Passive electronically scanned array: Difference between revisions

Revision as of 01:21, 18 June 2008

Revision as of 19:24, 12 July 2008

Line 1:

A '''passive electronically scanned array''' (PESA), as opposed to its active counterpart [[AESA]], is a [[phased array]] which has a '''central''' [[radiofrequency|RFradiofrequency]] source (such as a [[magnetron]], a [[klystron]] or a [[travelling wave tube]]), sending energy into (usually digitally-controlled) [[phase shift module]]s, which then send energy into the various emitting elements in the front of the [[antenna (radio)|antenna]]. AESA devices, in contrast, have each of their elements contain its own RFradiofrequency source. A PESA radar is therefore simpler to construct than an AESA.

Most phased array radars in the world are PESA. [[Microwave Landing System]] uses PESA transmit-only arrays.