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本文求解了一些改进型龙伯透镜的电磁场。为改善龙伯透镜低频段的方向性,可选择介电常数的分布,其透镜直径约为波长量级。用惠更斯源激励,对它们的方向性作为透镜分布参量的函数予以计算,并得到一定程度的性能改善。还计算了透镜的辐射方向图,并将它与标准龙伯透镜进行比较。为了检验改进型透镜在用实际馈源激励时它们具有的性能,本文介绍了选用终端开路矩形波导作馈源情况下计算的辐射方向图。为了简化这种计算,用二维惠更斯源阵列代替激励波导。
This paper solves some of the improved Long Bo lens electromagnetic field. In order to improve the directivity of the low-frequency region of the Long Bo lens, the dielectric constant distribution can be selected, and the diameter of the lens is about the wavelength. Using the Huygens source excitation, their directivity is calculated as a function of lens distribution parameters and a certain degree of performance improvement is obtained. The radiation pattern of the lens was also calculated and compared with a standard Long Bo lens. In order to test the performance of the modified lenses when they are excited with an actual feed, this paper presents a radiation pattern calculated using an open ended rectangular waveguide as a feed. To simplify this calculation, a two-dimensional Huygens source array is used instead of the excitation waveguide.