Aperture efficiency enhancement in a Cassegrain system by means of a dielectric lens

Details Aperture efficiency enhancement in a Cassegrain system by means of a dielectric lens Aperture efficiency enhancement in a Cassegrain system by means of a dielectric lens

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987rasc...22.1091h&link_type=abstract

Radio Science (ISSN 0048-6604), vol. 22, Nov. 1987, p. 1091-1101.

Physics

Optics

2

Apertures, Cassegrain Antennas, Dielectrics, Lens Antennas, Radio Antennas, Antenna Radiation Patterns, Diffraction, Efficiency, Millimeter Waves, Phase Error, Ray Tracing, Wave Reflection

Scientific paper

The overall aperture efficiency of a Cassegrain radio antenna has been boosted by introducing a dielectric lens into the beam. The gain amounts to 0.7 dB, or about 17 percent, at millimeter wavelengths. The lens, of weak optical power but strongly aspherical figure, is placed a short distance in front of the feed. It serves to redistribute the field in the aperture of the telescope, making the amplitude more uniform, with a sharp cutoff at the edge. The aberrations (defocusing and spherical) introduced by the lens are balanced by slightly displacing the secondary mirror. The lens can be adapted to many existing telescopes employing classical paraboloid-hyperboloid optics, at minimal expense.

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