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Re: Tesla Coil RF Transmitter



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


Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

Original poster: William Beaty <billb@xxxxxxxxxx>

. . . Even the shortest antenna must always radiate SOME
electromagnetic waves, and if an impedance-matching network is involved, then far more energy gets out than one might expect.

Indeed.. the radiation resistance gets very small, but if you can keep the loss resistance also small, then the efficiency is still good. What's happening is that the ratio of energy radiated per cycle gets small compared to the energy stored in the antenna and the surrounding fields (the reactive near field).

Of course, the current flowing through the loss resistance of an inefficient "antenna" is, to a Tesla-coil transmitter, the current that is not radiated but trapped within the entire resonating system, including the earth and the distant receiving transformer.


Gary