Alan Peake wrote:

If one were to find lossless material (superconductors?) for the short
antenna and it's corresponding matching network, what would happen as
the antenna became shorter and shorter compared with the half-wave
dipole? Would it simply approach an isotropic radiator?
Alan


If room temperature super-conductors were available, do you even realize
the shape antennas would take? My gawd man, share some of that material
here! The thought alone is inspiring!

Regards,
JS

John Smith wrote:
Alan Peake wrote:

If one were to find lossless material (superconductors?) for the short
antenna and it's corresponding matching network, what would happen as
the antenna became shorter and shorter compared with the half-wave
dipole? Would it simply approach an isotropic radiator?
Alan


If room temperature super-conductors were available, do you even realize
the shape antennas would take? My gawd man, share some of that material
here! The thought alone is inspiring!

Regards,
JS
Don't know what shape it would be but I'm sure I wouldn't recognize it!
Alan

Alan Peake wrote:
"---what would happen as the antenna became shorter and shorter compared
with the half-wave dipole?"

Terman answers that question on page 871 of his 1955 opus:
"The directive gain of the elementary doublet =1.5." For a resonant wire
of 0.5 lambda, the gain is 1.64.

There`s not much difference in directivity as the doublet shrinks to a
vanishingly small size. The gains shown are power ratios, not dB`s.

Comparison antenna is the isotropic of which Terman says:
"Although an isotropic radiator of coherent waves does not exist because
it cannot satisfy Maxwell`s equations, the properties of such an
imaginary antenna are easily visualized, and the concept of an isotropic
radiator is often found useful in the analysis of antenna systems."
(Page 871 in the 1955 opus.)

Best regards, Richard Harrison, KB5WZI