基于磁耦合感应的无源应答器设计

摘要

For the problem of short communication distance in the low-frequency magnetic communication system,a passive transponder is designed based on magnetic coupling induction.The design consists of antennas,power storage,signal pro-cessing and signal amplifier.The system adopts the idea of low-power circuits and high-power emission design,magnetic en-ergy is converted into AC electric by the receiving antenna.Rectifier and filter circuit converts AC power into DC power. The system is supplied by DC power after a step-down by voltage circuit.Modulation signal is amplified by the signal pro-cessing module.The amplified signal is sent to the reader through the transmitting antenna.Because of the high amplifier power,the reader can easily receive the remote signal.%针对低频磁通信系统通信距离短的问题，设计了一种基于磁耦合感应的无源应答器。该无源应答器由收发天线、电源模块、信号处理、信号放大4部分构成。采用低功耗电路和大功率发射的设计理念，当接收天线将感应到的磁能转换成交流电能，整流滤波电路把交流电转换成直流电，经过稳压电路降压后对系统供电，功率放大器将调制信号放大，放大信号经过发射天线发送至阅读器，阅读器能有效地接收远程信号。