Last time I looked at phased array technology it seemed like you need large number of elements to get real gain. At the same time you either need phase control and PA for each element, expensive. Or high power phase control which is inefficient. And still not cheap.
One gets dubious real quick considering the incentive there is to develop affordable beam steering technology. And the lack of examples outside of a few niche area's.
You need lots of antennae to get high directivity with phased arrays.
A millimeter wave (very small lambda) wafer scale (giant chip = super expensive) phased array integrated onto a chip achieves a half power beamwidth of around 6 degrees.
One gets dubious real quick considering the incentive there is to develop affordable beam steering technology. And the lack of examples outside of a few niche area's.