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supplying the power requirements to a sensor network using radio frequency power transfer提供的功率要求传感器网络使用射频功率传输.pdf

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supplying the power requirements to a sensor network using radio frequency power transfer提供的功率要求传感器网络使用射频功率传输

Sensors 2012, 12, 8571-8585; doi:10.3390/s120708571 OPEN ACCESS sensors ISSN 1424-8220 /journal/sensors Article Supplying the Power Requirements to a Sensor Network Using Radio Frequency Power Transfer Steven Percy 1, Chris Knight 1,*, Francis Cooray 2 and Ken Smart 2 1 Commonwealth Industrial Research Organisation (CSIRO), P.O. Box 330, Newcastle, NSW 2300, Australia; E-Mail: steven.percy@csiro.au 2 Commonwealth Scientific and Industrial Research Organisation (CSIRO), P.O. Box 76, Epping, NSW 1710, Australia; E-Mails: crfsc@.au (F.C.); ken.smart@csiro.au (K.S.) * Author to whom correspondence should be addressed; E-Mail: chris.knight@csiro.au; Tel.: +61-2-4960-6049. Received: 11 May 2012; in revisedform: 12 June 2012 / Accepted: 12 June 2012 / Published: 26 June 2012 Abstract: Wireless power transmission is a method of supplying power to small electronic devices when there is no wired connection. One way to increase the range of these systems is to use a directional transmitting antenna, the problem with this approach is that power can only be transmitted through a narrow beam and directly forward, requiring the transmitter to always be aligned with the sensor node position. The work outlined in this article describes the design and testing of an autonomous radio frequency power transfer system that is capable of rotating the base transmitter to track the position of sensor nodes and transferring power to that sensor node. The system’s base station monitors the node’s energy levels and forms a charge queue to