Two focused spots merged and then separated

The Radio Wave Display (RWD by Luxondes) shows in real time the waves that pass through it. The TRIMARAN project's prototype of focusing antennas generates a focused radio communication that is visible on the RWD.
Here two focused spots are created, merged and then separated.
More on this:
https://recherche.orange.com/en/focusing-antennas-for-a-green-5g-a-project-awarded-with-the-economic-impact-prize-by-the-french-research-agency/