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A Study on the Errors for the Improved Version of the Virtual Transmission-Line Model  

조유선 (한국과학기술연구원 영상미디어연구센터)
김세윤 (한국과학기술연구원 영상미디어연구센터)
김영식 (고려대학교 전파공학과)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.13, no.10, 2002 , pp. 971-981 More about this Journal
Abstract
An open-ended coaxial probe method has been considered as one of effective tools for measuring electrical properties of its contacted material without shaping and fitting. The measured reflection coefficient at the probe's end is able to convert into the corresponding complex permittivity by employing the improved version of virtual transmission-line model Presented by our lab already. But the error of complex permittivity converted by equivalent model increases as the operating frequency ascends high. The errors of complex permittivity in the open-ended coaxial probe can be yielded compositively by the imperfect contact or probe, manufacture error of probe and complex permittivity error of reference material etc. Therefore it is necessary to limit the problem to identify the error causes in high frequency. In this paper, the errors which are resulted from the measurement of reflection coefficient are removed by using the FDTD(Finite-Difference Time-Domain) method, the error causes are limited the conversion model problem. And the error study of the improved conversion model is performed from several viewpoints. At first, the local minimum of parameter to be calculated by the iteration method in the conversion model is checked. At second, the modeling of the equivalent model is checked in the frequency range. From this study, we know the valid range of the improved conversion model.
Keywords
Complex Permittivity; Error of Conversion Model; Local Minimum; Equivalence;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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