The influences of the random error and mechanical distortion on the electromagnetic performances of phased array antenna (PAA) are of great significance to the research on and development of the high-performance antennas. A coupled structural-electromagnetic model of PAA is developed to describe the effect of random error and mechanical distortion on the performances of antenna. The application of the model to a planar array antenna demonstrates the variation of the sidelobe level and gain with different random errors and different distortion grades respectively. The valuable results provide a theoretical guidance for the engineer to determine the optimal performance-driven structural tolerance.
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