Broadband Dielectric Constant Extraction Method Based on Coplanar Waveguide Transmission Line
XU Sen-feng1,ZHAO Wei2
1. The 13th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang, Hebei 050051, China
2. Xidian University, Xi’an, Shaanxi 710071, China
Abstract：A broadband method of extracting dielectric constant of low-loss materials based on coplanar waveguide transmission line is introduced. Fabricated five transmission lines as test sample and measured the raw data by vector network analyzer. After calculating the propagation constant from measurements of five line lengths based on multiline TRL apply an analytic CPW model to extract the broadband dielectric material properties of the substrate material GaAs from 0.1GHz to 50GHz.Contrast to conventional resonator measurement method with single frequency test and complex construct, the proposed method can make continuous broadband test with more efficient. The results show excellent agreement between these two methods, the difference is within ±2.5%, and meet the need of engineering design.
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2022, Vol. 43 
