Active electronically Scanned Array (AESA) radars offer a number of important benefits. By focusing individual elements very quickly and precisely without having to move them physically, and with little signal "leakage" outside of its focused beam, AESA radars gain improved reliability, powerful, and the ability to "timeshare" by switching from mode to mode fast enough to operate different modes at once.
They also have potential applications in electronic warfare, and recent research indicates significant potential for secure, high-bandwidth communications.
At present, the USA is the only country that has AESA radars operating on fighter aircraft, though projects are underway in Britain, and in other areas, European battlefield surveillance radars and NATO's AGS project aim to field such radars shortly.
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