a flat wire grid and a generic three dimensional missle shape, the speed increase ranged from 3-30 times the speed of LU-decomposition; greater speed increases can be expected with electrically larger problems. The SIM requires no problem formulation changes, such as segment renumbering, and despite the fact that it is demonstrated for a wire MoM based on NEC2, it is general enough to be incorporated to any MoM formulation.
Author(s): A.P.C. Fourie, D.C. Nitch, A.R. Clark
File Type: Journal Paper
Issue:Volume: 14      Number: 1      Year: 1999
Download Link:Click here to download PDF     File Size: 630 KB

Title: RADIATION FROM 3D SOURCES IN THE PRESCENCE OF 2D COMPOSITE OBJECTS OF ARBITRARY CROSS-SECTIONAL SHAPE
Abstract: A method of moment code for computing the radiation from arbitrarily oriented narrow slots or straight dipoles in the vicinity of a two dimensional (2D) multi-region composite cylinder of arbitrary cross-sectional shape and infinite extension in the z-direction is developed. The dipoles and the slots are represented by known equivalent electric and magnetic currents distributions, respectively. The finite extent of the sources are included by Fourier transforming the equivalent electric and magnetic source currents along the infinite cylinder axis. The computed radiatiation patterns are compared to results computed by other methods and measurements. Radiation patterns are predicted both in the elevation and azimuthal planes.
Author(s): A.A. Kishk, P. Slattman, P-S. Kildal
File Type: Journal Paper
Issue:Volume: 14      Number: 1      Year: 1999
Download Link:Click here to download PDF     File Size: 612 KB