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Re: Tesla Coil RF Transmitter



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


Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

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

The caption associated with the second animation doesn't say anything about the antenna being electrically short. It looks to me like the thing is just drawn to a smaller scale than previously. . . .

. . . The high reactance of the short antenna can be recognized
in the animations by the electric field lines that form loops that grow
and then return to the antenna instead of detaching and forming
electromagnetic waves.

Thanks for explanation. I'm not sure whether to believe it.

. . . Also, these animations represent the operation of a dipole "antenna" (in the sense used above) in free space. This is an inaccurate representation of the launching structure of a Tesla-coil transmitter, which is grounded and by my definition is NOT an "antenna."

The pattern of a grounded antenna is just one half of the pattern of
a dipole antenna, with some distortion due to the nonzero resistance
of the ground.

That's fine for the nearfield, but please show me what the radiation pattern of a grounded quarter-wave monopole radio antenna looks as it transitions to the farfield.


Antonio Carlos M. de Queiroz

Gary Peterson