Analysis of Voltage Doubler Behavior of 2.45-GHz Voltage Doubler-Type Rectenna
Analysis of Voltage Doubler Behavior of 2.45-GHz Voltage Doubler-Type Rectenna
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DOI：
10.1109/tmtt.2017.2668413
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发表时间：
2017-04-01
影响因子：
4.3
通讯作者：
Nishimura, Taiga
中科院分区：
文献类型：
--
作者：
Mitani, Tomohiko;Kawashima, Shogo;Nishimura, Taiga
本文描述了2.45 GHz VD型整流天线的倍压特性。开发的VD型整流天线的一个重要特征是没有传统VDS中存在的电荷泵电容。根据电路仿真和测量结果，与半波整流(HWR)型整流天线相比，所研制的VD型整流天线在输出负载超过100Omega时，射频-直流(RF-DC)转换效率有了显著提高。模拟结果表明，即使在没有电荷泵电容的情况下，VD型和HWR型整流管也表现出了VD行为。这种行为被发现归因于存储在整流管中肖特基势垒二极管的结电容和封装电容中的电荷。此外，还发现射频-直流转换效率的提高是由于串联二极管的电压守恒所致。这种改善依赖于微波周期和放电时间常数。当微波周期与放电时间常数相当时，即使在输入微波电压为负的情况下，VD型整流天线仍保持直流电压。通过对电路仿真得到的整流管等效电路的电压和电流波形进行分析，观察到了这些现象。
This paper describes the voltage doubler (VD) behavior of a 2.45-GHz VD-type rectenna. An important feature of the developed VD-type rectenna is the absence of the charge pump capacitor that is present in conventional VDs. Based on the circuit simulation and measurement results, the developed VD-type rectenna shows drastic improvement to the radio frequency-to-direct current (RF-dc) conversion efficiency in comparison with a half-wave rectifier (HWR)-type rectenna at output loads exceeding 100 Omega. From the simulation, both the VD- and HWR-type rectennas show VD behavior, even without the charge pump capacitor. This behavior was found to be attributable to the electric charge stored in the junction and package capacitances of the Schottky barrier diode in the rectennas. Additionally, it was found that the improvement of the RF-dc conversion efficiency is caused by the voltage conservation in the series diode. This improvement is dependent on the microwave period and the electric discharge time constant. When the microwave period is comparable with the electric discharge time constant, the VD- type rectenna conserves a dc voltage even when the input microwave voltage is negative. These phenomena were observed by analyzing the voltage and current waveforms of the rectenna equivalent circuit obtained via circuit simulation.