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In this paper we present the design of a flat-base Luneburg type of lensantenna, designed for wide angle scan. The antenna consists of a 11-layer lens,fed at its base by a 6x6 array of waveguides. The lens is broadband and has ahigh aperture efficiency, only 1 dB below that of a reference aperture antennawith uniform amplitude and phase distributions. Its sidelobe level is -21 dB atboresight and -13 dB when the scan angle is 64 degrees. It shows goodperformance when compared to the flat Luneburg lens previously reported in theliterature, in terms of gain, scan capability, as well as ease of fabrication.It is shown to have the capability of producing multiple beams simultaneously,multiple angle, scan capability. Two different methodologies have been used todesign the 6x6 feed array of waveguides for the lens. The first of theseutilizes a conventional perfect electric conductor (PEC) waveguide, while thesecond employs materials for the guided wave region that have a highpermittivity at frequencies at which metals become lossy and plasmonic. Theperformance of the lens has been investigated in this paper for both of thesefeed array designs.

Flat-Base Broadband Multibeam Luneburg Lens for Wide Angle Scan