Journal
IEEE ACCESS
Volume 10, Issue -, Pages 61451-61462Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2022.3182108
Keywords
Circularly polarized antenna; CubeSat antenna; hybrid coupler; Internet of Space Things; S-band antenna; sequentially rotated antenna; solar cell integrated antenna
Categories
Funding
- National Research Foundation of Korea (NRF) Grant through the Korea Government [Ministry of Science and ICT (MSIT)] [NRF-2022R1F1A1065324, 2021R1A4A1030775]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2020R1A2B5B01002251]
- National Research Foundation of Korea [2020R1A2B5B01002251] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The paper introduces a low-profile wideband circularly polarized (CP) antenna using solar cell patches for CubeSat applications. The antenna has a compact size and efficient energy harvesting, making it suitable for autonomous communication systems in the Internet of Space Things (IoST).
This paper proposes a low-profile wideband circularly polarized (CP) antenna using solar cell patches as radiation elements and a sequentially rotated feeding network for CubeSat applications. To realize a wide axial ratio (AR) bandwidth with a compact size, a sequentially rotated feeding network was designed by modifying a quadrature hybrid coupler and a rat-race coupler that has a small change in phase difference even when the frequency changes. A wideband CP patch array antenna was designed by combining a C-shaped slot-coupled solar cell patch in conjunction with a novel feeding network. The overall size of the proposed CP CubeSat antenna is 100 x 100 x 7.2 mm(3) (0.83 lambda(o) x 0.83 lambda(o) x 0.06 lambda(o) at 2.5 GHz). Solar cells occupy 79% of the antenna area, enabling efficient energy harvesting. The -10 dB impedance bandwidth is 1.98-3.0 GHz, which is a fractional bandwidth of approximately 41.0%. The 3-dB AR and 3-dB gain bandwidths are 1.98-3.0 GHz (41.0%) and 1.82-2.98 GHz (46.6%), respectively. The proposed CP solar patch array antenna demonstrates a constant radiation pattern within the -10 dB impedance bandwidth. The proposed CubeSat antenna is suitable for use in an Internet of Space Things (IoST) autonomous communication system.
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