Evaluation of Effective Conductivity of Copper-Clad Dielectric Laminate Substrates in Millimeter-Wave Bands Using Whispering Gallery Mode Resonators
Evaluation of Effective Conductivity of Copper-Clad Dielectric Laminate Substrates in Millimeter-Wave Bands Using Whispering Gallery Mode Resonators
复制标题
使用回音壁模式谐振器评估毫米波带覆铜电介质层压基板的有效电导率
DOI：
10.1587/transele.e92.c.1504
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
M. Ando
中科院分区：
文献类型：
--
作者：
T. Tran;Y. She;J. Hirokawa;K. Sakurai;Y. Kogami;M. Ando
本文介绍了一种测量毫米波范围内覆铜箔介质层压板基片有效电导率的方法。间接评估的电导率从测量的谐振频率和卸载的Q值的一些回音壁模式中激发的圆盘样品，其中包括一个大直径的20-30个波长的铜包电介质基板。因此，我们可以很容易地获得在很宽的频率范围内的有效电导率的频率依赖性的测试样品。预测了两种不同场分布的波导谐振器（铜包型和三明治型）的电导率几乎相同，具有自洽性，为该方法提供了重要依据。在55- 65 GHz频段测量了三种铜箔的电导率，其中电沉积铜箔的电导率小于轧制铜箔和双面光亮铜箔的电导率。电沉积铜箔的测量电导率随着频率的增加而减小。用该方法计算了由这些基片制作的微带线的电导率，并对微带线的传输损耗进行了准确的预测。
This paper presents a measurement method for determining effective conductivity of copper-clad dielectric laminate substrates in the millimeter-wave region. The conductivity is indirectly evaluated from measured resonant frequencies and unloaded Q values of a number of Whispering Gallery modes excited in a circular disk sample, which consists of a copper-clad dielectric substrate with a large diameter of 20-30 wavelengths. We can, therefore, obtain easily the frequency dependence of the effective conductivity of the sample under test in a wide range of frequency at once. Almost identical conductivity is predicted for two kinds of WG resonators (the copper-clad type and the sandwich type) with different field distribution; it is self-consistent and provides the important foundation for the method if not for the alternative method at this moment. We measure three kinds of copper foils in 55-65GHz band, where the conductivity of electrodeposited copper foil is smaller than that of rolled copper foil and shiny-both-sides copper foil. The measured conductivity for the electrodeposited copper foil decreases with an increase in the frequency. The transmission losses measured for microstrip lines which are fabricated from these substrates are accurately predicted with the conductivity evaluated by this method.