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An '''active electronically scanned array''' ('''AESA''') is a type of [[phased array]] antenna, which is a computer-controlled [[antenna array]] in which the beam of radio waves can be electronically steered to point in different directions without moving the antenna.<ref>{{Citation |title=The Insane Engineering of the F-35B | date=28 January 2023 |url=https://www.youtube.com/watch?v=1lCOgFPtaZ4 |access-date=2024-02-16 |language=en}}</ref> In the AESA, each antenna element is connected to a small solid-state transmit/receive module (TRM) under the control of a computer, which performs the functions of a [[transmitter]] and/or [[receiver (radio)|receiver]] for the antenna. This contrasts with a [[passive electronically scanned array]] (PESA), in which all the antenna elements are connected to a single transmitter and/or receiver through [[phase shifter]]s under the control of the computer. AESA's main use is in [[radar]], and these are known as active phased-array radar (APAR).
The AESA is a more advanced, sophisticated, second-generation of the original PESA phased-array technology. PESAs can only emit a single beam of radio waves at a single frequency at a time. The PESA must utilize a [[Butler matrix]] if multiple beams are required. The AESA can radiate multiple beams of radio waves at multiple frequencies simultaneously. AESA radars can spread their signal emissions across a wider range of frequencies, which makes them more difficult to detect over [[
==History==
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