Dielectric materials play a supporting role for electronic circuits. With the development of 5G millimeter wave communication, precision measurement of dielectric property becomes increasingly important. This paper introduces a free-space quasi-optical spectroscopy for complex dielectric property measurement. This spectroscopy can work in both transmission and reflection modes to accommodate both low-loss and high-loss materials. By applying the transfer matrix theory, both solid and liquid samples can be characterized using this system. In addition, the system employs a Gaussian telescope design, giving a possibility of broadband operation. Furthermore, this system is much simpler in calibration compared to other systems. A detailed description of the quasi-optical system is presented. Four materials are measured in the E-band (60–90 GHz). De-ionized water is also measured to represent liquid substrates in electronic circuits. The measurement is in good agreement with published data within a discrepancy of 5%.

中文翻译：

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固态和液态样品的宽带准光学介电谱

介电材料在电子电路中起辅助作用。随着5G毫米波通信的发展，介电性能的精确测量变得越来越重要。本文介绍了一种用于复杂介电性能测量的自由空间准光学光谱学。这种光谱可以在透射和反射模式下工作，以适应低损耗和高损耗材料。通过应用转移矩阵理论，可以使用该系统对固体和液体样品进行表征。此外，该系统采用高斯望远镜设计，可以进行宽带操作。此外，与其他系统相比，该系统的校准要简单得多。给出了准光学系统的详细描述。在E波段（60–90 GHz）中测量了四种材料。还测量了去离子水，以代表电子电路中的液体基质。该测量与发布的数据相差不超过5％。