基于单传输线标准件的两端口VNA传播常数测量
Propagation Constant Measurement Based on a Single Transmission Line Standard Using a Two-port VNA
AI总结：
本研究提出一种无需预校准两端口VNA的单传输线传播常数测量方法，通过沿传输线移动未知网络模拟多线标准件，经三台VNA验证测量结果一致，消除连接器重复误差并提升SI溯源性。
摘要：
本研究提出了一种利用单传输线标准件测量传输线传播常数的新方法，且无需预先对两端口矢量网络分析仪（VNA）进行校准。该方法通过模拟多线校准方法的多个线标准件来获得准确结果，每个线标准件通过沿传输线移动一个未知网络来实现。该网络无需对称或互易，但必须同时具备透射和反射特性。我们使用平板同轴空气线进行了测量，并在三台不同的VNA上重复了实验，所有VNA测得的平板同轴空气线传播常数几乎一致。通过避免断开或移动电缆，该方法消除了与连接器重复性相关的误差，提升了宽带测量对国际单位制（SI）的溯源性。
英文摘要：
This study presents a new method for measuring the propagation constant of transmission lines using a single line standard and without prior calibration of a two-port vector network analyzer (VNA). The method provides accurate results by emulating multiple line standards of the multiline calibration method. Each line standard is realized by sweeping an unknown network along a transmission line. The network need not be symmetric or reciprocal, but must exhibit both transmission and reflection. We performed measurements using a slab coaxial airline and repeated the measurements on three different VNAs. The measured propagation constant of the slab coaxial airline from all VNAs is nearly identical. By avoiding disconnecting or moving the cables, the proposed method eliminates errors related to repeatability of connectors, resulting in improved broadband traceability to SI units.
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