Create electromagnetic waves using Lc tank circuit
Consider a disk capacitor  &quot;shorted&quot; with an external
loop. Even if the
external loop has no resistance, there is some inductance
associated with the loop, and therefore the discharge
can lead to an oscillation at a frequency determined by
the inductance and capacitance of this structure. If this
loop is sufficiently large compared to the free space
wavelength at the frequency of this oscillation, the loop
will radiate appreciably as a magnetic dipole, with a
sizable radiation resistance. - thanks to R. C. Levine, &quot;Apparent Nonconservation of Energy in the Discharge of an Ideal Capacitor,&quot; in IEEE Transactions on Education, vol. 10, no. 4, pp. 197-202, Dec. 1967, doi: 10.1109/TE.1967.4320288.