Earlier phased array radars only used one phase shifter per element (or per group of say 4 elements or so, known as a sub-array), nothing active. There are different levels of complexity.

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Today phased arrays are in all sorts of radio equipment from broadcast radio transmitters to WiFi routers and 5G phones. The technique even has uses in optics and acoustics.

Active Electronically Scanned Arrays (AESAs) used in radar systems typically use digital receiver exciters (DREX) units. Functional testing of DREX units can be challenging due to their complexity.

Airborne phased array radar could spur a “quantum leap” in hurricane forecasts August 19, 2014 Satellite view of Hurricane Iselle on August 4, 2014 in the eastern Pacific (NOAA) ...

I’ve been involved with phased arrays of IR emitters, so the topic does intrigue me. If my math is correct, the wavelength for 60GHz is 5mm. A 5 x 5 array in a small size is impressive! ... Gadget ...

Rear Adm. Michael Silah, the director of NOAA’s office of marine and aviation operations, explained that NOAA has been relying on NCAR’s development of phased-array radar as a proving ground ...