Near-field Beam Pattern Measurement of ALMA Band 8 (385 - 500 GHz) First Cartridge

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 5Language: englishTyp: PDF

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Naruse, Masato; Sekimoto, Yutaro; Kamikura, Mamoru (Department of Astronomy, University of Tokyo)
Naruse, Masato; Sekimoto, Yutaro; Kamikura, Mamoru; Sugimoto, Masahiro; Ito, Tetsuya; Satou, Naohisa; Kumagai, Kazuyoshi; Iizuka, Yoshizo; Fujimoto, Yasuhiro (Advanced Technology Center, National astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan)

In this paper, the optical performance of the ALMA Band 8 (385 -500 GHz) cartridge receiver (S/N 01), which is the first one of 80 shipments, was investigated. ALMA Band 8 cartridge receiver consists of a corrugated horn, an Ortho-Mode Transducer, an elliptical mirror, a local oscillator, IF amplifiers, and superconducting-insulator-superconducting (SIS) mixers which cover IF frequency range from 4 to 8 GHz. The amplitude and phase of electric field at near-field were probed, and then the far-field co-polar and cross-polar patterns of the receiver were transferred. The far-field patterns are symmetrical, low side-lobe and compatible with physical optics simulations down to -30 dB. We confirmed that the aperture efficiency at sub-reflector of 12-m antenna are around 80 % and cross-pol. efficiency are about -20 dB at five frequencies.