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Microwave dielectric spectrum of rocksA combination of several measurement techniques was used to investigate the dielectric properties of 80 rock samples in the microwave region. The real part of the dielectric constant, epsilon', was measured in 0.1 GHz steps from 0.5 to 18 GHz, and the imaginary part, epsilon'', was measured at five frequencies extending between 1.6 and 16 GHz. In addition to the dielectric measurements, the bulk density was measured for all the samples and the bulk chemical composition was determined for 56 of the samples. The study shows that epsilon' is frequency-dependent over the 0.5 to 18 GHz range for all rock samples, and that the bulk density rho accounts for about 50 percent of the observed variance of epsilon'. For individual rock types (by genesis), about 90 percent of the observed variance may be explained by the combination of density and the fractional contents of SiO2, Fe2O3, MgO, and TiO2. For the loss factor epsilon'', it was not possible to establish statistically significant relationships between it and the measured properties of the rock samples (density and chemical composition).
Document ID
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Ulaby, F. T.
(Michigan Univ. Ann Arbor., United States)
Bengal, T.
(Michigan Univ. Ann Arbor., United States)
East, J.
(Michigan Univ. Ann Arbor., United States)
Dobson, M. C.
(Michigan Univ. Ann Arbor., United States)
Garvin, J.
(NASA Goddard Space Flight Center Greenbelt, MD., United States)
Evans, D.
(Jet Propulsion Lab. California Inst. of Tech., Pasadena., United States)
Date Acquired
September 5, 2013
Publication Date
March 1, 1988
Subject Category
Report/Patent Number
NAS 1.15:89719
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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