摘要
设计了一款针对WiFi信号的环境能量采集系统,工作频率范围从2.4 GHz到2.485 GHz.该系统采用了4倍压整流电路,并设计了从天线到整流电路的宽带匹配电路,提升了能量采集的效率.设计的宽带匹配电路在WiFi工作频率范围内,S_(11)均小于-10 dB.整流电路可将采集信号增加4倍,能有效提高RF-DC转换效率.测试结果表明,所设计的电路达到了设计要求,在-10 dBm的输入功率下,达到了40%的RF-DC转换效率,并使超级电容在30 min内采集到了257 mV的电压.
An ambient WiFi energy harvesting system is presented in this paper,with operating frequency from 2. 4 GHz to 2. 485 GHz.A voltage multiple rectifier is used in this design,and a broadband matching network for the cir-cuit from antenna to rectifier is proposed to improve the efficiency of energy harvesting. S11 of the proposed broad-band matching circuit is less than-10 dB within the WiFi working frequency range.The harvesting signal can be in-creased by 4 times through the rectifier circuit,thus effectively improve the RF-DC conversion efficiency.Experiment results show that,with an input power of-10 dBm,the design achieves 40%of RF-DC conversion efficiency and the super capacitor harvests voltage of 257 mV in 30 minutes.
出处
《南京信息工程大学学报（自然科学版）》
CAS
2017年第1期92-96,共5页
Journal of Nanjing University of Information Science & Technology（Natural Science Edition）
基金
浙江省教育厅科研计划(Y201121456)
关键词
环境能量采集
整流电路
阻抗匹配
射频直流转换效率
ambient WiFi energy harvesting
rectifier
impedance matching network
RF-DC conversion efficiency
