The mixed-mode S-parameters have become widely used for transmission line measurements on printed circuit boards. In this article, the mixed-mode S-parameter measurement is applied to the site attenuation measurement using a pair of dipole antennas. The proposed method requires no balance–unbalance transformer (balun) for the balancing antenna measurement and is free from the limitation of the antenna operating frequency caused by the balun. Compared with conventional methods, 20-dB smaller site attenuation between the dipole antenna pair was obtained. This results in expansion of the measurement frequency and enables us to carry out time-domain measurements with higher time resolution. Since no additional circuit, such as a matching circuit is necessary for the proposed method, the ring-down time of the main response is much shorter. These characteristics lead to significant advantages in carrying out precision measurements.

中文翻译：

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时域混合模式站点衰减测量

混合模式 S 参数已广泛用于印刷电路板上的传输线测量。在本文中，混合模式 S 参数测量应用于使用一对偶极子天线的站点衰减测量。所提出的方法不需要平衡-不平衡变压器（balun）来进行平衡天线测量，并且不受由巴伦引起的天线工作频率的限制。与传统方法相比，偶极天线对之间的站点衰减小 20 dB。这导致测量频率的扩展，并使我们能够以更高的时间分辨率进行时域测量。由于所提出的方法不需要附加电路，例如匹配电路，因此主响应的振铃时间要短得多。