In antenna theory, a phased array consists of many small antennas, positioned in an array, next to each other. Instead of sending a radio wave with one antenna, a computer system can shift the phase of the original wave by fractions of a wavelength for each individual antenna in the array. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.