Beamforming – An Old and Reliable Technology Back in the 1940s, during World War II, beamforming was used to increase sonar and radar range and stability, as well as that of radio waves. Beamforming is a selective process of directional interference that helps focus sensors in a certain direction (routers, antennas, sonars, radars). Beamforming creates two types of interference, constructive and destructive. Constructive interference focuses a transmitter and receiver on a certain angle and for certain frequencies, making them better at communicating for the selected angles and frequencies. Destructive interference eliminates some angles as the correct ones for transmission and on the receiving end, some patterns and frequencies are deemed undesirable, so the receiver does not scan for them.