VSWR reduction for large millimeter-wave Cassegrain radiotelescopes

Details VSWR reduction for large millimeter-wave Cassegrain radiotelescopes VSWR reduction for large millimeter-wave Cassegrain radiotelescopes

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ijimw..12..589p&link_type=abstract

International Journal of Infrared and Millimeter Waves (ISSN 0195-9271), vol. 12, June 1991, p. 589-599.

Physics

Optics

2

Cassegrain Optics, Radio Telescopes, Reflectance, Standing Wave Ratios, Millimeter Waves, Mirrors

Scientific paper

A technique is described which reduces the characteristic modulations of the observed spectrum ('baseline ripple') caused by the multiple reflections in large radiotelescopes. The reflection coefficient gamma for a typical spectroscopic instrument is calculated for both primary and secondary mirrors. The values of the coefficients are determined for the James Clerk Maxwell Telescope (JCMT) for applications of the ripple reduction technique. The reflection coefficient is represented graphically, and methods for reducing its value are discussed. The optimal reflection spiral convergence point is identified and the introduction of a tapered scatterer is discussed. Significant reductions in the reflection coefficient are found over a very broad bandwidth when a tapered absorber is introduced in the center of the secondary mirror. The scattering cones and circular absorbers presently used in radio astronomy are found to be ineffective in terms of reducing the reflection coefficient. The technique is demonstrated to be effective in reducing the baseline ripple to an acceptable level.

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