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$\begingroup$ Even the infinitesimal long Hertzian dipole that is resonant at no frequency can radiate. The length of an antenna has to do with the bandwidth at which it can radiate not the frequency. An antenna is not a resonator, an antenna is a matching circuit between the source generator's impedance (or the receiver's load impedance) and the $120\pi \Omega$ impedance of the TEM waves in vacuum. See my answer physics.stackexchange.com/questions/449947/… $\endgroup$
– hyportnex
Commented Jul 5 at 12:27
1

$\begingroup$ @hyportnex 'Even the infinitesimal long Hertzian dipole that is resonant at no frequency can radiate.' This comment is correct but irrelevant. 'An antenna is not a resonator' This comment contradicts with what I read on en.wikipedia.org/wiki/…, for which Kraus, J.D., w8jk (1988). Antennas (2nd ed.) is the reference. $\endgroup$
– my2cts
Commented Jul 5 at 21:37
$\begingroup$ @hyportnex Fig. 5.7 at page 139 shows how various dipole antenna lengths create standing wave current patterns. Your comment also contradicts Kraus, a physicist, pioneer and world famous designer of antennas, author of the Antenna Bible. And isn't a lot of energy concentrated in a small bandwidth exactly the same thing as resonance? $\endgroup$
– my2cts
Commented Jul 5 at 21:54
1

$\begingroup$ The length of a dipole antenna can be chosen so the antenna is resonant. It frequently is chosen otherwise. $\endgroup$
– hobbs
Commented Jul 5 at 23:29
1

$\begingroup$ This should be the accepted answer. Other answers goes into a lot if details without even mentioning the wave speed in the conductor. $\endgroup$
– blupp
Commented Jul 7 at 15:36

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