Time Domain Measurement of Material Permittivity and Permeability
Accurate knowledge of material complex relative permittivity (ε r = ε r ′ − jε r ″) and permeability (μ r = μ r ′ − jμ r ″) is required for just about any application utilizing the electromagnetic properties of materials. Applications that need precise information of the frequency dependence of ε r and μ r include design of radar absorbing material and RAM geometry, design of transmission line circuits on microwave substrates, and simulation and analysis of the propagation of electromagnetic waves in and through complex media. Frequency domain measurement of material properties are well known, and can be accomplished in a number of ways. These include lumped circuit and balanced bridge methods at low frequencies, and waveguide, TEM transmission line and resonant cavity methods for high frequencies1,2, and optical techniques. A comprehensive overview of material electromagnetic properties measurement techniques was recently presented by Afsar3. These techniques typically are conducted at low voltage and low electric field strengths, and assume that the material properties are independent of the field strength.
KeywordsPermeability Microwave Radar Convolution
Unable to display preview. Download preview PDF.
- 1.A. von Hippel, Dielectrics and Waves, Second Edition, ISBN 0–89006–803–8, Artech House, Boston (1995).Google Scholar
- 2.A. von Hippel, editor, Dielectric Materials and Applications, Second Edition, ISBN 0–89006–805–4, Artech House, Boston (1995).Google Scholar
- 3.N. Afsar, J.R. Birch, and R.N. Clarke, edited by G.W. Chantry, The measurement of the properties of - materials, Proceedings of the IEEE, vol. 74, no. 1, pp. 183–199 (1986).Google Scholar
- 4.M. Nicolson and G.F. Ross, Measurement of the intrinsic properties of materials by time-domain techniques, IEEE Trans. on Instr. and Meas., vol. IM-19, no. 4, pp. 377–382 (1970).Google Scholar
- 5.M. Nicolson, P.G. Mitchell, R.M. Mara, and A.M. Auckenthaler, Time domain measurement of microwave absorbers, Final Technical Report AFAL-7R-71–353, Air Force Avionics Laboratory, Air Force Systems Command, Wright-Patterson AFB, DTIC No. AD-892162 (1971).Google Scholar
- 6.R.F. Harrington, Time–Harmonic Electromagnetic Fields, ISBN 07–026745–6, McGraw–Hill, New York (1961).Google Scholar
- 7.G. Lederer, A transmission line method for the measurement of microwave permittivity and permeability, Memorandum 4450, Royal Signals and Radar Establishment (1990).Google Scholar
- 8.V. Churchill and J.W. Brown, Complex Variables and Applications, Fourth Edition, ISBN 0–07–0108730, McGraw–Hill, New York (1984).Google Scholar
- 9.A. Rizzi, Microwave Engineering – Passive Circuits, ISBN 0–13–586702–9, Prentice–Hall, Englewood Cliffs, NJ (1988).Google Scholar
- 12.S. Neelakanta, Handbook of Electromagnetic Materials, pg. 42, ISBN 0–8493–2500–5, CRC Press, Boca Raton, FL (1995).Google Scholar
- 13.Knoop, Infinite Sequences and Series, pg. 46, Dover Publications, Inc., New York (1956).Google Scholar