Design of impedance matching circuits for RF energy harvesting systems
Design of impedance matching circuits for RF energy harvesting systems
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DOI：
10.1016/j.mejo.2017.02.004
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发表时间：
2017-04-01
影响因子：
2.2
通讯作者：
Moez, Kambiz
中科院分区：
文献类型：
--
作者：
Hameed, Zohaib;Moez, Kambiz
本文提出了一种系统的设计方法，用于RF能量采集器的阻抗匹配电路，以最大限度地提高采集能量的输入功率电平范围内与已知的分布。射频整流器的输入匹配网络设计不同于传统的射频电路，如低噪声放大器，这是因为射频整流器中的晶体管工作在不同的区域。在这项工作中，它示出的整流器的输入阻抗估计基于小信号模拟的晶体管在整流器中的输入信号的峰值时，晶体管被偏置与稳定的DC工作电压提供了最大的收获能量从一个固定的输入功率。对于可变的输入功率水平，匹配网络选择策略，提出了最大化的期望收获的能量给定的概率密度分布的输入功率水平。作为一个实验样本，RF能量采集器电路的设计，以最大限度地提高收获的能量在902-928 MHz频带采用片外阻抗匹配电路设计使用所提出的方法。建议的RF能量采集器表现出测量的最大功率转换效率（PCE）为32%，在-15 dBm（32 μ W），并提供3.2 V的输出直流电压到1 M Ω负载。
This paper presents a systematic design methodology for impedance matching circuits of an RF energy harvester to maximize the harvested energy for a range of input power levels with known distribution. Design of input matching networks for RF rectifier differs from those for traditional RF circuits such as low-noise amplifier because the transistors in the RF rectifiers operate in different regions. In this work, it is shown that the input impedance of the rectifier estimated based on small signal simulation of transistors at the peak of input signal in the rectifier when the transistors are biased with stable DC operating voltage provides the largest harvested energy from a fixed input power. For variable input power levels, a matching network selection strategy is proposed to maximize expected harvested energy given the probability density distribution of input power levels. As an experimental sample, an RF energy harvester circuit is designed to maximize the harvested energy in the 902-928 MHz band employing an off-chip impedance matching circuit designed using the proposed methodology. The proposed RF energy harvester exhibits a measured maximum power conversion efficiency (PCE) of 32% at - 15 dBm (32 mu W) and delivers an output DC voltage of 3.2 V to a 1 M Omega load.