Compact Size Wireless Power Transfer Using Defected Ground Structures (eBook)

Preface 7
Acknowledgements 10
Contents 11
About the Authors 13
Abbreviations 15
Nomenclature 17
List of Figures 18
List of Tables 22
1 Introduction 24
1.1 Overview of Wireless Power Transfer 24
1.2 Applications of WPT 26
1.3 Motivations of WPT 27
1.4 Challenges of WPT Systems Implementation 28
1.4.1 Non-radiative Systems 28
1.4.2 Radiative Systems 29
References 30
2 Basics of Wireless Power Transfer 32
2.1 Introduction 32
2.2 History of Wireless Power Transfer 32
2.3 Wireless Power Transfer Methods 35
2.3.1 Capacitive Coupling 36
2.3.2 Inductive Coupling 37
2.3.3 Resonant Inductive Coupling 38
2.3.4 Strong Resonant Inductive Coupling 38
2.3.5 Electromagnetic (EM) Radiation 39
2.4 Implementation of Near-Field WPT Systems 40
2.5 Implementation of Far-Field WPT Systems 42
2.6 Frequency Selection 46
2.7 Overview of Commercial Products Supporting WPT 47
References 49
3 Wireless Power Transfer Using DGSs 55
3.1 Introduction 55
3.2 An Overview on Defected Ground Structures (DGS) 57
3.3 WPT Systems Using DGSs 60
3.3.1 H-Shape DGS 60
3.3.2 Semi H-Shape 67
3.3.3 Spiral-Strips DGS 75
3.4 Design Method of the DGS-WPT Systems 80
3.5 Fabrication and Measurements 86
3.6 Power Transmission Through the Human Body 90
3.7 Power Handling Capability of the Proposed WPT Systems 92
References 92
4 Design Methods 95
4.1 Introduction 95
4.2 Design Method #1 95
4.3 Design Method #2 100
4.4 Verification of Design Method #2 102
4.4.1 Symmetric WPT System 102
4.4.2 Asymmetric WPT System 105
References 107
5 Future Directions 109
5.1 Summary 109
5.2 Future Directions 110
References 113