关键词: 无线能量传输, 微波整流, 半导体开关, 唤醒电路

Abstract:

To meet the needs of the lowpower wakeup module of active electronic tags and sensor nodes, this paper proposes a method of wireless control of semiconductor switches based on microwave rectification. In this design, with the DC power controlled by the on/off state of a semiconductor switch, extremely lowpower consumption of the wakeup module during dormancy is achieved due to the extremely low leak current of the switch. Different from traditional microwave rectifiers that are designed to provide maximum output DC power, the rectification circuit in this paper is aimed to achieve the bets output DC voltage. Simulation and measurement results show that  a twoelement array design achieves the minimum required controlling voltage (1 V) for turning on a typical CMOS switch with an RF power level as low as18dBm received by both antenna elements.

Key words: wireless power transmission, microwave rectification, semiconductor switch, wake up circuit