Techniques for measuring the electromagnetic shielding effectiveness of materials. II. Near-field source simulation

Shielding effectiveness relates to the ability of a material to reduce the transmission of propagating fields in order to electromagnetically isolate one region from another. Because the shielding capability of a complex material is difficult to predict, it often must be measured. A number of approaches to simulating far-field source are studied, including the use of coaxial transmission-line holders and a time-domain system. In each case, the system frequency range, test sample requirements, test field type, dynamic range, measurement time required, and analytical background are considered. Data taken on a common set of materials are presented. >

[1]  Robert A. Weck.  Thin-Film Shielding for Microcircuit Applications and a Useful Laboratory Tool for Plane-Wave Shielding Evaluations , 1968 .

[2]  Kendall Casey.  Low-Frequency Electromagnetic Penetration of Loaded Apertures , 1981, IEEE Transactions on Electromagnetic Compatibility.

[3]  M L Crawford.  Design, evaluation, and use of a reverberation chamber for performing electromagnetic susceptibility , 1986 .

[4]  Lawrence F. Babcock.  Computer Determination of Electromagnetic Wave Shielding Effectiveness , 1968 .

[5]  Eizo Hariya,et al.  Instruments for Measuring the Electromagnetic Shielding Effectiveness , 1984, 1984 International Symposium on Electromagnetic Compatibility.

[6]  G. Franceschetti,et al.  Steady state and transient electromagnetic coupling through slabs , 1979 .

[7]  Richard B. Schulz,et al.  Low-Frequency Shielding Resonance , 1968 .

[8]  Myron L. Crawford,et al.  Generation of Standard EM Fields Using TEM Transmission Cells , 1974 .

[9]  Mark Ma,et al.  Shielding-Effectiveness Measurements with a Dual TEM Cell , 1985, IEEE Transactions on Electromagnetic Compatibility.

[10]  A. N. Faught.  An Introduction to Shield Joint Evaluation Using EMI Gasket Transfer Impedance Data , 1982, 1982 IEEE International Symposium on Electromagnetic Compatibility.

[11]  William A. Stirrat.  USAECOM Contributions to Shielding Theory , 1968 .

[12]  S. Levy,et al.  Electromagnetic Shielding Effect of an Infinite Plane Conducting Sheet Placed between Circular Coaxial Coils , 1936, Proceedings of the Institute of Radio Engineers.

[13]  L. Zanforlin,et al.  Permittivity Measurements of Lossy Liquids at Millimeter-Wave Frequencies , 1983 .

[14]  P. Wilson,et al.  Shielding Effectiveness Measurements Using an Apertured TEM Cell in a Reverberation Chamber , 1986, 1986 IEEE International Symposium on Electromagnetic Compatibility.

[15]  N. Ari,et al.  Electromagnetic pulse (EMP) penetration through circular apertures in the frequency domain , 1985, Proceedings of the IEEE.

[16]  Daniel F. Higgins,et al.  A Comparison of Theoretical Expressions and Experimental Data for EM Penetration through Small Apertures , 1985, IEEE Transactions on Nuclear Science.

[17]  Robert B. Cowdell.  New Dimensions in Shielding , 1968 .

[18]  M.L. Crawford,et al.  A review of electromagnetic compatibility/interference measurement methodologies , 1985, Proceedings of the IEEE.

[19]  M. L. Crawford,et al.  Operational Considerations of a Reverberation Chamber for EMC Immunity Measurements - Some Experimental Results , 1984, 1984 National Symposium on Electromagnetic Compatibility.

[20]  Seymour B. Cohn,et al.  The Electric Polarizability of Apertures of Arbitrary Shape , 1952, Proceedings of the IRE.

[21]  R. Harrington,et al.  The Polarizabilities of Electrically Small Apertures of Arbitrary Shape , 1981, IEEE Transactions on Electromagnetic Compatibility.

[22]  H. E. Bussey.  Dielectric Measurements in a Shielded Open Circuit Coaxial Line , 1980 .

[23]  R. E. Collin,et al.  SMALL APERTURE COUPLING BETWEEN DISSIMILAR REGIONS , 1982 .

[24]  Dwayne R. Awerkamp.  Shielding Effectiveness of Filled Composites and Coated Plastics , 1981, 1981 IEEE International Symposium on Electromagnetic Compatibility.

[25]  W. T. Cathey.  Approximate Expressions for Field Penetration Through Circular Apertures , 1983, IEEE Transactions on Electromagnetic Compatibility.

[26]  T. Mo,et al.  Linear and Nonlinear EMP Diffusion Through a Ferromagnetic Conducting Slab , 1978, IEEE Transactions on Electromagnetic Compatibility.

[27]  J. Ronald Moser.  Low-Frequency Shielding of a Circular Loop Electromagnetic Field Source , 1967 .

[28]  P. F. Wilson.  A comparison between near-field shielding-effectiveness measurements based on coaxial dipoles and electrically small apertures , 1988 .

[29]  Peter R. Bannister.  Further Notes for Predicting Shielding Effectiveness for the Plane Shield Case , 1969 .

[30]  Peter R. Bannister,et al.  New Theoretical Expressions for Predicting Shielding Effectiveness for the Plane Shield Case , 1968 .

[31]  R N Clarke,et al.  Fabry-Perot and open resonators at microwave and millimetre wave frequencies, 2-300 GHz , 1982 .

[32]  J. T. Dowell,et al.  Shielding Material Insertion Loss Measurement Using a Dual TEM Cell System , 1983, 1983 IEEE International Symposium on Electromagnetic Compatibility.

[33]  R. F. Wallenberg,et al.  Advanced Composite Aircraft Electromagnetic Design and Synthesis , 1981, 1981 IEEE International Symposium on Electromagnetic Compatibility.