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The effects of some mechanical uncertainties on the performance of welded and machined phased array antennas

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4 Author(s)
Eskelinen, P. ; Helsinki Univ. of Technol., Espoo, Finland ; Eskelinen, H. ; Eskelinen, A. ; Tilhonen, K.

Cost-effective manufacturing possibilities and inherent mechanical strength suggest the use of sheet metal constructions in large-size phased array antennas up to 3 GHz and above, applied both for civilian and military communication and radar systems. Constructional defects cause phase and amplitude errors which impair the radiation pattern by introducing non-symmetrical lobes and by filling wanted minima possibly up to -10 dB or creating phantom ones. Random phase deviations up to 60 degrees have been measured and gain variations of 2-3 dB are not rare. Typical faults include bends in the sheet structure due to welding and improperly aligned transmission line junctions in internal machined modules. A mathematical real-time compensation of most of these errors is feasible although in some cases this does not cure the actual fault but just masks the problem

Published in:

Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480)  (Volume:2 )

Date of Conference:

2001