A New Wireless Power Transmission (WPT) System for Powering Wireless Sensor Networks (WSNs) in Cavity-Based Equipment

被引:0
作者
Abdelraheem, Ahmed [1 ]
Sinanis, Michael D. [1 ]
Peroulis, Dimitrios [1 ]
机构
[1] Purdue Univ, Birck Nanotechnol Ctr, Sch ECE, W Lafayette, IN 47907 USA
来源
2019 IEEE 20TH WIRELESS AND MICROWAVE TECHNOLOGY CONFERENCE (WAMICON) | 2019年
关键词
Wireless Power Transmission; Electromagnetic Time Reversal; Statistical Electromagnetics; REVERBERATION; FIELDS;
D O I
10.1109/wamicon.2019.8765430
中图分类号
TP3 [计算技术、计算机技术];
学科分类号
0812 ;
摘要
We introduce a new cavity-based wireless power transmission (WPT) system that could be applied to any cavity-based equipment regardless of its shape and size. The proposed scheme provides uniform and selective powering modes. In either powering mode, the field is isotropic, which removes the WPT-restrictions on placement and orientation of the energy harvester. The design process has three main steps, randomness creation, frequency selection, and waveform generation. We validate the proposed scheme in a lab lyophiliser's (freeze-drier) chamber. First, we create a random electromagnetic environment using mechanical stirring. Then, we evaluate this randomness in terms of the average to minimum power ratio. To select an appropriate frequency for the WPT system, we consider randomness and power uniformity. To maintain randomness, we extract the lowest usable frequency of the chamber using a Goodness of Fit test; this is found to be 6 GHz. As for the power uniformity, we plot the standard deviation (STD) of a large sample of the received powers at different locations. This plot is used to select the frequency based on an arbitrary uniformity level in terms of STD. At 6 GHz a 2.5 dB standard deviation is calculated. To enable the selective powering mode, we propose the electromagnetic time reversal (EMTR) technique. We show that EMTR can, theoretically, focus 97% of the energy on 0.5 lambda-diameter area in an ideally random environment.
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页数:5
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