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Complex Dielectric Constant as a Function of Frequency for a Liquid Hydrocarbon Fuel in the Microwave Region

Published online by Cambridge University Press:  15 February 2011

Donald A. Wiegand
ARDEC, Picatinny Arsenal, NJ
Frank Murray
General Dynamics, Pomona, CA
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The incident, reflected and transmitted powers were measured and the reflection and transmission coefficients calculated for a liquid fuel. Two sizes of double ridge waveguide were used to cover the frequency ranges 2.5 to 7.5 and 7.5 to 18 GHz and corrections were made for waveguide losses. Strong interference effects were observed and the real part of the dielectric constant, ε', was obtained primarily from the separation of interference maxima and minima while the loss tangent, ε“/ε', was obtained by curve fitting to the normalized power loss. The final values of ε′ and ε“/ε′ were determined at each frequency by minimizing the difference between the experimental and theoretical values of the reflection coefficient and the normalized power loss. With increasing frequency ε' decreases and then becomes constant while ε“/ε' decreases throughout the frequency range within experimental accuracy.

Research Article
Copyright © Materials Research Society 1994

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1. Surber, W. H. Jr, J. Appl Phys 19, 514 (1948).Google Scholar
2. Tinga, W. R. and Edwards, E. M., J Microwave Power 3(3), 114 (1968).Google Scholar
3. Klein, A., Archiv fur Elektronik und Übertragungstechnik 31, 501 (1977).Google Scholar
4. Hollis, M. A., Blackman, C. F., Weil, C. M., Allis, J. W. and Schaefer, D. J., IEEE Trans on Microwave Theory and Technique MTT-287, 791 (1980).Google Scholar
5. Murray, F., Helling, G., Wiegand, D. A. and Pinto, J., Proc of the Fifth National Conference on High Power Microwave Technology, edited by Brown, E. A., Kaul, R. and Libelo, L., (Published by Science and Technology Corp, Hampton, VA, 1990) pp 481484.Google Scholar
6. Wiegand, D. A. and Murray, F., Technical Report ARAED-TR-92023 (1993).Google Scholar
7. Wiegand, D. A. and Murray, F., presented at the 1992 Symposium on Microwave Processing of Materials III, MRS Spring Meeting, San Francisco, CA (1992).Google Scholar
8. Ramo, S. and Whinnery, J. R., Fields and Waves in Modern Radio, 2nd ed. (John Wiley & Son, New York 1964), Cpt 7 and 9.Google Scholar
9. Born, M. and Wolf, E., Principles of Optics, (Pergamon Press, New York 1959), p 627 Google Scholar
10. Wiegand, D. A. and Murray, F., to be published.Google Scholar
11. Hasted, J.B., Aqueous Dielectrics (Chapman and Hall, London 1973) pp 4345.Google Scholar