For planar array-fed arrays, the center feed outperforms an end feed due to its inherent geometric symmetry, the compelling low-sidelobe beamshape of the principal eigenmode (maximum power transfer between the two arrays), and a smaller optimum focal length.
https://arxiv.org/pdf/2307.16446
Higher order (even) eigenmodes cause a null at the passive array (reflectarray/transmitarray) center, which seems counterintuitive for a typical space feed, e.g., with ``legacy'' horns. Any technical comment/s?
https://ieeexplore.ieee.org/document/10279595
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