Transcript RF Energy Harvesting

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
RF Energy Harvesting
Ambient Energy sources
RF Energy Harvesting
Ambient RF Energy sources
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
RF Energy Harvesting
The Concept
Tx
Rx
Base
station
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RF Energy Harvesting
The Harvesting Unit
Single
source
Static
receiver
Multiple
sources
Portable
receiver
Static
receiver
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
Portable
receiver
RF Energy Harvesting
The Harvesting Unit
impedance
matching
Rectifier
RF2DC
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Summation
&
Storage
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Application
RF Energy Harvesting
The Harvesting Antenna
wide band antenna
Antenna directivity
Narrow band antenna
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RF Energy Harvesting
The Harvester IM network
Frequency and power consideration
E(%)
Passive
Active
100
90
80
70
60
50
40
30
20
10
0
(-dBm)
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0 dBm

(+dBm)
RF Energy Harvesting
The Harvester RF2DC unit
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
RF Energy Harvesting
The Harvester storage & summation unit
Single VS. multiple sources
CRF2DC 1
CRF2DC 2
+
Cstorage
CRF2DC n
CRF2DC
Cstep up
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RF Energy Harvesting
Conclusions
advantage:
• Free energy
• Wireless energy transfer
• Portable devices
Disadvantage:
•
•
•
•
Low power density (environment)
Low efficiency (RF2RF)
High efficiency conversion - complicated system
Limitation of ISM band
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