
J. Jpn. Soc. Soil Phys.

No. ++*, p. +-,- ,**2



²³´*ῌwgµ¶**ῌ·¸¹'***ῌº»¼½***
Dielectric Properties of Clays in Microwave Frequency
Hideki MIYAMOTO*, Takashi SHIMOMACHI**, Jiro CHIKUSHI*** and Eriko YASUNAGA**** Graduate School of Education, Saga University, + Honjo-machi, Saga city, Saga 2.*ῌ2/*,, Japan** Faculty of Environmental Studies, Nagasaki University, +ῌ+. Bunkyo-machi,
Nagasaki city, Nagasaki 2/,ῌ2/,+, Japan*** Biotron Institute, Kyushu University, 0ῌ+*ῌ+ Hakozaki, Higashi-ku,
Fukuoka city, Fukuoka 2+,ῌ2/2+, Japan
Abstract
Time domain reﬂectometry (TDR), measuring dielectric properties, has widely been applied
to monitor volumetric water content (q) and bulk electrical conductivity (sb) in soil. TDR is,
however, not applicable to clays due to the inadmissible energy loss of emitted microwave signals. To reveal the response of the clays to the signals, by using a vector network analyzer wemeasured the spectra of real (e῍) and imaginary (e8) part of complex permittivity in the frequencyof *.+ to -.* GHz for kaolinite and bentonite having di#erent q-values. Besides the distinct e8- ande8-spectra for q, for kaolinite we found that the relation of e῍ versus q can be given by a uniqueexpression within a range of examined frequency, and sb can be estimated from e8-values ataround *.- GHz with relatively small errors.

Although the sb values for the bentonite, estimatedby the present method, included unacceptable large errors, the relations of e῍ versus q wereadequately determined in whole examined frequencies.

Judging from the gradient of e῍-q

relations for bentonite, we suggested that the signals with higher frequency should provide moresensitive determination of q than that with lower frequencies.
Key words : Dielectric relaxation spectroscopy, Real and imaginary part of complex permittivity,
Frequency, Volumetric water content, Electrical conductivity+
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17

CaCl,  sact ῌ scalFig. .



Electrical conductivity (scal) estimatedfrom equation (-) for actual electricalconductivity of CaCl, solutions (sact).

Spectra of the component of electricalconductivity (eiῌ) for CaCl, solutions.
The component of orientational polarization (ep) is also shown in the ﬁgure.

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18

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19

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permittivity (eῌ) for (a) kaolinite and (b)bentonite.

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di#erent volumetric water content (q).

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Bulk electrical conductivity (sb) forvolumetric water content (q) for kaolinite and bentonite.

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21

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5 &H!

EF +333 : Y% http : //atom++.phys.ocha.ac.jp/ftp/pub/tdr/TDR-guide.pdf(veriﬁed 0 March. ,**2).
Arroyo, F. J., Carrique, F., Jiménez-Olivares, M.L. andDelgado, A.V. (,***) : Rheological and electro-£¤l¥¦ h "# # } 4

kinetic properties of sodium montmorillonite

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!/ e ῎ 'P!

QR#H/-

sion. J. Colloid Interface Sci., ,,3 : ++,ῌ+,,.

U N;,M1;{| \4K q 

Campbell, J.E. (+33*) : Dielectric properties and inﬂ-¡OLjl§M0U'~XH; Uj

uence of conductivity in soils at one to ﬁfty

'0U^h QR^M¨ pqr] \megahertz. Soil Sci. Soc. Am. J., /. : --,ῌ-.+.

 q ' N O e ῎  q j©  I0Ulª O 

Dalton, F.N. and van Genuchten, M.Th. (+320) : The N; 9 ^_`4abcdl0s

time-domain reﬂectometry method for measur-*.- GHz  e 1*+ -.῍ «¬­

ing soil water content and salinity. Geoderma,345 sb '-0UªO-2 : ,-1ῌ,/*.

O V[\] \) 9 ^_`4abcd

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reﬂectometry calibration for uniformly and non-) e 1JM sb '"!®I0Ul

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} ·¸^"®¸¹JM º»¼)C
(k1 N; 34

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5I

Fernando, M. J., Burau, R.G. and Arulanandan, K.

.!/ kM 8l()U½RO.

(+311) : A new approach to determination of HJH lM  Y% Z) TDR l4

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BCDE +,3ῌ+., FGHIJKL MN

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23

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