Analysis of the Equivalent Source Reflection Coefficient and Limitations of K. Shimaoka’s Measurement Method

JIA Chao; ZHANG Yihang; CHEN Shuo; LI Yong; CUI Xiaohai

doi:10.12338/j.issn.2096-9015.2024.0090

Volume 68 Issue 8

Aug. 2024

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Article Navigation > Metrology Science and Technology > 2024 > 68(8): 32-37

JIA Chao, ZHANG Yihang, CHEN Shuo, LI Yong, CUI Xiaohai. Analysis of the Equivalent Source Reflection Coefficient and Limitations of K. Shimaoka’s Measurement Method[J]. Metrology Science and Technology, 2024, 68(8): 32-37. doi: 10.12338/j.issn.2096-9015.2024.0090

Citation:

JIA Chao, ZHANG Yihang, CHEN Shuo, LI Yong, CUI Xiaohai. Analysis of the Equivalent Source Reflection Coefficient and Limitations of K. Shimaoka’s Measurement Method[J]. Metrology Science and Technology, 2024, 68(8): 32-37. doi: 10.12338/j.issn.2096-9015.2024.0090

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Analysis of the Equivalent Source Reflection Coefficient and Limitations of K. Shimaoka’s Measurement Method

doi: 10.12338/j.issn.2096-9015.2024.0090

1.
National Institute of Metrology, Beijing 100029, China
2.
Henan University of Technology, Zhengzhou 450001, China

Received Date: 2024-03-18
Accepted Date: 2024-05-06
Rev Recd Date: 2024-05-06

Available Online: 2024-06-27

Publish Date: 2024-08-30

Abstract

Abstract

The equivalent source reflection coefficient plays a crucial role in microwave power measurement and uncertainty evaluation. This paper first discusses the relationship between the source reflection coefficient in amplitude-stabilized signal source systems and the equivalent source reflection coefficient when measuring power ratios using three-port devices. The concept of "equivalent" in the equivalent source reflection coefficient is explained from the perspective of the mismatch factor. Next, the working principle and limitations of K. Shimaoka's method for measuring equivalent source reflection coefficient using a network analyzer and three-port devices are briefly introduced. Finally, experiments and comparisons are conducted using N-type power dividers and directional couplers as measurement objects, based on K. Shimaoka's method and the traditional formula method in the 1-18 GHz frequency range. Results indicate that K. Shimaoka's method for measuring equivalent source reflection coefficient has certain limitations. Due to the small difference in transmission coefficients obtained in this calculation method, it is sensitive to minor changes and thus unsuitable for measuring equivalent source reflection coefficients when using three-port devices with good directionality (such as directional couplers).
- metrology,
- equivalent source reflection coefficient,
- directional coupler,
- power divider,
- K. Shimaoka method,
- directivity

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References(29)

References

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