Physics – Optics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ipmap.133...43l&link_type=abstract
IEE Proceedings, Part H - Microwaves, Antennas and Propagation (ISSN 0143-7097), vol. 133, pt. H, no. 1, Feb. 1986, p. 43-49. SE
Physics
Optics
1
Antenna Design, Cassegrain Antennas, Radio Telescopes, Support Interference, Blocking, Geometrical Optics, Millimeter Waves
Scientific paper
In large Cassegrain antennas careful design is requied to minimize the detrimental effects on the antenna performance caused by blocking of the radiation by the subreflector support. A study of the aperture blocking by some possible support structures has been carried out for the United Kindgom/Netherlands millimeterwave telescope antenna which has very stringent mechanical specifications. By examining the dependence of the blockage on the structural geometry adn analyzing the mechanical performance, an optimum structure has been achieved. Although the structure is required to support a secondary, which oscillates at up to 15 Hz without causing any spurious movements which are significant in comparison to the 0.4 mm shortest operating wavelength, the loss of gain has been kept down to 7.4 percent.
Lamb James W.
Olver A. D.
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