Multibeam Truncated Gutman Lens based on Additive Manufacturing

The lenses with a gradient refractive index become the alternative to the traditional homogeneous dielectric lenses. It can be fabricated using additive manufacturing. Some of the types of the lens support the multibeam operation or beam scanning capability by placing several feed antennas to the focal surface. In comparison with the Luneburg lens, in which the feeds are placed on a spherical focal surface, the truncated Gutman lens allows to avoid conformal antenna placement and used the planar structure of the feed antennas. In this paper, the influence of the truncation on the Gutman lens performance for a multibeam application is considered based on full-wave electromagnetic simulation. The approaches for Gutman lens design using 3D printing are proposed.