本論文將探討兩導體間產生的電場耦合或磁場耦合，其抑制方法可將受干擾的導體加以屏蔽，屏蔽體必須依電場或磁場耦合作單端接地或双端接地。此外，並探討絞線及屏蔽絞線抑制磁場之效果。
當電路受到近場中的電場或磁場干擾時，可利用電磁屏蔽之抑制方式，金屬隔板對電場及磁場均會產生屏蔽效用，其屏蔽效用係以屏蔽效能 表示之，屏蔽效能中包括反射損失 及吸收損失 。論文中並比較不同的導電係數 及導磁係數 的銅隔板、鋁隔板、不銹鋼板及鍍鋅鋼板對磁場的屏蔽效用。
電路的接地方式可分為安全接地及信號接地。安全接地可防止人體接觸電路或系統時發生觸電危險；信號接地為提供電流一個低阻抗的回流路徑。信號接地可分為單點接地、多點接地及混合式接地。若接地不當，則容易引起地雜訊電流之干擾，必須利用屏蔽變壓器、光耦合器、共模扼流圈或平衡電路抑制雜訊。
量測傳導性雜訊時，須以線阻抗穩定網路(LISN)抑制市電端之雜訊干擾，並利用雜訊分離器量測被測試電路之共模電流及差模電流。本論文係針對線阻抗穩定網路與雜訊分離器，分析其電路動作原理。此外，吾人亦探討線濾波器抑制傳導性雜訊之原理，並提出線濾波器之設計流程。
本論文係以探討雜訊之理論分析及實作驗證為主要架構。提供工程師在實作上遇到雜訊干擾時，可針對雜訊之來源及傳導路徑以採取適當的抑制方法。

The coupling behaviors of the electric or magnetic fields between two conductors are investigated in this thesis. Shielding the conductor is necessary to avoid the coupling interferences. The shields must be arranged with single-end or two-end grounded depend on the electric or magnetic coupling. In addition, the magnetic coupling suppression for twisted and shielded twisted pairs are also investigated in this thesis.

In the near fields, the cable shielding is used to suppress the electric or magnetic interferences. Metal plates are employed to shield the electromagnetic field. Shielding is evaluated by shield effectiveness (SE) of the materials. It includes reflection loss (R) and absorption loss (A). The magnetic field shielding effectiveness for various metallic sheets with different conductivity and permeability are presented and compared in the thesis. The shield materials are copper, aluminum, stainless steel, and galvanized sheet.

Grounding is classified into two categories: safety ground and signal ground. Safety grounds are required to prevent human beings from electric shock hazards. Signal grounds are defined as a low-impedance path for current to return to the source. Signal grounds usually fall into one of three categories: single-point grounds, multipoint grounds and hybrid grounds. If grounded improperly, the ground loop noise current exists and thus it must be eliminated by utilizing shield transformers, optical couplers, common-mode chocks, and balanced circuits.

In order to measure the conducted noise of a circuit, a line impedance stabilization network (LISN) is applied to suppress the noise interference of utility power. The common-mode and differential-mode currents of the circuit can be then derived by using a noise separator. In this thesis, the operating principle of LISN and noise separator are presented. Additionally, line filters are adopted to eliminate the conducted noises. Therefore, the circuit analysis and design procedure of a line filter are also presented herein.

The main contributions of this work are the theoretical analysis and experimental verification for the noise interferences. For different noise sources and coupling channels, the noise suppression methods proposed in this thesis are beneficial for engineers who suffer from noise problems in the experiments.

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