In this article, permittivity measurement based on open resonator technology is reviewed, and then, the hemispherical open resonator with an enlarged aperture on the curved mirror is proposed for high-frequency applications. A numerical compensate method based on frequency deviation is first proposed in detail for permittivity correction. To verify our idea, an open resonator is designed and fabricated over the frequency from 26 to 40 GHz, and some materials with known characteristics are measured based on proposed technology. The complex permittivity measurement of two transparent materials, polydimethylsiloxane (PDMS) and cyclic olefin copolymer (COC), are studied at 260 GHz. Measured results are compared with previous ones, and the discussion is provided, which shows that the proposed method probably is an efficient way for complex permittivity measurement at high frequency up to terahertz.

中文翻译：

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太赫兹透明材料测量用开式谐振器介电常数测量的回顾与改进

本文综述了基于开式谐振腔技术的介电常数测量，然后针对高频应用提出了在曲面镜上增大孔径的半球形开式谐振腔。首次详细提出了一种基于频偏的数值补偿方法进行介电常数校正。为了验证我们的想法，我们在 26 至 40 GHz 的频率范围内设计并制造了一个开放式谐振器，并根据提议的技术测量了一些具有已知特性的材料。在 260 GHz 下研究了两种透明材料聚二甲基硅氧烷 (PDMS) 和环烯烃共聚物 (COC) 的复介电常数测量。将测量结果与以前的结果进行比较，并提供了讨论，