Blockage minimization in Cassegrain and Gregorian reflectors with increased flexibility

A different approach in designing symmetric Cassegrain and Gregorian antennas is presented in this work. The main purpose in the design is to minimize blockage with increased flexibility in the reflector shape. The subreflector shape (in the plane) is somewhat arbitrary and can be circular, flat or any other curved shape, which can be selected by considering the required application. The reflector shape can be determined according to the selected subreflector. The design is based on blockage minimization. The simulation results and a comparison with conventional antennas show a reduction in phase error over the aperture as well. It is also possible to control the parameters of the geometry and reduce and control the diffraction from reflector and subreflector in the proposed design. Spillover can be controlled and the overall improvement in the efficiency can be achieved.