The use of digital filtering techniques for the simulation of fine features in EMC problems solved in the time domain

In this paper, the development and implementation of digital filters for the incorporation of fine features in time-domain electromagnetic codes is described. Examples are shown for the shielding effectiveness of equipment cabinets with perforated walls with/without printed circuit boards inside. Comparisons with measurements show excellent agreement. This approach results in substantial savings in computational storage, memory and in problem definition. Results were obtained by combining this technique with the transmission-line modeling method, but it can also be used in conjunction with other methods to simulate complex electromagnetic compatibility problems.

[1]  C. Christopoulos,et al.  Generalized material models in TLM .I. Materials with frequency-dependent properties , 1999 .

[2]  P. Sewell,et al.  Accurate wire representation in numerical models for high-frequency simulation , 2001 .

[3]  J. Bérenger.  A multiwire formalism for the FDTD method , 2000 .

[4]  Maurizio Bozzi,et al.  Efficient analysis of thin conductive screens perforated periodically with arbitrarily shaped apertures , 1999 .

[5]  Chao-Chun Chen,et al.  Transmission of Microwave Through Perforated Flat Plates of Finite Thickness , 1973 .

[6]  C. Christopoulos,et al.  Generalized material models in TLM .II. Materials with anisotropic properties , 1999 .

[7]  C. Christopoulos,et al.  The Transmission-line Modeling Method: TLM , 1995, IEEE Antennas and Propagation Magazine.

[8]  Carey M. Rappaport,et al.  A general method for FDTD modeling of wave propagation in arbitrary frequency-dispersive media , 1997 .

[9]  David W. P. Thomas,et al.  Generalized material models in TLM - part 3: materials with nonlinear properties , 2002 .

[10]  G. Mur.  Absorbing Boundary Conditions for the Finite-Difference Approximation of the Time-Domain Electromagnetic-Field Equations , 1981, IEEE Transactions on Electromagnetic Compatibility.

[11]  Trevor M. Benson,et al.  Simple and elegant formulation of scattering in TLM nodes , 1993 .

[12]  P. Sewell,et al.  New thin wire formulation for time‐domain differential‐equation models , 2002 .

[13]  Andy Marvin,et al.  Model of the electromagnetic fields inside a cuboidal enclosure populated with conducting planes or printed circuit boards , 2001 .

[14]  David Thomas,et al.  Time-Domain Simulation of Thin Material Boundaries and Thin Panels Using Digital Filters in TLM , 2002 .

[15]  E. Miller,et al.  Pole extraction from real-frequency information , 1980, Proceedings of the IEEE.

[16]  Nebojsa Doncov,et al.  TLM modelling of perforated thin metal screens , 2002 .

[17]  Andy Marvin,et al.  Analytical formulation for the shielding effectiveness of enclosures with apertures , 1998 .

[18]  Richard Holland,et al.  Finite-Difference Analysis of EMP Coupling to Thin Struts and Wires , 1981, IEEE Transactions on Electromagnetic Compatibility.

[19]  C. Christopoulos,et al.  A fully integrated multiconductor model for TLM , 1998, 1998 IEEE MTT-S International Microwave Symposium Digest (Cat. No.98CH36192).