Antenna pattern measurements of a LiteBIRD low-frequency telescope scaled antenna in a cryogenic chamber

Hayato Takakura; Yutaro Sekimoto; Kimihide Odagiri; Rion Takahashi; Fumiya Miura; Frederick Matsuda; Shugo Oguri

doi:10.1117/12.3019749

23 August 2024 Antenna pattern measurements of a LiteBIRD low-frequency telescope scaled antenna in a cryogenic chamber

Hayato Takakura, Yutaro Sekimoto, Kimihide Odagiri, Rion Takahashi, Fumiya Miura, Frederick Matsuda, Shugo Oguri

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 1309273 (2024) https://doi.org/10.1117/12.3019749
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

LiteBIRD is a JAXA-led space mission for cosmic microwave background (CMB) polarimetry. One of the challenges in terms of the telescope optics is to characterize and suppress the effects of the far sidelobes in the antenna beam patterns, which contaminate the CMB signals with Galactic foreground radiation. For the Low-Frequency Telescope (LFT; 34 - 161 GHz) aboard LiteBIRD, the requirements include the far-sidelobe knowledge of −56 dB. Because the LFT will operate at 5 K, we investigate the technical feasibility of near-field antenna pattern measurements in a cryogenic chamber. We implement a cryogenic-compatible millimeter-wave circuit and motorized stages inside a chamber and scanned the aperture fields of the LFT, which is fully encased and cryogenically cooled in the chamber. As a pilot experiment in the design phase of the development of the LFT, we have demonstrated such a measurement technique using a 1/4-scaled LFT at 150 K.

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

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Hayato Takakura, Yutaro Sekimoto, Kimihide Odagiri, Rion Takahashi, Fumiya Miura, Frederick Matsuda, and Shugo Oguri "Antenna pattern measurements of a LiteBIRD low-frequency telescope scaled antenna in a cryogenic chamber", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 1309273 (23 August 2024); https://doi.org/10.1117/12.3019749

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