Page 580 - Engineering Electromagnetics, 8th Edition

C APPENDIX

Material Constants

Table C.1 lists typical values of the relative permittivity or dielectric constant for

r
common insulating and dielectric materials, along with representative values for the
loss tangent. The values should only be considered representative for each mate-
rial, and they apply to normal temperature and humidity conditions and to very low
audio frequencies. Most of them have been taken from Reference Data for Radio
1
2
Engineers. The Standard Handbook for Electrical Engineers, and von Hippel, 3
and these volumes may be referred to for further information on these and other
materials.
Table C.2 gives the conductivity for a number of metallic conductors, for a
few insulating materials, and for several other materials of general interest. The
values have been taken from the references listed previously, and they apply at
zero frequency and at room temperature. The listing is in the order of decreasing
conductivity.
Some representative values of the relative permeability for various diamagnetic,
paramagnetic, ferrimagnetic, and ferromagnetic materials are listed in Table C.3.
They have been extracted from the references listed previously, and the data for the
ferromagnetic materials is only valid for very low magnetic flux densities. Maximum
permeabilities may be an order of magnitude higher.
Values are given in Table C.4 for the charge and rest mass of an electron, the
permittivity and permeability of free space, and the velocity of light. 4

1 International Telephone and Telegraph Co., Inc.: Reference Data for Radio Engineers, 7th ed.,
Howard W. Sams & Co., Indianapolis, IN, 1985.
2 See References for Chapter 5.
3 von Hippel, A. R. Dielectric Materials and Applications. Cambridge, Mass. and New York: The
Technology Press of the Massachusetts Institute of Technology and John Wiley & Sons, 1954.
4 Cohen, E. R., and B. N. Taylor. The 1986 Adjustment of the Fundamental Physical Constants.
Elmsford, N.Y.: Pergamon Press, 1986.

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