Design Con 2015
Breaking News
Power DesignLine Blog

RF-based energy harvesting is "back to the future" again, but with a twist

NO RATINGS
View Comments: Newest First | Oldest First | Threaded View
p_g
User Rank
Rookie
re: RF-based energy harvesting is "back to the future" again, but with a twist
p_g   7/23/2010 5:58:22 AM
NO RATINGS
Its certainly an interesting idea to harvest energy from RF signals. I guess it will impact the strength and range of existing RF signal, since we will be disturbing fields.

Dan Mitten
User Rank
Rookie
re: RF-based energy harvesting is "back to the future" again, but with a twist
Dan Mitten   7/18/2010 8:04:01 PM
NO RATINGS
What next, an "RF Harvester" in a cell phone? Sounds like a perpetual motion machine!

constant314
User Rank
Rookie
re: RF-based energy harvesting is "back to the future" again, but with a twist
constant314   6/29/2010 5:44:51 PM
NO RATINGS
I was thinking about the Poynting vector and receive antennas recently. Initially, of course, there is no current in the antenna. The broadcast EM field has a Poynting vector that impinges on the antenna and deposits a little bit of power there. That gets some current going. The interesting thing, from the energy harvesting point of view, is that the current in the antenna warps the EM field so that the Poynting vector is bent toward the antenna. The antenna drains power from a volume of free space around the antenna. In effect, the capture cross section of the antenna is much wider than the antenna. Convenient, isn?t it? You don?t have to fill a space with metal to harvest most of the incident RF energy passing through that space.

Most Recent Comments
sempaiscuba
 
R0ckstar
 
sempaiscuba
 
sempaiscuba
 
Parreco
 
rick merritt
 
Max The Magnificent
 
GordonScott
 
sempaiscuba
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Top Comments of the Week