一、前言许多设计原则在电磁频谱中的微波和光学二个领域中是通用的。因此,很多用以设计透镜和反射器的光学方法,已经被用来把微波辐射聚集成定向波束。龙伯透镜却是一个例外,它的实际应用只局限在微波领域。其原因在于这球形透镜以径向对称的方式要求非均匀的折射率分布。在微波频段,龙伯透镜已经用两种 I. INTRODUCTION Many design principles are common in both microwave and optics in the electromagnetic spectrum. Therefore, many optical methods for designing lenses and reflectors have been used to concentrate microwave radiation into directional beams. Long Bo lens is an exception, its practical application is limited to the microwave field. The reason for this is that this spherical lens requires a non-uniform refractive index profile in a radially symmetrical manner. In the microwave band, Long Bo lens has been used in two