Preface; Acknowledgments; Contents; Contributors; Part I Technologies; 1 Non-radiative Wireless Power Transmission: Theory and Applications; 1.1 Introduction; 1.2 Two-Port Network Representation of a WPT Link; 1.2.1 Statement of the Problem; 1.2.2 Impedance Matrix Modeling of a WPT Link; 1.2.3 Admittance Matrix Modeling of a WPT Link; 1.3 Application of Theory: The Case of Two Coupled Inductances; 1.3.1 Coupled Inductances with a Capacitive T Network on the Primary Side; 1.4 Application of Theory: The Case of a Capacitive WPT Link; References; 2 Wireless Power Transfer Based on Metamaterials

2.1 Introduction2.2 Metamaterials for WPT; 2.2.1 Metamaterials and Superlens; 2.2.2 Metamaterials and WPT; 2.2.3 Experimental Realization; 2.3 Array of Resonators for Mobile Power Transfer; 2.3.1 Array of Coupled Resonators; 2.3.2 Numerical Simulations and Circuit Analysis; 2.3.3 Experiment Demonstration; 2.4 Conclusion; References; 3 Optimal Array Beamforming for Microwave Power Transmission in Complex Environment; 3.1 Microwave Power Transmission System; 3.1.1 Problem Formulation; 3.1.2 Transmission Efficiency Based on Antenna Parameters

3.1.3 Transmission Efficiency Based on Channel Transfer Function3.1.4 Experiment Study of Indoor MPT; 3.2 Review of Optimal Beamforming Techniques; 3.2.1 Array Factor Optimization; 3.2.2 Retrodirective Array/Phase Conjugate Array; 3.2.3 Adaptive Array Digital Beamforming; 3.3 Time Reversal Eigenmode Beamforming; 3.3.1 Pseudo Transmission Efficiency; 3.3.2 Transmission Efficiency Optimization; 3.3.3 Time Reversal Eigenmode Beamforming; 3.4 Numerical Examples; 3.4.1 Arbitrary Array Beamforming in Free Space; 3.4.2 Arbitrary Array Beam Steering

3.4.3 Arbitrary Array Beamforming in Multipath Environment3.5 Conclusion; References; 4 Far-Field Wireless Power Transfer for IoT Sensors; 4.1 Introduction; 4.1.1 Near-Contact WPT; 4.1.2 Far-Field WPT; 4.2 Far-Field WPT Basics; 4.2.1 Power Density; 4.2.2 Wireless Power Transfer; 4.2.3 RF Harvesting from the Ambient; 4.3 Rectifier; 4.3.1 Equivalent Circuit Analysis; 4.3.2 Harmonic Current Analysis; 4.4 Cascaded Rectifiers; 4.5 Receive Antenna; 4.5.1 Antenna Input Impedance; 4.5.2 Antenna Integration Level; 4.5.3 Antenna Shielding; 4.5.4 Miniaturized Complex Conjugately Matched Antenna

4.5.5 Miniature Shielded Antenna4.6 Rectenna; 4.6.1 Power Management; 4.6.2 Efficiency Evaluation; 4.6.3 Complete Rectenna; 4.7 Future Developments; 4.8 Conclusions; References; 5 Wireless Power Transfer: Discrete Rectifier Modeling and Analysis; 5.1 Introduction; 5.2 Rectifier Modeling; 5.2.1 I-V Relationship; 5.2.2 Macro Model; 5.2.3 Integrated Equivalent; 5.2.4 SPICE Model; 5.3 Circuit Analysis Techniques; 5.3.1 Software Tools; 5.3.2 Time Trajectory Technique; 5.3.3 Adaptive Input Power Algorithm; 5.3.4 Steady-State Algorithm; 5.4 Comparing Topologies; 5.4.1 Definition of Efficiency