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This paper presents the analysis of forced resonance characteristics of electrically small sized cavity with an external element and its application to measuring dielectric constants of low-loss dielectric materials. The forced resonance, series or parallel resonance, can be obtained by controlling the external reactance. The method of moments with Galerkin's procedure is used to determine the dielectric constant of the material. Numerical results show that the dielectric constants are determined simply by the adjusted reactance, and that the series resonance is more desirable for an actual measurement than the parallel resonance. In this paper, the Muller method is used to fmd the dielectric constant from the length of external reactance as an inversion algorithm. Experiments are also performed in terms of the dielectric materials with known dielectric constants, and it is demonstrated that the proposed measurement technique is useful for the low-loss dielectric materials.

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Abstract

Ⅰ. Introduction

Ⅱ. Principle of Dielectric Measurement by Forced Resonance

Ⅲ. Theoretical Basis

Ⅳ. Forward Resonant Length Formulation

Ⅴ. Retrieval of Dielectric Constant from Resonant Length

Ⅵ. Numerical and Experimental Results

Ⅶ. Conclusion

Acknowledgement

References

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UCI(KEPA) : I410-ECN-0101-2009-569-017763829