Antenna:          1 serial resonance circuit
The size of the metal surface (capacitance C) must be in a certain relation to the inductance L of the coil at the applied frequency (Thomson formula). The capacitive and inductive impedances must be equal in size and in opposite directions, thus cancelling each other out. Then we have resonance.

In the first quarter wave period (area 1) of the voltage applied to the antenna (0-90 degree of phase), the radiator (the metal surface) is charged up to the highest voltage at 90 degree of phase.

When it is now fully charged, the radiator (the metal surface) is de-energized and the transmission energy is completely stored in the electrical field that has been created.

In the second quarter wave period (area 2) of the voltage (90-180 degree phase) the voltage on the metal surface decreases and it discharges. The field energy is radiated coherently.

                2 serial resonance circuits:

 Between 2 resonant circuits there is a wireless transfer of energy via the capacitances.