Abstract
Accurate mutual coupling correction is necessary for an array antenna to reach ultralow sidelobe level. If the mutual impedance or mutual coupling coefficient matrix of an array is perfectly known, theoretically, one can compensate the effects of mutual coupling completely and realize the desired low sidelobe level. However, the mutual impedance matrix obtained whether by calculation or by measurement has limited precision, which limits the effectiveness of compensation. This paper deals with the requirements on the precision of mutual impedance for compensation in ultra-low sidelobe array antennas. The relationship between mutual impedance errors and the amplitude and phase errors of an array is derived, by which the relationship between the mutual impedance errors and the sidelobe level is obtained.
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