Eike Lantzsch, ZP6CGE wrote:

Reg Edwards wrote:

There is an antenna with dimensions as small as 1 / 70th ( 1.43 percent) of
a wavelength which has a radiating efficiency as high as 98.0 percent.

It is a vertical copper tube, 1 metre high (39.4 inches), 25.4 mm (1 inch)
in diameter, operating at 7 MHz.

It is only 0.86 dB worse than absolute perfection, equivalent to a loss of
only 1 / 70th of an S-unit.

It is more efficient than a very high half-wave resonant dipole, using 14
awg wire, at the same frequency. And uses a far smaller amount of expensive
copper.

Has anybody ever applied for a patent for such an antenna which has such an
outstanding performance? And did the Patent Examiner raise his eyebrows at
the claim?
----
Reg.




I don't know of any patents, but these "wonder antennas" are so
"efficient" because they use the feedline as a radiator. The feedline
is just terminated with a huge capacity. There is no magic to this -
it is just bad engineering. Good morning RFI!

Kind regards, Eike

It's theoretically possible to make small, highly efficient antennas,
but since the radiation resistance of such antennas is low as well as
the loss resistance, the Q is high and the bandwidth stinks.
73,
Tom Donaly, KA6RUH