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Paper Abstract and Keywords
Presentation 2012-11-09 14:15
The Improvement of Receiving Equipment for an Intermittent Microwave Power Transmission to a ZigBee device
Takuya Ichihara, Tomohiko Mitani, Naoki Shinohara (Kyoto Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) Battery problems of a wireless sensor device including its lifetime and exchange cost are serious obstacles to constructing a wireless sensor network. In the previous study we realized to drive a ZigBee device, which is compatible with a wireless sensor network, by intermittent microwave power transmission with the ZigBee device kept participating in the communication network. However, the conversion efficiency from receiving power to ZigBee consumption was only 27.5%. The low efficiency was caused by a gap between the actual load of the RF-DC rectifier and its optimal load because the input voltage of a stable output circuit affected its input impedance. The objective of the present study is improvement of receiving equipment in order to realize high RF-DC efficiency in the wide range of output load. We investigated two ways for the improvement by simulation. First, we simulated a RF-DC rectifier with reflection. We found out that totally efficiency dropped because of the insertion loss of a circulator though the range of the efficiency of 50% or more became wide by using the RF-DC rectifier with reflection. Next, we simulated a RF-DC-DC circuit with a DC-DC PWM boost converter. The conversion efficiency was over 70% in the wide range of load from 3.9 times to 13.7 times of the optimal load of the RF-DC rectifier.
Keyword (in Japanese) (See Japanese page) 
(in English) Microwave Power Transmission / ZigBee / Wireless Sensor Network / RF-DC-DC Circuit / / / /  
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Conference Information
Committee EE WPT  
Conference Date 2012-11-08 - 2012-11-09 
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Paper Information
Registration To WPT 
Conference Code 2012-11-EE-WPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) The Improvement of Receiving Equipment for an Intermittent Microwave Power Transmission to a ZigBee device 
Sub Title (in English)  
Keyword(1) Microwave Power Transmission  
Keyword(2) ZigBee  
Keyword(3) Wireless Sensor Network  
Keyword(4) RF-DC-DC Circuit  
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1st Author's Name Takuya Ichihara  
1st Author's Affiliation Kyoto University (Kyoto Univ.)
2nd Author's Name Tomohiko Mitani  
2nd Author's Affiliation Kyoto University (Kyoto Univ.)
3rd Author's Name Naoki Shinohara  
3rd Author's Affiliation Kyoto University (Kyoto Univ.)
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Speaker Author-1 
Date Time 2012-11-09 14:15:00 
Presentation Time 25 minutes 
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Volume (vol) vol.112 
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