Abstract
AbstractFor efficient measurement of the material parameters of a lossy sheet material used for absorption and shielding of electromagnetic waves, a nondestructive measurement method of a complex relative permittivity ϵr by a coaxial electrode has been proposed. In this method, a flanged opening of a coaxial cable is placed on the surface of a conductor‐backed sheet. From the measured reflection coefficient, the value of ϵr is obtained. In reality, however, contacts at both sides of the sheet are not perfect.In this paper, an analysis is carried out in which air gaps are assumed on both sides of the sample and the effect on the complex permittivity measurement is studied. First, the variation of the reflection coefficient vs. the gaps on the sample surfaces and the complex relative permittivity are obtained experimentally so that the effect of the gap is studied.Next, an estimation error of ϵr is derived when the uncertainty of the gap and the reflection coefficient is considered as the cause of the error. It is demonstrated that the accuracy of the present method can be better than that in the conventional transmission line method depending on the conditions. Also described is the effect of reducing the error in the case where gaps are placed at the contact planes so that the measurement is made noncontacting.
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