给出该孔径的光瞳函数以及三种不同型的结构形式，并导出它的调制传递函数的解析表达式。
The pupil function, analytical formulas of its corresponding modulation transfer function (MTF) and three configuration models have been given.
模拟结果表明，利用三环相位光瞳滤波器，不仅可以在焦面上实现光强的平顶分布，而且还可以得到单环衍射光束。
The results indicate that flat-top beam shaping and single-circle beam shaping at the focal plane can all be realized by using three-zone annular phase pupil filters.
通过数值模拟，使用新的参数t, w讨论确定了三区二元相位型光瞳滤波器的超分辨区域。
New parameters (t, w) are used to determine the superresolution region of three zones annular binary phase filter through numerical simulations.
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