一种应用于2.45GHz的微带整流天线设计

Design of micro-strip rectenna for 2.45GHz

为实现对低功耗负载的微波供电,设计了应用于2.45 GHz的微带整流天线。在接收天线设计中,引入了光子晶体(PBG)结构,提高了接收天线的增益和方向性;在低通滤波器部分引入了缺陷地式(DGS)结构,以相对简单的结构实现了2.8 GHz低通滤波器特性;最后通过ADS软件设计得出了用于微带传输线与整流二极管间的匹配电路。将接收天线、低通滤波器和整流电路三部分微带电路进行整合,完成整流天线的设计。通过实验测试,该整流天线的增益为4.29 dBi,最高整流效率为63%。通过引入光子晶体结构和缺陷地式结构,在保证整流天线增益和整流效率的基础上,有效地减小了天线的尺寸,简化了设计方法。

This paper describes a compact 2.45GHz rectenna for low power load. The received antenna is designed with low- cost smaller pbotonic band gap （PBG） structure improving the gain of the rectenna. The defected ground structure （DGS） is introduced to design the low pass filter for a simple design. The match circuit between the 50Ωline and the RF-DC rectifying circuits is designed by ADS. The antenna, low-pass filter and rectifier circuits are first designed and measured separately. Finally, they are combined to form the complete rectenna. The gain of the rectenna is 4.29 dBi and the efficiency of the rectenna is 63%. This design with PBG and DGS structure reduced the size of the rectenna and simplified the whole structure based on an ensured gain and rectifying efficiency.