Updated on 7 September 2012
The discovery meant that the team could shrink the receiving antenna to a scale that makes wireless implantable devices feasible. At the optimal frequency, a millimeter-radius coil is capable of harvesting more than 50 microwatts of power, well in excess of the needs of a recently demonstrated eight microwatt pacemaker.
The team also designed an innovative slotted transmitting antenna structure that allows delivery of consistent power efficiency. Ms Poon has applied for a patent of the design. The design also focuses the radio waves at the point where the implanted device rests, increasing the electric field where it is needed most, but canceling it elsewhere. This helps to reduce overall tissue heating to levels well within the standards approved by the Institute of Electrical and Electronics Engineers.