2019•Unpublished venueRequires access

Wireless Power Transmission

Naoki Shinohara

Abstract

This chapter describes various wireless power transmission (WPT) technologies, including inductive coupling, radio waves, and resonance coupling. WPT is, in fact, a valuable and convenient technology that can be used to charge the batteries in mobile phones, notebook PCs, electric vehicles (EVs), light-emitting diodes (LEDs), integrated circuits (ICs), and other equipment. Inductive coupling WPT is based on Ampere's circuital law and Faraday's law of induction. Inductive coupling WPT is the oldest type of WPT used in real applications. Radio frequency identification (RFID) is currently the only commercial application of WPT via microwaves. The concept of a ubiquitous power source (UPS) was proposed in the 1990s, and is based on the concept that microwaves are everywhere and are always on with WPT. The beam efficiency between a transmitting antenna and a receiving antenna is calculated by the Friis transmission equation, and its expansion is used for calculating beam efficiency in the near field.

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Available abstract

Key concepts: Faraday cage, Electrical engineering, Wireless, Microwave, Rectenna, Coupling (piping), Inductive coupling, Antenna (radio)