Low-Power Wireless Power Delivery
Low-Power Wireless Power Delivery
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DOI：
10.1109/tmtt.2012.2193594
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发表时间：
2012-07-01
影响因子：
4.3
通讯作者：
Popovic, Zoya
中科院分区：
文献类型：
--
作者：
Falkenstein, Erez;Roberg, Michael;Popovic, Zoya
本文讨论了集成整流天线（整流天线）的设计和实现，在低入射功率密度，从25到200 μ W/cm（2）的无线供电。源拉整流装置的非线性测量相比，谐波平衡模拟。最有效的整流，作为输入功率的函数，最佳二极管的射频和直流阻抗。这允许优化的天线设计，这可以消除或简化匹配网络并提高整体效率。作为设计方法的一个例子，肖特基二极管的特点是在1.96 GHz和天线匹配最有效的整流器的最佳复阻抗。对于感兴趣的入射功率密度范围，最佳阻抗为137 + j149 Ω，其中仅整流电路的RF到DC转换效率为63%，并且总整流天线效率为54%。
This paper addresses design and implementation of integrated rectifier-antennas (rectennas) for wireless powering at low incident power densities, from 25 to 200 mu W/cm(2). Source-pull nonlinear measurement of the rectifying devices is compared to harmonic-balance simulations. Optimal diode RF and dc impedances for most efficient rectification, as a function of input power, are obtained. This allows optimized antenna design, which can eliminate or simplify matching networks and improve overall efficiency. As an example of the design methodology, Schottky diodes were characterized at 1.96 GHz and an antenna is matched to the optimal complex impedance for the most efficient rectifier. For incident power density range of interest, the optimal impedance is 137 + j149 Omega, with an RF to dc conversion efficiency of the rectifying circuit alone of 63% and total rectenna efficiency of 54%.