Abstract
The paper presents a dual layer planar gradient lens that transforms point feed element located at the lower layer into a surface plane wave at the upper layer. Thus feed elements do not prevent plane wave radiation into free space and effect of shading is excluded. Therefore dual layer lens potentially provides 3600 degree sector of observation in contrast to a conventional single layer planar gradient lens which observation sector is limited by the effect of shading. This paper presents an approach for dual layer Morgan lens synthesis based on symmetry principle and coupled mode theory. This approach gives spatial distribution of planar waveguides generalized parameters: propagation constant and coupling coefficient. The second stage of synthesis procedure is structural synthesis that gives one spatial distribution of planar waveguides geometrical parameters. This stage is presented for particular case of a coupled planar dielectric waveguides.
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