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The objective of the present study is to drive or charge a ZigBee device wirelessly by microwave power transmission. Wireless sensor network is expected to monitor several systems in order to control various infrastructures, such as electric power consumption, actively. However, power supply for sensor terminals is a critical problem to realize a fruitful wireless sensor network system. Primary batteries needs to be changed soon or later, wired power supply confines their installation location, and natural energy utilization like solar cells limits their regular operation. We therefore suggest wireless power supply for the sensor terminals by microwave power transmission. We adopt a ZigBee device as a wireless sensor terminal because of its low power consumption. We experimentally investigated electromagnetic compatibility between ZigBee and microwave power transmission, and found that there were some frequencies and power levels of microwave power transmission not to interrupt ZigBee. We also developed a microwave power receiving system which consists of a receiving antenna, a rectification circuit, a dc-dc converter, and a power storage circuit or a secondary battery. Finally we succeeded establishment of ZigBee network while driving a ZigBee device without batteries by microwave power transmission. Through the experiments, we found out intermittent microwave power transmission was preferable to CW microwave power transmission with respect to electromagnetic compatibility and rf-dc efficiency.

FEASIBILITY STUDY ON MICROWAVE POWER TRANSMISSION TO A ZIGBEE DEVICE FOR WIRELESS SENSOR NETWORK