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Planar lens antenna with multilevel band-pass unit-cells

Abstract:

This paper presents a non-uniform frequency selective surface (FSS) working as a low-profile planar lens antenna. The FSS is designed using multilayer band-pass unit cells, in contrast to previously-designed planar lenses with multilayer metallic hole arrays. The advantage of the new unit cell resides in its smaller size compared to the metallic holes. These smaller cells provide a better control of the phase in the transmitted signal and, hence, a better performance in the complete planar structure. The fabrication of the new planar lens is straightforward since it just consists of several metallic layers, which facilitates the frequency scaling of the lens. This paper is focused on the behavior of the band-pass unit cell in front of the metallic holes, and presents a first design of a planar lens with band-pass unit cells.