A thorough treatment of energy harvesting technologies, highlighting RF and hybrid-multiple technology harvesting. Explains the principles of solar, thermal, kinetic and electromagnetic energy harvesting, addresses design challenges, and describes applications. Features an introduction to switched mode power converters and energy storage, and summarizes the challenges of different system implementations, from wireless transceivers to backscatter communication systems and ambient backscattering. This practical resource is essential for researchers and graduate students in the field of communications and sensor technology, in addition to practitioners working in these fields.