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Long slot arrays - Part 2: Ultra wideband test results

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Author: Lee, J.J. · Livingston, S. · Koenig, R. · Nagata, D. · Lai, L. · Neto, A.
Institution: TNO Defensie en Veiligheid
Source:2005 IEEE Antennas and Propagation Society International Symposium and USNC/URSI Meeting, 3 July 2005 through 8 July 2005, Washington, DC, Conference code: 69115, 1 A, 586-589
Identifier: 238947
doi: doi:10.1109/APS.2005.1551387
Article number: No.: 1551387
Keywords: Radar · Antenna grounds · Bandwidth · Directional patterns (antenna) · Radar · Bi-directional radiation · Feed elements · Ultra wideband tests · Slot antennas


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 4×8 feed elements over a finite (1.12 m × 2.24 m) aperture are presented. © 2005 IEEE.