Near-field antenna pattern measurement and holographic phase retrieval of a LiteBIRD high frequency telescope optical model

Emile Carinos; Hayato Takakura; Yutaro Sekimoto; Baptiste Mot; Ludovic Montier; Rion Takahashi; Hiroaki Imada

doi:10.1117/12.3021005

23 August 2024 Near-field antenna pattern measurement and holographic phase retrieval of a LiteBIRD high frequency telescope optical model

Emile Carinos, Hayato Takakura, Yutaro Sekimoto, Baptiste Mot, Ludovic Montier, Rion Takahashi, Hiroaki Imada

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 1309274 (2024) https://doi.org/10.1117/12.3021005
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

B-mode polarization detection in the Cosmic Microwave Background would provide crucial information on the inflationary universe. This is the main goal of the LiteBIRD JAXA-led space mission, to be launched by the beginning of the 2030s. To do so it is necessary to control instrumental systematics such as contamination from the far sidelobes of the telescopes. Following the studies that have been done for LiteBIRD’s Low Frequency Telescope (LFT), we measured near-field antenna patterns of a High Frequency Telescope (HFT) optical prototype to showcase the capabilities for the HFT of near-field antenna pattern measurement as well as holographic phase retrieval. We were able to characterize the far-field antenna pattern up to θ = 60° with a dynamic range of -80 dB. The residuals were estimated to be at most 5 dB at the -80 dB detection level. We detected far sidelobes at θ ≈ 30° with a relative intensity of -50 dB, in line with previous simulations of the HFT. Holographic phase retrieval and other time-frequency analysis of the data show promising results for the characterization of the HFT.

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

Citation Download Citation

Emile Carinos, Hayato Takakura, Yutaro Sekimoto, Baptiste Mot, Ludovic Montier, Rion Takahashi, and Hiroaki Imada "Near-field antenna pattern measurement and holographic phase retrieval of a LiteBIRD high frequency telescope optical model", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 1309274 (23 August 2024); https://doi.org/10.1117/12.3021005

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