You're right... from that angle I can't see if the thing is open or not...

Looking on the bright side - he won't have any butt-crispies.

 

Looking on the bright side - he won't have any butt-crispies.

.

 

Ambient RF Energy Supports Wireless Sensors

http://mwrf.com/active-components/a...icle_5_b&YM_RID=CPG05000002060050&YM_MID=1060

 

Ambient RF Energy Supports Wireless Sensors

http://mwrf.com/active-components/a...icle_5_b&YM_RID=CPG05000002060050&YM_MID=1060

Manufacturers are falling over each other to develop micropower devices - running off ambient RF is slowly becoming a reality.

 

Manufacturers are falling over each other to develop micropower devices - running off ambient RF is slowly becoming a reality.

That's great if you live in a EM dense urban environment. Most depend on cell towers for energy with a usable limit of several hundred meters and high power large city TV UHF 1 MW ERP stations for a range of about 10km from the towers at the low uW level for the device. These low levels are ok for slow sensors (>60second duty cycle) that only collect data in spurts and can sleep for long periods between but they are almost useless for fast real-time data collection as once you wakeup the power requirements will be much higher than can be obtained by ambient RF.

 

That's great if you live in a EM dense urban environment. Most depend on cell towers for energy with a usable limit of several hundred meters and high power large city TV UHF 1 MW ERP stations for a range of about 10km from the towers at the low uW level for the device. These low levels are ok for slow sensors (>60second duty cycle) that only collect data in spurts and can sleep for long periods between but they are almost useless for fast real-time data collection as once you wakeup the power requirements will be much higher than can be obtained by ambient RF.

Unless you use high voltage batteries to boost the harvested RF energy, like the OP recommends.