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The electrical design of a membrane antenna for a lunar-based low-frequency radio telescope

Astronomical Techniques and Instruments 2024年第4期1卷 227-238页

作者： suonanben Fengquan Wu Kai He Shijie Sun Wei Zhou Minquan Zhou Cong Zhang Jiaqin Xu Qisen Yan Shenzhe Xu Jiacong Zhu Zhao Wang Ke Zhang Haitao Miao Jixia Li Yougang Wang Tianlu Chen Xuelei Chen Key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000China Department of Physics College of ScienceTibet UniversityLhasa 850000China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Key Laboratory of Radio Astronomy and Technology Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Shanxi University Taiyuan 030000China School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China Center for Astronomy and Space Sciences China Three Gorges UniversityYichang 443002China Department of Physics College of SciencesNortheastern UniversityShenyang 110819China Center of High Energy Physics Peking UniversityBeijing 100871China

Detecting primordial fluctuations from the cosmic dark ages requires extremely large low-frequency radio telescope arrays deployed on the far side of the *** antenna of such an array must be lightweight,easily storable and transportable,deployable on a large scale,durable,and capable of good electrical performance.A membrane antenna is an excellent candidate to meet these *** study the design of a low-frequency membrane antenna for a lunar-based low-frequency(<30 MHz)radio telescope constructed from polyimide film widely used in aerospace applications,owing to its excellent dielectric properties and high stability as a substrate *** first design and optimize an antenna in free space through dipole deformation and coupling principles,then simulate an antenna on the lunar surface with a simple lunar soil model,yielding an efficiency greater than 90%in the range of 12-19 MHz and greater than 10%in the range of 5-35 *** antenna inherits the omni-directional radiation pattern of a simple dipole antenna in the 5-30 MHz frequency band,giving a large field of view and allowing detection of the 21 cm global signal when used alone.A demonstration prototype is constructed,and its measured electrical property is found to be consistent with simulated results using|S11|*** membrane antenna can potentially fulfill the requirements of a lunar low-frequency array,establishing a solid technical foundation for future large-scale arrays for exploring the cosmic dark ages.

关键词： Membrane antenna Lunar-based radio array Cosmic dark ages

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