CHAPTER 1 INTRODUCTION 1 1.1 MOTIVATION 1 1.2 THESIS ORGANIZATION 4 1.3 PAPER SURVEY 6 CHAPTER 2 EMC REGULATIONS AND TEST EQUIPMENTS 8 2.1 EMC REGULATIONS 8 2.1.1 The requirements of the European Commission (EC) Directives 8 2.1.2 EMC Regulation 9 2.1.3 CE Regulation 11 2.1.4 FCC Regulation 12 2.1.5 VCCI Regulation 13 2.2 TEST EQUIPMENTS 15 2.2.1 Conducted Test Setup Diagram 15 2.2.2 Conducted Test Equipments 18 2.2.3 Conducted Emission Measurement 25 2.2.4 Open Field Test Site Setup Diagram 27 2.2.5 Radiated Test Equipments 29 2.2.6 DUT Configuration on Measurement 32 CHAPTER 3 THEORETICAL ANALYSIS 34 3.1 GROUNDING TECHNIQUE 34 3.1.1 Magnetic Coupling between Shield and Inner Conductor 34 3.1.2 Ground Loop 35 3.1.3 Shielding to Prevent Magnetic Radiation 38 3.1.4 Common Mode Chock 42 3.2 SHIELDING TECHNIQUE 48 3.2.1 Near Fields and Far Fields 48 3.2.2 Radiation field of the elemental electric dipole in the near field 53 3.2.3 Radiation field of the elemental electric dipole in the far field 54 3.2.5 Plane Waves 55 3.2.6 Shielding Impedance 57 3.2.7 Skin Depth 59 3.2.8 Shielding Effectiveness 61 3.2.9 Absorption Loss 62 3.2.10 Reflection Loss 65 3.2.11 Reflection loss for either the E or H field 66 3.2.12 Reflection Loss to Plane Waves 68 3.2.13 Reflection Loss in the Electric Field 70 3.2.14 Reflection Loss in the Magnetic Field 72 3.2.15 Thin Shield Correction Factor 74 3.2.16 Shielding Effectiveness Summary 77 3.3 FILTERING TECHNIQUES 79 3.3.1 Differential-Mode Radiation 79 3.3.2 Fourier Series 82 3.3.3 Filtering Components 86 3.3.4 Ring Damped by Output Resistor 93 3.3.5 Ferrite Beads 95 3.3.6 A summary of noise reduction by filtering techniques 98 CHAPTER 4 EXPERIMENTAL RESULTS 100 4.1 DUT SETUP DIAGRAM 100 4.2 DUT CONFIGURATION ON MEASUREMENT 101 4.3 RADIATED EMISSION DATA 101 4.4 OPERATING CONDITIONS OF THE DUT 101 4.5 EXPERIMENTAL DATA OF GROUNDING TECHNIQUE 103 4.6 EXPERIMENTAL DATA OF SHIELDING TECHNIQUE 107 4.7 EXPERIMENTAL DATA OF FILTERING TECHNIQUE 110 CHAPTER 5 CONCLUSION 115 REFERENCES 117