2023 Fiscal Year Final Research Report
Study on non-contact PIM measurement method considering the electromagnetic field distribution in practical system operation
| Project/Area Number |
21K04058
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 21020:Communication and network engineering-related
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| Research Institution | Yokohama National University |
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Principal Investigator |
Nobuhiro Kuga 横浜国立大学, 大学院工学研究院, 准教授 (80318906)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 移動体通信 / Passive Intermodulation / 無線通信 / 電波測定 / 雑音測定 / 非線形現象 |
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| Outline of Final Research Achievements |
We proposed a non-contact balanced measurement system that is suitable for evaluating the PIM characteristics of planar transmission lines and is compatible with conventional PIM measurements. Using nonlinear high-frequency circuit simulations, we quantitatively evaluated the impact of small impedance mismatches on PIM measurements. Additionally, we introduced TRL calibration into this PIM measurement system to propose a PIM estimation method that can eliminate the impact of mismatch loss. By analyzing the residual PIM effects of non-contact connectors, we identified that there exist sample dimensions where the residual PIM cancels each other out, and the generated PIM from sample is maximized. We also constructed a non-terminated measurement system based on this concept and examined its compatibility with the terminated method. As a result, it was shown that the maximum measured value of the non-terminated method is higher than that of the terminated method.
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| Free Research Field |
無線通信工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は、平面伝送線路であるマイクロストリップ線路のPIM特性評価において、平衡線路を測定系に導入することで、非接触で従来の測定方法と互換性のある新しい測定系を実現した点に意義がある。またPIM測定にTRLキャリブレーションを導入することで測定系での損失を校正し、より正確なPIM測定を可能としている。また、非接触コネクタの残留PIMを最小限に抑える技術は、平面伝送線路のPIM特性評価における公平な評価方法を示唆するものであり、測定標準化の観点から大きな意義がある。また終端法と互換のある無終端法の導入は、平面伝送線路のPIM特性評価における測定効率を劇的に向上させる意義がある。
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