4 December 2017 Avoidance of edge diffraction effects of WGM-fed quasi-optical antennas by feed waveguide deformation
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Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15767I (2017) https://doi.org/10.1117/12.2297983
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland
Abstract
To avoid edge diffraction effects of quasi-optical aperture antennas serving as launchers for helically propagating modes [1] - which can in geometrical optics be approximated as rays forming a circular caustic - the aperture distribution has to be tailored such that the output rays are Gaussian-like distributed along the caustic. This can be achieved by slight deformations of the launcher feed waveguide.

A system of differential equations to optimize the shape of the deformations is derived. These formulas also can be applied for the design of any system containing two reflectors. We present numerical results for practical designs of launchers for rotating higher order volume modes.
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A. Möbius, "Avoidance of edge diffraction effects of WGM-fed quasi-optical antennas by feed waveguide deformation", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15767I (4 December 2017); doi: 10.1117/12.2297983; https://doi.org/10.1117/12.2297983
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