Arrays for Wireless Power Transfer and Harvesting

This talk will review design and implementation of rectenna arrays for wireless power transfer and harvesting. For low power levels, each antenna element contains a rectifier and the rectified dc power is summed. At ultra-low incident power densities in the case of harvesting, a sub-array might be necessary to turn on a rectifying element and strategies for arraying will be discussed. For beaming applications, power handling limitations demand either more distribution or higher-power rectifier topologies. Finally, efficient transmitters are an integral part of a far-field WPT system and will be briefly summarized.