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A Free-Space Measurement Technique of Terahertz Dielectric Properties

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Abstract

The free-space method for material dielectric characterization in the microwave band is extended to terahertz frequencies. By analyzing the advantages and disadvantages of the relative permittivity of the transmission/reflection method for non-magnetic materials, a fast calculation method using a transmission-only method is proposed. Based on the convergence analysis of the algorithm, a method to estimate the initial value is also proposed. Finally, through measurements of the permittivity of high-density polyethylene, polystyrene, polypropylene, and polymethyl methacrylate in the 325–500 GHz band, we verify the rationality of the algorithm and demonstrate its applicability. Through the combination of the two methods, the terahertz dielectric properties of a majority of flat non-conducting solid materials and non-polar liquid materials can be measured.

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Acknowledgements

This work is supported by the Department of Science and Technology of Shandong Province (Project Numbers 2015GGX101030 and 2016GGX101010), the Ministry of Science and Technology of China (Project Number 2015DFA11200), and the Shandong Provincial Natural Science Foundation (Project Number ZR2014FP007), the Youth Science Funds of Shandong Academy of Sciences, and the Innovation Program of the Shandong Academy of Sciences.

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Authors and Affiliations

  1. Institute of Automation, Shandong Academy of Sciences, Jinan, Shandong, 250014, China

    Xiansheng Zhang, Tianying Chang, Zhonglin Sun, Chuanfa Yang, Xiuwei Yang & Lingyu Liu

  2. College of Instrumentation and Electrical Engineering, Jilin University, Changchun, Jilin, 130061, China

    Tianying Chang, Hong-Liang Cui & Wei Fan

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  1. Xiansheng Zhang
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  2. Tianying Chang
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  3. Hong-Liang Cui
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  4. Zhonglin Sun
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  5. Chuanfa Yang
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  6. Xiuwei Yang
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  7. Lingyu Liu
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  8. Wei Fan
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Correspondence to Tianying Chang.

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Zhang, X., Chang, T., Cui, HL. et al. A Free-Space Measurement Technique of Terahertz Dielectric Properties. J Infrared Milli Terahz Waves 38, 356–365 (2017). https://doi.org/10.1007/s10762-016-0341-2

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