En '''''active electronically scanned array''''' (akronym '''AESA''', men også set kaldet '''''Active Electronically Steered Arrays''''') er et antal [[radioantenne]]r samlet i en gruppe og styret elektronisk.<ref name="bliley">[https://blog.bliley.com/understanding-aesa-radar-tech Sep 12, 2017, blog.bliley.com: Understanding AESA: A Game-Changer in RADAR Technology] Citat: "...Active Electronically Scanned Arrays are considered a phased array system, which consists of an array of antennas which form a beam of radio waves that can be aimed in different directions without physically moving the antennae themselves. The primary use of AESA technology is in radar systems....", [https://web.archive.org/web/20190610060008/https://blog.bliley.com/understanding-aesa-radar-tech backup]</ref>
Hver enkelt radioantenne har et tilhørende [[radiosender|sende]]/[[radiomodtager|modtage]]-modul (kort TRM, TR fra engelsk ''transmit/receive-module''), hvilket gør hver radioantenne i stand til at sende og modtage radiosignaler uafhængigt af de øvrige antenner i gruppen.
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