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  本文選題：順序旋轉　切入點：雙頻　出處：《南京理工大學》2017年碩士論文

【摘要】：圓極化天線對極化位置不敏感,能夠消除電離層對電磁波的法拉第旋轉效應,抗干擾性強,廣泛應用于衛(wèi)星通信、雷達、GPS等系統中。而衛(wèi)星通信系統通常懫用雙頻雙極化共口徑天線。本文對順序旋轉陣列進行深入研究,針對特定衛(wèi)星通信系統研制出X波段高增益雙頻雙圓極化順序旋轉微帶陣列。主要工作如下:第一,綜述了圓極化微帶天線的研究現狀與進展,深入分析了順序旋轉饋電技術及其展寬帶寬的機理,探討了采用不同極化單元時順序旋轉陣列的帶寬和間距優(yōu)化問題。第二,針對特定應用,提出一種單層介質基片結構的雙頻雙圓極化順序旋轉微帶子陣列。利用單個矩形貼片產生極化隔離較高的雙頻雙線極化輻射,再結合2套獨立的饋電網絡組成2×2順序旋轉的雙頻雙圓極化子陣列,實現了兩頻率比僅1.05的X波段雙頻雙圓極化的共口徑天線。線極化模式提供了兩接近頻率之間良好的隔離;順序旋轉饋電實現了良好的圓極化和帶寬特性。第三,為獲取高增益性能,在單層基片上巧妙布置兩套并饋網絡,將2×2子陣擴展到8×8陣列。利用小型化功分和半鋼同軸電纜,進一步將8×8陣列擴展成16×16陣列。研制出的16×16陣列,低頻處和高頻處-15dB阻抗帶寬分別為2.2%和2%,3dB軸比帶寬分別為2.84%和1.57%,最大增益分別為25.1dBi和25.6dBi,兩個中心頻率處的阻抗隔離分別為-18.6dB和-19.4dB。第四,修正并完善了基于線分量法的圓極化天線測試方法。利用兩組正交的線極化幅度信息,無需相位測量,實現對圓極化天線軸比的精確測量,進一步處理出主極化、交叉極化方向圖,給出增益測試方法。本文利用雙模線極化貼片、巧妙的順序旋轉饋電網絡,在單層介質基片上實現了兩個中心頻率比僅1.05的X波段雙頻雙圓極化16×16微帶陣列。陣列增益高、剖面低、圓極化性能優(yōu),帶寬和隔離度良好,加工方便、可靠,具有重要的實用價值。
[Abstract]:Circular polarization antenna is insensitive to polarization position and can eliminate Faraday rotation effect of ionosphere to electromagnetic wave. It has strong anti-jamming and is widely used in satellite communication radar GPS and other systems.Satellite communication systems usually use dual-frequency dual-polarized common aperture antenna.In this paper, the sequential rotation array is studied, and the X-band dual-frequency double-circular polarization sequential rotating microstrip array is developed for the special satellite communication system.The main work is as follows: first, the research status and progress of circularly polarized microstrip antenna are reviewed, and the sequential rotation feed technology and the mechanism of bandwidth broadening are analyzed.The optimization of bandwidth and spacing of sequential rotation arrays with different polarization elements is discussed.Secondly, for specific applications, a double frequency circular polarization sequential rotating microstrip array with single-layer dielectric substrate structure is proposed.A single rectangular patch is used to generate dual-frequency dual-line polarization radiation with high polarization isolation, and two sets of independent feed networks are combined to form a 2 脳 2 sequentially rotated dual-frequency double-circular polaron array.An X band dual frequency dual circular polarization antenna with two frequency ratio of 1.05 is realized.The linear polarization mode provides a good isolation between the two proximity frequencies, and the sequential rotation feed achieves good circular polarization and bandwidth characteristics.Thirdly, in order to obtain high gain performance, two sets of parallel feed networks are arranged on the single-layer substrate, and the 2 脳 2 subarray is extended to 8 脳 8 array.Using miniaturized power distribution and semi-steel coaxial cable, the 8 脳 8 array is further expanded to 16 脳 16 array.For the 16 脳 16 array, the impedance bandwidth of -15dB at low and high frequencies is 2.2% and 2.84% and 1.57, respectively, and the maximum gain is 25.1dBi and 25.6 dBi.The impedance isolation at two central frequencies is -18.6dB and -19.4 dB, respectively.Fourthly, the testing method of circular polarization antenna based on linear component method is modified and improved.Using two sets of orthogonal linear polarization amplitude information and no phase measurement, the axial ratio of circular polarization antenna can be accurately measured. Furthermore, the main polarization and cross polarization patterns are processed, and the gain measurement method is given.In this paper, two X-band dual-frequency double-circularly polarized 16 脳 16 microstrip arrays with a central frequency ratio of only 1.05 have been realized on a single-layer dielectric substrate by using a double-mode linear polarization patch and a cleverly sequentially rotating feed network.The array has high gain, low profile, good circular polarization performance, good bandwidth and isolation, convenient and reliable processing, and has important practical value.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN822

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