US Patent 11050158 Dielectric lens

A Luneburg antenna device includes a dielectric lens and an array antenna. The dielectric lens is a laminate of a plurality of disc members having distribution of permittivity varying with respect to its radial direction. Each of the disc members includes a planar section in which a thickness dimension of a radially outer area is smaller than a thickness dimension of a radially inner area and a fin section which extends in a radial manner from a central portion of the planar section toward a radially outer side and in which a radially inner area and a radially outer area have the same thickness dimension.