Wireless Power Transfer Applied to NFC

This chapter analyzes Wireless Power Transfer (WPT) within the NFC scenario using a smartphone as the reader. It describes the reader and the tag and proposes both a system model and a procedure to understand, analyze and design WPT in NFC systems, when using a smartphone as the reader to connect to standardized NFC tags. Even though a device with NFC technology can transmit power wirelessly to power up a receiver, its main purpose is the data transfer. The coupling coefficient of a pair of coils is a measure of the magnetic field transferred between them and therefore it is a fundamental parameter in NFC. It depends on the shape of the antennas, the distance and alignment between them, and the materials. The chapter presents viable options for developing applications in real‐life scenarios, hence the importance of analyzing and comparing the current, commercially available NFC IC.