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最近几十年来,旋转或扇扫天线已成为用以辨别雷达的显著特征,但是现在雷达机扫天线正逐渐被电扫描天线所取代。电扫描天线可实现几乎瞬时的波束控制,目前分为被动和主动两种形式,分别称作无源电扫描阵列(PESA)和有源电扫描阵列(AESA)。从PESA到AESA PESA天线阵列采用移相器。与常规的电扫描天线一样,PESA天线阵列采用一个独立的大功率发射机馈电。当单片微波集成电路(MMIC)技术使制造更小的天线单元成为可能,使每个单元都可配备独立的有源发射和接收
In recent decades, rotating or fanning antennas have become prominent features for distinguishing radars, but radar antennae are now being replaced by electrosonde antennas. Electrically scanned antennas provide near-instantaneous beam steering and are currently classified as passive and active (PESA) and active electrical scanning (AESA), respectively. Phase shifters are used from PESA to AESA PESA antenna arrays. As with conventional electro-scan antennas, the PESA antenna array uses a separate, high-power transmitter feed. While monolithic microwave integrated circuit (MMIC) technology has made it possible to manufacture smaller antenna units, each unit can be equipped with independent active transmit and receive