We propose a broadband conductivity measurement method in the millimeter-wave bands using a balanced-type circular disk resonator (BCDR). Because of the unique feature of the BCDR’s mode selective behavior over a wide band, the proposed technique can provide broadband conductivity measurements from less than 20 GHz up to over 100 GHz with a single closed-type resonator utilizing higher order mode resonances. We consider three measurement scenarios for the proposed BCDR-based broadband conductivity measurements. First, we discuss the absolute measurements of copper conductivity and then consider the relative conductivity measurements for metallic disks with reference to copper conductivity obtained in the first scenario. Finally, the second scenario is extended to the interface conductivity measurements of copper-clad substrates. The proposed measurement scenarios are demonstrated both numerically and experimentally in the millimeter-wave bands with uncertainty evaluations. The proposed technique can contribute to the development of advanced materials and implementation processes of planar circuits for various millimeter-wave applications, including 5G and 6G.

中文翻译：

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使用平衡型圆盘谐振器的毫米波段宽带电导率测量技术

我们提出了一种使用平衡型圆盘谐振器 (BCDR) 的毫米波段宽带电导率测量方法。由于 BCDR 在宽带上的模式选择行为的独特特征，所提出的技术可以提供从小于 20 GHz 到超过 100 GHz 的宽带电导率测量，使用高阶模式谐振的单个封闭型谐振器。我们为提议的基于 BCDR 的宽带电导率测量考虑了三种测量方案。首先，我们讨论铜电导率的绝对测量值，然后参考在第一种情况下获得的铜电导率来考虑金属盘的相对电导率测量值。最后，第二种情况扩展到覆铜基板的界面电导率测量。所提出的测量方案在毫米波波段进行了数值和实验验证，并进行了不确定性评估。所提出的技术有助于开发用于各种毫米波应用（包括 5G 和 6G）的平面电路的先进材料和实现工艺。