Title :
Measurement of the shielding properties of composite materials: comparison of the dual TEM and noncontact probe methods
Author :
Gardner, C.L. ; Poissant, Y.F.C.
Author_Institution :
Defence Res. Establ., Ottawa, Ont., Canada
fDate :
11/1/1998 12:00:00 AM
Abstract :
A comparative study has been made of the use of a noncontact probe method and the dual TEM cell method for the measurement of the surface impedance of composite materials. The results show that the values of surface impedance obtained by the two methods are in substantial agreement when the samples are pseudo-isotropic. Very different results are obtained by the two methods, however, when the samples are anisotropic because the two techniques induce a different flow of current (circular in the case of the noncontact probe method and laminar in the case of the dual TEM method). Comparison of the results from the two methods has shed light on the structure of carbon composite materials
Keywords :
anisotropic media; carbon fibre reinforced composites; electric current; electric impedance measurement; magnetic shielding; materials testing; probes; test facilities; anisotropic samples; carbon composite materials; circular current flow; dual TEM cell method; epoxy matrix; laminar current flow; magnetic field shielding; noncontact probe method; pseudo-isotropic samples; shielding properties measurement; surface impedance measurement; Aerospace materials; Antenna measurements; Composite materials; Conducting materials; Impedance measurement; Magnetic field measurement; Magnetic shielding; Probes; Surface impedance; TEM cells;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
