Long slot arrays - part 2: ultra wideband test results

A wideband long slot array was recently developed for radar and EW applications. Theoretically the new design has unlimited bandwidth if no ground plane is included but at the expense of 3 dB loss in gain because of bi-directional radiation. In practice, however, a ground plane is used which limits the bandwidth to about 5:1. Ground plane effects and the test results of a UHF array with 4/spl times/8 feed elements over a finite (1.12 m /spl times/ 2.24 m) aperture are presented.