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

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p_g
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re: RF-based energy harvesting is "back to the future" again, but with a twist
p_g   7/23/2010 5:58:22 AM
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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
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re: RF-based energy harvesting is "back to the future" again, but with a twist
Dan Mitten   7/18/2010 8:04:01 PM
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What next, an "RF Harvester" in a cell phone? Sounds like a perpetual motion machine!

mho_daraf
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re: RF-based energy harvesting is "back to the future" again, but with a twist
mho_daraf   6/29/2010 5:44:51 PM
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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.

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