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Equivalent Source Reflection Coefficient and Its Online Measurement Method
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摘要: 为解决器件不可拆分导致的等效源反射系数无法测量问题，提出了一种基于纹波法原理的等效源反射系数在线测量方法。该方法不需要多根匹配/失配空气线或更复杂的测量器件，仅采用一根匹配空气线和一个失配功率座就能够实现宽频带等效源反射系数在线测量，具有简单高效的优点。推导了稳幅情况下源反射系数和利用功率传递标准时等效源反射系数的表达式，并从失配因子的角度解释了源反射系数中“等效”的含义；分析了失配对于功率比值测量结果的影响，并通过失配因子获得等效源反射系数的在线测量方法。在1~18GHz频段内，以商用功率传递标准作为测试对象对在线测量方法进行了实验验证。结果表明，测量值满足预期指标且符合整体变化趋势，有力验证了该方法的可行性，为开展更宽频带的等效源反射系数在线测量方法研究提供了参考。Abstract: To tackle the inability to measure the equivalent source reflection coefficient due to inseparable components, a new online measurement method for equivalent source reflection coefficient, based on the ripple method, is proposed. This method avoids the need for numerous matched/mismatched airlines or complex measuring devices. Instead, it employs a single matched airline and one mismatched power sensor to conduct a broad frequency band measurement of the equivalent source reflection coefficient, showcasing its simplicity and efficiency. The paper derives the expressions for the source reflection coefficient under amplitude stabilization and the equivalent source reflection coefficient when utilizing a power transfer standard. Furthermore, it elucidates the notion of "equivalence" in the source reflection coefficient from the perspective of the mismatch factor, analyses the effect of mismatch on power ratio measurement results, and proposes an online measurement method for equivalent source reflection coefficient through the mismatch factor. Experiments are conducted on a commercial power transfer standard within the 1-18GHz frequency range. The results meet expected indices and conform to the overall trend, thereby validating the feasibility of this method. The method serves as a reference for further research into wider bandwidth online measurement methods for the equivalent source reflection coefficient.
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图 3 采用失配空气线组合体结构的等效源反射系数在线测量方法的原理图
Figure 3. Schematic diagram of the online measurement method of equivalent source reflection coefficient using a mismatched airline combination
图 4 采用失配空气线组合体结构的等效源反射系数测量方 法的实验示意图
Figure 4. Experimental setup of the measurement method for the equivalent source reflection coefficient using a mismatched airline combination
图 5 开环条件下，功率与功率比值随频率变化趋势图
Figure 5. Trend of power and power ratio changes with frequency under open loop conditions
图 7 等效源反射系数的在线测量值与厂商相关数值比较
Figure 7. Comparison between online measurement values of the equivalent source reflection coefficient and related values from manufacturer
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