Wireless charging in a room is like a pool: energy-water splashed everywhere, but tiny sensor-bobbers barely ripple. Their coils are too small to scoop from the scattered field. The energy doesn't escape at the speed of light like radio waves; it waits to be collected.

Engineers added funnel coils: they catch the scattered field and focus it into a stream onto the receiver. Efficiency soared 100-fold. The system delivers 0.5 W to a button-sized receiver (15 mm) — enough for micro-electronics.

Multiple repeaters can take turns beaming energy even through obstacles — into a desk drawer or under upholstery. This is a precise realization of the laws of Faraday and Maxwell, powering gadgets without batteries.