A tilted, displaced elliptical sub-reflector in an on-axis dual-reflector design is shown by simulation to reduce blockage, give a 40 cm scan at 2 m standoff, and refocus with small feed shifts.
Multibeam compact dual reflectarray antenna for high-throughput satellites in ka-band,
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Confocal Ellipsoidal Reflectors with Phased Array Vivaldi Antenna Source for Imaging Systems
A tilted, displaced elliptical sub-reflector in an on-axis dual-reflector design is shown by simulation to reduce blockage, give a 40 cm scan at 2 m standoff, and refocus with small feed shifts.