Title :
Development of the 787–950 GHz ALMA Band 10 cartridge
Author :
Uzawa, Y. ; Kojima, T. ; Kroug, M. ; Fujii, Y. ; Candotti, M. ; Shan, W.-L. ; Takeda, M. ; Kaneko, K. ; Shitov, S. ; Wang, M.J.
Author_Institution :
Nat. Astron. Obs. of Japan, Tokyo
Abstract :
We are developing the Atacama large millimeter/submillimeter array (ALMA) band 10 (787-950 GHz) receiver cartridge. The double-side-band (DSB) mixer consists of a corrugated feed horn, a full-height waveguide mixer block and a Nb(Ti)N-based superconductor-insulator-superconductor (SIS) mixer chip. The IF system uses a 4-12-GHz cooled low-noise InP-based MMIC amplifier and a 4-12-GHz isolator. Heterodyne sensitivity tests showed the mixer noise temperature of about 200 K in the 800 GHz band at an operating temperature of 4 K. This result is comparable to the state-of-the-art mixer performance at this frequency range.
Keywords :
MMIC amplifiers; heterodyne detection; millimetre wave mixers; radiotelescopes; superconductor-insulator-superconductor mixers; Atacama large millimeter array; Atacama large submillimeter array; MMIC amplifier; corrugated feed horn; double-side-band mixer; frequency 4 GHz to 12 GHz; frequency 787 GHz to 950 GHz; full-height waveguide mixer block; heterodyne senstivity; isolator; mixer noise temperature; receiver cartridge; superconductor-insulator-superconductor mixer chip; temperature 4 K; Feeds; Frequency; Isolators; Low-noise amplifiers; MMICs; Superconducting device noise; Superconducting devices; Temperature distribution; Temperature sensors; Testing;
Conference_Titel :
Infrared, Millimeter and Terahertz Waves, 2008. IRMMW-THz 2008. 33rd International Conference on
Conference_Location :
Pasadena, CA
Print_ISBN :
978-1-4244-2119-0
Electronic_ISBN :
978-1-4244-2120-6
DOI :
10.1109/ICIMW.2008.4665698
