EA7401AS Stacked Linear Array

EA7401AS is a dual antenna designed for combined sea and air surveillance. It is ideal for coastal surveillance radar applications where monitoring of air targets is required.

The antenna consists of two linear arrays stacked on top of each other. The lower array has inverse cosec2 elevation radiation pattern to -40º, providing excellent coverage of sea surface. The upper array has cosec2 radiation pattern, suitable for tracking air targets.

Operating in the marine and port X-band, this antenna uses techniques developed from cellular radio technology to provide a unique combination of RF performance, compact size and low weight.

The antenna provides azimuth resolution of about 0.32º, whilst transmitting both long and short pulses. The short pulse capability of < 40 ns enables excellent resolution on very short range targets, performance not possible with conventional large slotted waveguide antennas.

Unlike slotted waveguide antennas, the EA7401AS antenna azimuth beam pointing angle is independent of RF frequency, therefore this antenna does not suffer from beam squint with change in frequency, making it suitable for dual diversity and frequency agile systems.

The EA7401AS antenna is available with either fixed circular or fixed horizontal polarisation.