The experiment will convert solar power into radio frequency microwave energy which could then be transmitted to the ground.
Why not let the solar energy make its own way to earth and then collect it in a big, really big, I'm talking collectors the size you have never seen before, and take away the need for having a steerable antenna on the X-37B that has to direct the microwaves to a specific receiver. And gawd help any bird or plane that flies through that beam of energy going fast, really fast, 17 times faster than any energy that any president has ever tweeted about before. But perhaps there is another use for it - the Death Ray that can be aimed at Sleepy Joe or his bestest friend ever, whats'is name in Korea.