News for hackers. Stuff that matters.

A comment on Wireless devices go battery-free with new communication technique. Parent comment

Re:Wireless devices go battery-free with new communication t... by csmatt on Tuesday August 13, 2013 @04:54PM (#6208199)
Does the increase in radio receivers require an increase in the energy to broadcast to the same area?
[ Parent | on HN ]
Re:Wireless devices go battery-free with new communication t... by acjohnson55 on Tuesday August 13, 2013 @05:09PM (#6208276)
Nope. If it were inductive or capacitive transmission, this would be the case, but for far-field radiation, it's generally not.
[ Parent | on HN ]
Re:Wireless devices go battery-free with new communication t... by josh2600 on Tuesday August 13, 2013 @05:09PM (#6208282)
It's more Shannon-Hartley: http://en.wikipedia.org/wiki/Shannon%E2%80%93Hartley_theorem (I think).
[ Parent | on HN ]