Inductive coupling for wireless power transfer and near-field communication
Christoph Degen
Abstract
Abstract This paper gives an overview of optimizing wireless power transfer systems using magnetic coupling. Optimization aims to maximize either the power transfer efficiency or the transferred power. The resulting load calculation and matching strategies are revisited. Moreover, the coupling system is described, starting with its equivalent circuit and scattering parameters. In addition to wireless power transfer, communication in RFID and NFC systems and its frequency characteristics and bandwidth issues are highlighted. The focus in this paper is on load modulation for data transfer between a tag and reader. For this purpose, subcarrier voltages are derived using time-domain as well as frequency-domain signal analysis.
Topics & Concepts
Computer scienceSubcarrierWireless power transferWirelessPower-line communicationCoupling (piping)Bandwidth (computing)Maximum power transfer theoremFrequency domainElectronic engineeringPower (physics)Electrical engineeringChannel (broadcasting)TelecommunicationsOrthogonal frequency-division multiplexingPhysicsMaterials scienceEngineeringMetallurgyQuantum mechanicsComputer visionWireless Power Transfer SystemsEnergy Harvesting in Wireless NetworksRFID technology advancements