Original poster: m.j.watts@xxxxxxxxxxxx On 20 Dec 2005, at 18:24,
Tesla list wrote:
> Original poster: Aaron Banerjee <spam_proof@xxxxxxxxxxxxxxxx>
>
>
> I recently attented an interesting presentation on the use of
> fractal antennas. I was wondering if anyone was building coils
> designed to resonate at multiple, disparate frequencies (e.g. not
> just w, 2w, etc) or at least using coils with multiple resonances.
> I seem to have enough trouble getting my coil to resonate at one
> frequency, but I thought someone out there may have thought of the
> idea..
>
> Supposing for the moment that you were trying to do the wireless
> power thingy, could a broadband antenna help improve efficiency?
> If so, is there a good way to broadcast power (e.g. more than just
> enough for a voice/data signal, etc) through one? - Aaron Banerjee
The receiver would have to be capable of receiving all those
frequencies equally well. Moreover, the fact that it is broadband
implies a lack of selectivity and in the case of a high powered
impulse-driven transmitter, high-powered broadband splatter. Kind of
like an out-of- tune TC. Not a popular device with the neighbours. I
imagine too that group delay would become a serious issue when it
came to efficiency.
Malcolm