Measurement of Permittivity and Permeability of Material Using Transmission/Reflection Method

• Main Authors: Yan, San-Ji, 顏三集
• Other Authors: Fuh, Kuen-Fwu
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/ysm7gy

碩士 === 國立聯合大學 === 電子工程學系碩士班 === 105 === In this study, improved extraction procedures for permittivity and permeability were incorporated into the conventional Nicolson-Ross-Weir Transmission/Reflection (NRW TR) method. First, a phase unwrapping algorithm was developed to resolve the phase discontinuities occurred at half-wavelength resonance frequencies, and the singularity of group delay calculations of the NRW algorithm was then eliminated. The phase unwrapping algorithm can also help recovering the reference-plane rotation of measured S_11 and S_22; the position and intrinsic S-parameters of material under test, therefore, can be accurately determined. The 7mm beadless coaxial airline was adapted as the test fixture. The permittivities and permeabilities of several dielectrics and magnetic materials were extracted by the new procedure and the conventional NRW method; and the advantages and deficiencies of both methods were compared. The extracted dispersive permittivities and peameabilities were refined by the Levenberg–Marquardt optimization method to remove the uncertainties caused by residual measurement errors. The uncertainties of extracted permittivity and permeability due to S-parameters measurement and sample length were also investigated.