一种基于子阵分解的高效整流天线阵列

A high-efficiency microwave rectenna array based on subarray decomposition

针对微波无线能量传输系统中接收端功率密度非均匀分布，提出了一种高效的子阵分解微波整流天线。通过研究接收天线阵列功率密度分布规律，设计了针对不同最佳功率点的整流电路。在微波整流电路功率动态范围有限的情况下，采用子阵分解微波整流天线设计，可以拓展微波整流功率范围，提高系统效率。实验结果表明，针对微波输出功率从-5~22dBm的类高斯分布接收阵列天线，采用最佳工作点为21、17和10dBm的3种微波整流电路，通过基于子阵分解进行优化排布，使整流天线的整体效率提高10%以上。

The receiving power density is non-uniformly distributed in a microwave wireless power transmission (MPT) system. A high-efficiency microwave rectenna based on subarray decomposition is proposed in this paper. Through study of the power density distribution on receiving antenna array, the corresponding rectifiers at three power levels were designed and fabricated. The rectifying efficiency was reduced in a microwave power transmission system as a result of limited power range of a microwave rectifier. Microwave rectennas based on subarray decompo?sition extend the range and improve the system efficiency. Experiments show that as for the Gauss like distributed receiving array antenna whose microwave output power ranges from -5dBm to 22dBm, three kinds of rectifiers, whose optimal points of power are 21dBm, 17dbm and 10dBm, respectively, have improved the total efficiency more than 10% by a subarray decomposition rectenna.