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- W1862401805 abstract "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." @default.
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- W1862401805 date "2009-03-23" @default.
- W1862401805 modified "2023-10-01" @default.
- W1862401805 title "Near-field beam pattern measurement of ALMA band 8 (385 – 500 GHz) first cartridge" @default.
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