Receiver-beam characterization for the SMA

Details Receiver-beam characterization for the SMA Receiver-beam characterization for the SMA

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3357..106c&link_type=abstract

Proc. SPIE Vol. 3357, p. 106-113, Advanced Technology MMW, Radio, and Terahertz Telescopes, Thomas G. Phillips; Ed.

Astronomy and Astrophysics

Astronomy

5

Scientific paper

This paper describes the measurement and subsequent data analysis of the signal beam of the receiver system of the Submillimeter Array (SMA). To measure the receiver beam patterns, a 2-axis planar scanning stage is mounted on top of the receiver assembly. Scanning in a plane orthogonal to the optical path, the near-field measuring system maps out both the amplitude and phase at frequencies of 242 and 265 GHz. By analyzing the measured patterns we can inspect the alignment of an individual receiver, and the optical assembly common to all frequency bands. The data also allows us to determine how the receiver couples to the beam waveguide that feeds the SMA antennas. The measured beam patterns of two different receivers, covering frequency bands of 176 - 256 and 250 - 350 GHz, are presented, as well as the analysis of these data. We believe that this is the first time such a rigorous full vectorial radio alignment technique has been applied to millimeter or submillimeter receiving systems for radio astronomy.

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