Active Phased Array Radar
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Active Phased Array Radar (APAR) is a shipborne active electronically scanned array multifunction 3D radar (MFR) developed and manufactured by Thales Nederland. The radar receiver modules are developed and built in the US by the Sanmina Corporation.
APAR mounted on top of the German Navy Sachsen class frigate Hamburg's superstructure
Rear side of APAR on board the German Navy Sachsen class frigate Hessen
APAR aboard the Royal Netherlands Navy De Zeven Provinciën class frigate HNLMS Tromp
APAR aboard the German Navy Sachsen class frigate Hessen at Kiel Week 2007
Active electronically scanned array
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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. 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 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 shifters under the control of the computer. AESA's main use is in radar, and these are known as active phased array radar (APAR).
The Eurofighter Typhoon combat aircraft with its nose fairing removed, revealing its Euroradar CAPTOR AESA radar antenna
ZMAR concept sketch, 1962
An aerial view of the three domes of the Multifunction Array Radar prototype, surrounded by a clutter fence, at White Sands Missile Range, N.M.
Sketch of the FLAT TWIN antiballistic missile radar