The complex permittivity of liquids is measured with a microwave cavity. The measurements are conducted for the TE111, TE112, TM010, and TM011 modes in a circular cylindrical cavity. The loss tangent of the dirty oil (after 6000 mi) is found to be three times higher than the one of the clean oil. The relative dielectric constant is not noticeably effected.
CITATION STYLE
Kajfez, D., Reed, M. W., & Smith, C. E. (1999). Loss tangent of motor oil at 10 GHz. Microwave and Optical Technology Letters, 21(1), 15–18. https://doi.org/10.1002/(SICI)1098-2760(19990405)21:1<15::AID-MOP5>3.0.CO;2-9
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