Sure it's possible. It's just not efficient, practical, reliable, or safe (at high power levels).

Might not be very efficient but it's practical if you need a 24/7 flying drone.

Tethered aerostats or solar power are better solutions than beamed power if you need something flying for a long time.

Airbus has a patent on that: https://patents.google.com/patent/FR3012923A1/en

Jesus, how come such things can be patentable?

Just to be clear most of the directional wireless power transfer techniques rely upon a large receiving "aperture" so that the inverse square law's "spread-ened" radiation can be more fully captured. Acceptable RF exposures are far too low for this to work in smartphones and in ultrasonics it's quite dangerous even at MPE of 100dB (OSHA 145dB is for max 15 minutes a day iirc)

Wi-charge uses lasers. Wanna guess how efficient and cheap high power IR lasers and GaAs solar panels are?