The satellites would be in geostationary, with phased-array transmitters, focused by a reference signal from the ground target. They actually could be repointed

The satellites would be in geostationary, with phased-array transmitters, focused by a reference signal from the ground target. They actually could be repointed to various receivers. The ground stations would be relatively cheap so it wouldn't be all that important to maximize their utilization. (Source: The Case for Space Solar Power)