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.

本文概述了使用磁耦合优化无线电力传输系统。优化的目的是使功率传输效率或功率传输最大化。重新讨论了所得的载荷计算和匹配策略。此外，从耦合电路的等效电路和散射参数开始对其进行了描述。除了无线电力传输外，RFID和NFC系统中的通信及其频率特性和带宽问题也得到了重点介绍。本文的重点是在标签和读取器之间进行数据传输的负载调制。为此，使用时域以及频域信号分析来得出子载波电压。