Quasi-optical attenuators for ALMA band 10 receiver

Author

Gonzalez, Alvaro ; Fujii, Yasunori ; Kaneko, Keiko ; Uzawa, Yoshinori

Author_Institution

ALMA Band 10 Group, Nat. Astron. Obs. of Japan, Tokyo, Japan

fYear

2011

Firstpage

1977

Lastpage

1980

Abstract

Simple quasi-optical attenuators based on beam truncation have been designed, fabricated and tried on ALMA band 10 receivers (787-950 GHz) with optimal results. The design is based on physical-optics simulations considering effects of diffraction. The use of these attenuators allows flexibility in the design of the local oscillator (LO) quasi-optical injection scheme depending on the specific performance of components for each of the 73 ALMA band 10 receivers. In particular, they have proven very effective to keep system noise within the stringent ALMA requirements (230 K at 80% of 787-950 GHz band).

Keywords

electromagnetic wave diffraction; optical attenuators; submillimetre wave oscillators; submillimetre wave receivers; ALMA band 10 receiver; Atacama large millimeter/submillimeter array; bandwidth 787 GHz to 950 GHz; beam truncation; diffraction; local oscillator; physical-optics simulation; quasioptical attenuator; quasioptical injection scheme; quasioptical waveguide; submillimeter wave technology; temperature 230 K; Attenuation; Attenuation measurement; Attenuators; Mixers; Noise; Receivers; Temperature measurement; Atacama Large Millimeter/submillimeter Array; Gaussian beams; Quasi-optical waveguides; Submillimeter wave measurements; Submillimeter wave technology;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference Proceedings (APMC), 2011 Asia-Pacific

Conference_Location

Melbourne, VIC

Print_ISBN

978-1-4577-2034-5

Type

conf

Filename

6174166