Holographic field-retrieval method of near-field measurements of wide field of view millimeter-wave telescopes using reference phase shifting

Rion Takahashi; Hayato Takakura; Yutaro Sekimoto; Fumiya Miura; Junji Inatani; Frederick Matsuda; Shugo Oguri; Shogo Nakamura

doi:10.1117/12.3019672

16 August 2024 Holographic field-retrieval method of near-field measurements of wide field of view millimeter-wave telescopes using reference phase shifting

Rion Takahashi, Hayato Takakura, Yutaro Sekimoto, Fumiya Miura, Junji Inatani, Frederick Matsuda, Shugo Oguri, Shogo Nakamura

Author Affiliations +

Proceedings Volume 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII; 131021R (2024) https://doi.org/10.1117/12.3019672
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Wide-field-of-view millimeter-wave telescopes have been developed for astronomical observations, such as cosmic microwave background (CMB) polarimetry. These telescopes often employee phase-insensitive detectors that are fabricated with the on-chip feed antennas. A holographic field-retrieval method is useful for near-field antenna measurements of such telescopes. Among several variations of the methods, we present the one using the phase shifting of the reference waves, which do not require a fine frequency sweeping. This method aims at application to the ground testing of the LiteBIRD Low-Frequency Telescope (LFT) antenna, which observes the CMB and foreground radiations at 34–161 GHz. In our experiments conducted with a LFT 1/4-scaled antenna, the new method indicated an accuracy of −56 dB levels, which is required for the sidelobe levels of the LFT.

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

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Rion Takahashi, Hayato Takakura, Yutaro Sekimoto, Fumiya Miura, Junji Inatani, Frederick Matsuda, Shugo Oguri, and Shogo Nakamura "Holographic field-retrieval method of near-field measurements of wide field of view millimeter-wave telescopes using reference phase shifting", Proc. SPIE 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 131021R (16 August 2024); https://doi.org/10.1117/12.3019672

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