Optimization of Passive Low Power Wireless Electromagnetic Energy Harvesters

被引：37
|
作者：
Nimo, Antwi [1 ]
Grgic, Dario [1 ]
Reindl, Leonhard M. [1 ]
机构：
[1] Univ Freiburg, Dept Microsyst Engn, Lab Elect Instrumentat, IMTEK, D-79110 Freiburg, Germany
来源：
SENSORS | 2012年 / 12卷 / 10期
关键词：
RF energy harvesting; wireless power transmission; coupled resonators; Schottky diode; RF to DC power converter; impedance matching; PI-matching; L-matching; rectenna; LOW-FREQUENCY NOISE; RECTENNA; SENSOR; TRANSMISSION; TRANSPONDER; CIRCUIT; DESIGN;
D O I：
10.3390/s121013636
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
This work presents the optimization of antenna captured low power radio frequency (RF) to direct current (DC) power converters using Schottky diodes for powering remote wireless sensors. Linearized models using scattering parameters show that an antenna and a matched diode rectifier can be described as a form of coupled resonator with different individual resonator properties. The analytical models show that the maximum voltage gain of the coupled resonators is mainly related to the antenna, diode and load (remote sensor) resistances at matched conditions or resonance. The analytical models were verified with experimental results. Different passive wireless RF power harvesters offering high selectivity, broadband response and high voltage sensitivity are presented. Measured results show that with an optimal resistance of antenna and diode, it is possible to achieve high RF to DC voltage sensitivity of 0.5 V and efficiency of 20% at -30 dBm antenna input power. Additionally, a wireless harvester (rectenna) is built and tested for receiving range performance.
引用
收藏
页码：13636 / 13663
页数：28
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