Development of a wideband receiver for dual-band and dual-polarization observations in 230 and 345 GHz bands

Sho Masui; Sana Kawashita; Yasumasa Yamasaki; Yutaka Hasegawa; Takafumi Kojima; Takeru Matsumoto; Ikko Fujitomo; Yuma Nishikawa; Ryo Nakagawa; Hideo Ogawa; Toshikazu Onishi

doi:10.1117/12.3018561

16 August 2024 Development of a wideband receiver for dual-band and dual-polarization observations in 230 and 345 GHz bands

Sho Masui, Sana Kawashita, Yasumasa Yamasaki, Yutaka Hasegawa, Takafumi Kojima, Takeru Matsumoto, Ikko Fujitomo, Yuma Nishikawa, Ryo Nakagawa, Hideo Ogawa, Toshikazu Onishi

Author Affiliations +

Proceedings Volume 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII; 131022L (2024) https://doi.org/10.1117/12.3018561
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We have been developing a wideband heterodyne receiver for simultaneous observations in isotopologue CO lines of J = 2–1 and J = 3–2 transitions with dual-polarization. To achieve these simultaneous observations, a wideband frequency separation system was required in the radio frequency circuit because the intermediate frequency range of the superconductor-insulator-superconductor mixer is narrower than the frequency range of the CO lines from J = 2–1 to J = 3–2. As the frequency separation system, a waveguide multiplexer that connects three types of diplexers was applied. The prototype multiplexer was already developed and installed in the 1.85-m radio telescope. Then, we succeeded in commissioning observations simultaneously in 230 and 345 GHz bands with single polarization. We are currently working on improving the multiplexer and developing a 90° differential phase shifter and a wideband orthomode transducer (OMT). The 90° differential phase shifter and OMT can be combined to operate as a circular polarizer. We are planning to realize observations of both linearly and circularly polarized waves by using the OMT and circular polarizer, respectively. A part of this development can contribute to the future development of Atacama Large millimeter/submillimeter Array and Very Long Baseline Interferometry telescopes. In this paper, we describe the development of the prototype wideband receiver and the development status of the OMT, circular polarizer, and a new multiplexer.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Sho Masui, Sana Kawashita, Yasumasa Yamasaki, Yutaka Hasegawa, Takafumi Kojima, Takeru Matsumoto, Ikko Fujitomo, Yuma Nishikawa, Ryo Nakagawa, Hideo Ogawa, and Toshikazu Onishi "Development of a wideband receiver for dual-band and dual-polarization observations in 230 and 345 GHz bands", Proc. SPIE 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 131022L (16 August 2024); https://doi.org/10.1117/12.3018561

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