An array antenna system (10) for producing beams with widths constant with scan angle is fed by a microwave lens (12). The beam ports (20₁, ...20₁₁) of the lens (12) are disposed along an arc (16) displaced from the focal arc (22) of the lens (12) The distance ( f) between the displaced arc (16) and the focal arc (22) decreases from a maximum amount at the center of the lens (12) to a minimum amount where the displaced arc (16) intersects the focal arc (22).
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