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对聚焦圆口径天线的近轴场进行计算。利用分部积分法导出了圆口径天线近轴聚焦(辐射)场的通用解析表达式。焦平面具有和远区完全相同的场表达式,焦斑包含了占总辐射功率47%的能量传输,焦距越小焦班越小,能量也就愈集中。对振幅均匀和坡变分布的圆口径天线聚焦特性作数值计算并相互比较,总结聚焦特性。
Calculate the paraxial field of the focused circular aperture antenna. By using the integral integral method, a general analytical expression for the paraxial focusing (radiation) field of a circular aperture antenna is derived. The focal plane has exactly the same field expression as the far field, and the focal spot contains 47% of the total radiated power. The smaller the focal length is, the smaller the focal length is and the more energy is concentrated. The focusing characteristics of the circular-aperture antenna with uniform amplitude and gradient distribution are numerically calculated and compared with each other to summarize the focusing characteristics.