Reply to post: Re: People don't like batteries

What a good eye-dea: Battery-less, grain-of-sand-sized 2.4GHz transmitter to help save your eyesight

Anonymous Coward
Trollface

Re: People don't like batteries

Good in the medical world, good for science too - think how easy it will be to track bees and butterflies etc now, essentially they will all be carrying Bluetooth phones (LOL).

Not sure it quite works like that. The journal paper describes the prototype device's 2.4 mm diameter transmitting antenna and the external receiving antenna as being separated by 20 cm of air and 5 mm of rat skin, so we are not talking long range. The way that the device was powered was also quite interesting:

We developed a resonant cavity based wireless power transfer (WPT) method to deliver power to the device in a freely moving small rodent, where the cavity resonator acts like a cage for the rodent.

Fortunately the authors proposed that "For human use, we can adopt a conceptually similar but cavity-less, magnetic resonance coupled WPT method", so the patient wouldn't have to put their head or face in a small metal box.

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