Simulation of the Optical System for the ASTRO-G Offset Cassegrain Antenna

Details Simulation of the Optical System for the ASTRO-G Offset Cassegrain Antenna Simulation of the Optical System for the ASTRO-G Offset Cassegrain Antenna

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..402...74k&link_type=abstract

Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies ASP Conference Series, Vol. 402, proceedings o

Astronomy and Astrophysics

Astrophysics

Scientific paper

We are developing the satellite (ASTRO-G) for the space VLBI mission, called VSOP-2 (Hirabayashi et al. 2004). This system will have an offset cassegrain antenna, and the three multi-mode feed horns (8, 22, 43 GHz bands) will be chosen by the Cassegrain focus position. We are designing the antenna optics of the three band receivers by using the GRASP physical optics software package on simulated feed configurations. The result of these simulations shows low cross-polarization level, a good radiation pattern, and the antenna efficiencies are 63--68 percent in these bands, assuming a perfect reflector. In this paper, we present these results of simulation of ASTRO-G antenna optics.

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