[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Fractal antennas and Tesla coils

Original poster: "Gary Peterson" <gary@xxxxxxxxxxxx>



Original poster: Aaron Banerjee <spam_proof@xxxxxxxxxxxxxxxx>



. . . 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 thought someone out there
may have thought of the idea.
Tesla himself designed Tesla coil transmitters to operate at multiple frequencies with which the transmitted energy can be manipulated in both the time and frequency domains. This work establishes the basic principles and techniques of frequency-hopping and frequency-division multiplexing spread spectrum telecommunications. (See http://www.tfcbooks.com/articles/control.htm for some additional observations on this subject.) 


Supposing for the moment that you were trying to do the wireless power
thingy, could a broadband antenna help improve efficiency? . . . is there
a good way to broadcast power (e.g. more than just enough for a voice/data
signal, etc) through one?


Tesla developed and refined two systems for the wireless transmission of
electrical energy.  One used atmospheric conduction and the other earth
resonance.  They both combine wireless telecommunications and electrical
power transmission.  Speaking about the atmospheric conduction method Tesla
said,
"The currents are proportionate to the potentials which are developed under otherwise equal conditions. If you have an antenna of a certain capacity charged to 100,000 volts, you will get a certain current; charged to 200,000 volts, twice the current. When I spoke of these enormous potentials, I was describing an industrial plant on a large scale because that was the most important application of these principles [the wireless transmission of electrical power], but I have also pointed out in my patents that the same principles can be applied to telegraphy and other purposes. That is simply a question of how much power you want to transmit." 
Nikola Tesla, 1916
While Tesla uses the term "antenna" above, keep in mind the launching structure is not a source of "radio waves" as are fractal antennas. (I use the term "radio waves" in its narrowest sense, i.e., far-field electromagnetic waves that have closed back upon themselves and are no longer associated with the launching structure and have their E and H components in phase.) These "radio waves" have nothing to do with the transmission of energy between the transmitting and receiving stations. In fact, they constitute a mechanism for the loss of electrical energy from the overall resonating system.
When an atmospheric-conduction system is configured for telecommunications only, the potential of each elevated terminal might be relatively low. In this case the flow of energy between the elevated terminals is by means of electrostatic induction, i.e. displacement current. For high power transmission the energy flow is by means of true electrical conduction. A potential on the order of 15-million volts is needed on the elevated terminal in order to break down the insulating stratum around and above each plant. An upward-pointing "ray of great ionizing power" might also be required. A terminal potential on the order of 100-million volts will be required for a full-scale earth-resonance system. 

Gary