一種星載通信混合反射面天線的設(shè)計(jì)方法
doi: 10.11999/JEIT190564
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中國電子科技集團(tuán)公司第三十九研究所 西安 710065
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陜西省天線與控制技術(shù)重點(diǎn)實(shí)驗(yàn)室 西安 710065
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國防科技大學(xué)氣象海洋學(xué)院 長沙 410073
A Synthesis Method of Hybrid Reflector Antenna for Satellite Communications
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The 39th Institute of China Electronics Technology Group Corporation, Xi’ an 710065, China
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Shanxi Key Laboratory of Antenna and Control Technology, Xi’an 710065, China
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College Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China
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摘要: 為了使星載通信天線產(chǎn)生1個(gè)賦形波束覆蓋服務(wù)區(qū),同時(shí)產(chǎn)生1個(gè)固定點(diǎn)波束和1個(gè)有限掃描點(diǎn)波束,該文提出一種由2個(gè)賦形反射面和3個(gè)饋源組成的混合反射面天線。該天線是以賦形主反射面共用為基礎(chǔ),等效為2副單饋源單偏置反射面天線和1副雙偏置格里高利型賦形反射面天線,分別產(chǎn)生賦形波束、固定點(diǎn)波束和有限掃描點(diǎn)波束。通過對一副口徑為1.2 m的天線各個(gè)波束進(jìn)行仿真實(shí)驗(yàn),賦形波束在Ku收、發(fā)頻段時(shí)波束覆蓋區(qū)邊緣(EoC)方向性系數(shù)為27.5 dBi,固定點(diǎn)波束在C收、發(fā)頻段時(shí)天線口徑效率高于70%,通過將賦形副反射面及對應(yīng)饋源橫向偏焦實(shí)現(xiàn)Ka收、發(fā)頻段的點(diǎn)波束在服務(wù)區(qū)內(nèi)外的掃描。仿真結(jié)果表明,該混合反射面天線可實(shí)現(xiàn)C/Ku/Ka頻段的同時(shí)通信任務(wù)。Abstract: A hybrid reflector antenna is presented to generate a contoured beam over service area, an un-scanned and a scanned pencil beam from two shaped reflectors and three feeds, simultaneously. The shaped main reflector is shared by three beams, and the antenna is equivalent to two single-reflector antennas with single-feed for each beam and a pair of dual offset Gregorian shaped reflector antennas, and generating the contoured, un-scanned and scanned pencil beam, respectively. The proposed method is successfully applied to a 1.2 m hybrid reflector antenna. Simulations and experimentations of each beam has been performed. The Edge of Coverage(EoC) directivity over service area is 27.5 dBi for contoured beam in Tx and Rx working frequency of Ku-band, and the un-scanned pencil beam has a aperture efficiency higher than 70% in Tx and Rx working frequency of C-band. Meanwhile, the scanned pencil beam inside and outside the service area is realized by the lateral defocus of the sub-reflector and the corresponding feed in Tx and Rx working frequency of Ka-band. Simulation results show that the hybrid reflector antenna can realize C/Ku/Ka-band communication tasks simultaneously.
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Key words:
- Hybrid antenna /
- Satellite communications /
- Contoured beam /
- Pencil beam /
- C/Ku/Ka-band
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