A 1–50 MHz short dipole antenna for observing the 21 cm global signal on the Moon

Yasumasa Yamasaki; Takeru Matsumoto; Satoru Iguchi; Toshikazu Onishi; Toru Yamada; Daisuke Yamauchi; Fuminori Tsuchiya; Keitaro Takahashi; Naoki Isobe; Takahiro Iwata; Naoto Usami; Yutaro Sekimoto; Yasuyuki Miyazaki; Takanao Saiki; Osamu Mori; Tetsuo Yoshimitsu

doi:10.1117/12.3018545

23 August 2024 A 1–50 MHz short dipole antenna for observing the 21 cm global signal on the Moon

Yasumasa Yamasaki, Takeru Matsumoto, Satoru Iguchi, Toshikazu Onishi, Toru Yamada, Daisuke Yamauchi, Fuminori Tsuchiya, Keitaro Takahashi, Naoki Isobe, Takahiro Iwata, Naoto Usami, Yutaro Sekimoto, Yasuyuki Miyazaki, Takanao Saiki, Osamu Mori, Tetsuo Yoshimitsu

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 1309278 (2024) https://doi.org/10.1117/12.3018545
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We have planned the Lunar observatory project, TSUKUYOMI aiming to meter-wavelength observations on the Moon. One of the scientific objectives is to observe the 21 cm global signal from the Dark Ages using the 1–50 MHz observing frequency range. The receiving system must have a noise temperature sufficiently lower than the foreground noise and also requires the flat bandpass response. To cover the ultra-wide bandwidth, an electrically-short dipole antenna and a preamplifier with high input impedance will be employed. This paper focuses on a feasibility study of the system performance. The environment of and around the observation site, such as the lunar surface dielectric constant and the antenna height from the ground plane, affects the sensitivity because it alters important parameters such as the antenna beam pattern and impedance. The investigation results of relationship between the surrounding environment and the sensitivity will be also reported.

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

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Yasumasa Yamasaki, Takeru Matsumoto, Satoru Iguchi, Toshikazu Onishi, Toru Yamada, Daisuke Yamauchi, Fuminori Tsuchiya, Keitaro Takahashi, Naoki Isobe, Takahiro Iwata, Naoto Usami, Yutaro Sekimoto, Yasuyuki Miyazaki, Takanao Saiki, Osamu Mori, and Tetsuo Yoshimitsu "A 1–50 MHz short dipole antenna for observing the 21 cm global signal on the Moon", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 1309278 (23 August 2024); https://doi.org/10.1117/12.3018545

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