It is possible, but maybe not practical.
Consider a parabolic dish receiver. The idea is that signals arriving at the dish in a parallel path are concentrated on the focus. This works well for distant targets such as planets or stars. The light (or radio waves) coming from distant targets is extremely close to arriving in parallel paths. (Diagram from the wiki page.)
So if you put a radio wave source (such as the sort of thing that produces the microwaves in a microwave oven) at the focus, and point it at the dish, it will reflect and come out as a parallel beam.
The required size of the dish has to be many wavelengths or you don't get any useful area or reflection. So radio in the 1 cm range needs a meter-ish sized dish.
And there is the difficulty. Your source has to tolerate a density of radiation energy that is necessarily many times larger than in the beam. The dish can make the beam parallel, but spreads it out over a large area.
There is some limited ability to tweak the shape of the dish so you get a concentration at some distance. That is, instead of the beam going out parallel, it goes out converging. This is not a trivial task since it will require a complicated shape to get a good focus.
You could possibly arrange for it to be deformable, possibly controlled by some sort of servo mechanism, in turn run by a computer. Otherwise the focus will be at a fixed distance, and either farther or closer the beam will be very low energy density. This is getting to be a pretty complicated thing. And it's getting heavy.
Also, putting the source slightly in front of or behind the focus, you can make the beam converge or diverge, at the expense of spoiling the focus slightly. So you lose a little energy density but allow the beam to concentrate somewhat.
There are also limits on how concentrated such a thing can be. Basically, the limit is very roughly that you can't concentrate more than the source you started with. It's the old thing about a magnifying glass cannot concentrate light beyond a certain limit. Maybe that's enough for some purposes.