Naoki Shinohara is Professor at the Research Institute for Sustainable Humanosphere (RISH) at Kyoto University in Japan. His research interests include wireless power transfer, microwave power transfer, and solar power satellites.

• Introduction ixChapter 1. History, Present and Future of WPT 11.1. Theoretical predictions and the first trial in the 19th Century 11.2. Rejuvenated WPT by microwaves in the 1960s 31.3. Inductive coupling WPT projects in the 20th Century 101.4. WPT as a game-changing technology in the 21st Century 12Chapter 2. Theory of WPT 212.1. Theoretical background 212.2. Beam efficiency and coupling efficiency 222.2.1. Beam efficiency of radiowaves 222.2.2. Theoretical increase of beam efficiency 262.2.3. Coupling efficiency at very close coupling distance 312.3. Beam forming 332.3.1. Beam-forming theory for the phased array and its error 332.3.2. Target detecting via radiowaves 422.4. Beam receiving 47Chapter 3. Technologies of WPT 533.1. Introduction 533.2. Radio frequency (RF) generation – HPA using semiconductors 563.3. RF generation – microwave tubes 623.3.1. Magnetrons 633.3.2. Traveling wave tube/traveling wave tube amplifier 783.3.3. Klystron 803.4 Beam-forming and target-detecting technologies with phased array  813.4.1. Introduction 813.4.2. Phased array in the 1990s 823.4.3. Phased array in the 2000s 883.4.4. Phased array using magnetrons 983.4.5. Retrodirective system 1053.5. RF rectifier – rectenna and tube type 1103.5.1. General rectifying theory of rectenna 1103.5.2. Various rectennas I – rectifying circuits 1183.5.3. Various rectennas II – higher frequency and dual bands 1233.5.4. Various rectennas III – weak power and energy harvester 1293.5.5. Rectenna array 1333.5.6. Rectifier using vacuum tube 138Chapter 4. Applications of WPT 1434.1. Introduction 1434.2. Energy harvesting 1454.3. Sensor network 1524.4. Ubiquitous power source  1564.5. MPT in a pipe 1604.6. Microwave buildings 1644.7. 2D WPT 1694.8. Wireless charging for electric vehicles 1714.9. Point-to-point WPT 1774.10. WPT to moving/flying target 1784.11. Solar power satellite 1854.11.1. Basic concept 1854.11.2. SPS as clean energy source of CO2-free energy and for sustainable humanosphere 1874.11.3. MPT on SPS. 1904.11.4. Various SPS models 192Bibliography 213Index 237