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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.

https://ieeexplore.ieee.org/document/7747488

For good millimeter wave RF you usually need either III-Vs or SOI. Those wafers are expensive.




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