An array of antennas whose intermediate frequency voltages are all combined after appropriate delays and then detected with a square law detector. This creates a synthesized beam at the array center. Phased arrays are useful for very long baseline interferometry and spectroscopy. Unlike correlator arrays, phased arrays generate autocorrelations as well as cross correlations.
References
Perley, R.; Schwab, F.; and Bridle, A. Synthesis Imaging in Radio Astronomy: Third NRAO Summer School, 1988. San Francisco, CA: Astronomical Society of the Pacific, p. 101, 1988.
