本論文致力於研究應用於射頻干擾檢測之複數近場量測技術，以本實驗室開發之複數近場量測系統為背景將其應用於電磁相容、差動訊號平衡性驗證以及射頻訊號干擾等領域。為了研究差動傳輸線在電路佈局上會遭遇的非理想效應，製作了四組差動傳輸線進行比較，分別為一般結構之差動傳輸線、接地面結構不完整之差動傳輸線、一對45度轉角之差動傳輸線以及複合式轉角之差動傳輸線，藉以比較缺陷接地面與轉角不平衡結構對差動訊號平衡性、共模雜訊輻射等現象產生的影響，並且討論複數近場量測比起傳統量測法能夠提供哪些不同的資訊。除此之外，為了使複數近場量測能用於實際之產品上，開發了接收模式的複數近場量測系統，藉由電路中提取出的時脈訊號之諧波做為參考訊號，利用網路分析儀的接收模式來得到待測物的平面磁場分佈，提出校正方法並驗證可靠性；最後以一個市售的無線路由器模組作為待測物，成功實現複數近場量測系統應用於實際之無線通訊產品之目的。

This thesis focuses on the applications of complex near-field measurement technology base on the field scan system developed by our laboratory. The presented applications include electromagnetic compatibility, differential signaling, and radio frequency interference. In order to study the effect of non-ideal differential line layout, four cases of differential lines are used. Defected ground and bend structures are also studied in order to compare their effects on the magnitude and phase imbalance of signals. In addition, the difference between traditional near-field measurement and proposed complex near-field measurement is discussed. For the purpose of measuring practical electric products, receiver-mode complex near-field measurement system is developed. Through the receiver-mode function in network analyzer, the external reference signal provided by the electric product can be used in this system to measure the near magnetic fields. Moreover, the associated method of calibration is presented in this thesis and verified by the normal operation of network analysis. Finally, complex near magnetic fields are measured on a commercial wireless router with the help of this system.

論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖目錄 vii
表目錄 xi
第一章 緒論 1
1.1 研究背景與技術現況 1
1.2 檢測方法介紹 4
1.3 論文章節 6
第二章 利用複數近場量測技術進行差動訊號平衡性分析 7
2.1 複數近場量測系統 7
2.1.1 量測系統簡介 8
2.1.2 磁場探針校正 11
2.1.3 系統靈敏度 14
2.2 實驗設計與量測結果 15
2.2.1 差動傳輸線設計 16
（1）耦合微帶線 16
（2）混合模態散射參數 18
2.2.2 量測結果與模擬之比對與驗證 21
2.3 差動訊號平衡性分析 32
2.3.1 最大瞬間水平磁場振幅與相位 32
2.3.2 遠場輻射強度 36
第三章 應用接收模式的複數近場量測技術 40
3.1 操作於接收模式的複數近場量測系統 41
3.1.1 系統架構 41
3.1.2 校正方法及其驗證 41
3.1.3 接收模式的系統靈敏度 46
3.2 無線通訊產品量測應用 48
3.2.1 待測物簡介 49
3.2.2 量測結果 51
3.3 實驗結果分析 55
第四章 結論 58
參考文獻 59

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