用于环境电磁能量收集的宽输入功率整流电路设计

Rectifier with wide input power range for ambient electromagnetic energy harvesting

采用场效应管FET与单个二极管相连,设计了一个在较宽输入功率范围内具有高整流效率的整流电路。场效应管FET的工作特性使与之相连的二极管可整流的功率范围变宽,因此拓宽了整流电路的输入功率范围。匹配网络由两个L型微带枝节构成,将电路的中心频率匹配至1GHz。实测结果显示,该电路在输入功率为-20dBm时的整流效率为27%,在-13.5-1dBm变化范围内,整流效率高于50%,且在-5dBm时具有最高整流效率60.1%。该整流电路在低功率环境下具有较好的整流特性,且输入功率范围较宽,适用于能量收集系统。

This paper designed a rectifier with the high rectifying efficiency within a wide input power range by connecting the single diode to a field effect transistor（FET）.The characteristics of FET make the connected diode rectify within a wide power range,which extends the input power range of the proposed rectifier.The rectifier is matched well at the center frequency of 1 GHz by using the impedance matching network composed of two L-shaped stubs.The measured rectifying efficiency of 27%is achieved at the input power of-20 dBm.The rectifying efficiency is above 50%in the input power range from-13.5 dBm to 1 dBm,and the peak one is 60.1% at the input power of-5 dBm.The characteristics of low power and wide input power range of the proposed rectifier is suitable for energy harvesting.