【摘要】：根據(jù)毫米波檢測項目,研究了毫米波圓極化天線。根據(jù)項目的具體需求,設計了三款毫米波低剖面圓極化天線：Ka波段波導圓極化天線、W波段波導圓極化天線和Ka波段微帶圓極化天線。工作于Ka波段和W波段的兩款波導圓極化天線在實現(xiàn)圓極化性能的基礎上,較大程度地降低了天線的剖面高度；工作于Ka波段的微帶圓極化天線本身具有極低的剖面高度,實現(xiàn)了較好的圓極化性能且具有較寬的頻帶寬度。首先,開篇介紹了天線基礎知識及其常用電參數(shù),闡述了圓極化波的幾個重要特點,總結了天線實現(xiàn)圓極化的常見方法。其次,設計了一款Ka波段波導圓極化天線。根據(jù)圓波導中TE11模存在的極化簡并現(xiàn)象,在圓波導中增加一對凸臺結構使TE11模的兩個場分量沿兩個正交的方向分離并產(chǎn)生90。的相位差。此設計不僅使天線實現(xiàn)圓極化,更降低了天線的剖面高度,方便于工程中應用。天線實測結果性能良好,與仿真結果吻合。再次,設計了一款W波段波導圓極化天線。在Ka波段波導圓極化天線的基礎上,引入合適長度的匹配結構,有效地減小高次模對工作狀態(tài)的影響,完成了W波段波導圓極化天線的設計。天線實測結果與仿真數(shù)據(jù)一致性較好,天線不僅圓極化性能良好,全頻帶內(nèi)回撥損耗也較小,很好地滿足工程應用需要。最后,研究寬帶微帶圓極化天線,分析了微帶天線實現(xiàn)圓極化輻射和展寬其頻帶寬度的方法,提出了一款工作于Ka波段的寬頻微帶圓極化天線的設計方法,并通過組成陣列的方式使微帶天線實現(xiàn)特殊輻射方向圖一一錐狀方向圖。
[Abstract]:According to the millimeter wave detection project, the millimeter wave circular polarization antenna is studied. According to the specific requirements of the project, three millimeter-wave low profile circular polarization antennas: Ka-band circular polarization antenna, W-band circular polarization antenna and Ka-band microstrip circular polarization antenna are designed. The two waveguide circularly polarized antennas operating in Ka band and W band can greatly reduce the height of the antenna profile on the basis of realizing the circular polarization performance, and the microstrip circular polarization antenna operating in Ka band has extremely low profile height, and the microstrip circular polarization antenna operating in the Ka band has a very low profile height, and the microstrip circular polarization antenna operating in the Ka band has very low profile height. Better circular polarization performance and wider bandwidth are achieved. Firstly, the basic knowledge of antenna and its constant electrical parameters are introduced, several important characteristics of circular polarization wave are expounded, and the common methods of realizing circular polarization are summarized. Secondly, a Ka band waveguide circularly polarized antenna is designed. According to the polarization degeneracy of TE11 modes in circular waveguides, a pair of convex structures are added to the circular waveguides to separate the two field components of the TE11 modes in two orthogonal directions and produce 90. The phase difference of. This design not only makes the antenna realize circular polarization, but also reduces the height of the antenna profile. The measured results are in good agreement with the simulation results. Thirdly, a W band waveguide circularly polarized antenna is designed. Based on the Ka-band waveguide circularly polarized antenna, a matching structure of appropriate length is introduced, which can effectively reduce the influence of high order mode on the working state, and the design of W-band waveguide circularly polarized antenna is completed. The measured results are in good agreement with the simulation data. The antenna not only has a good circular polarization performance, but also has a small callback loss in the whole frequency band, so it can meet the needs of engineering applications. Finally, the broadband microstrip circularly polarized antenna is studied, the method of realizing circular polarization radiation and broadening its bandwidth are analyzed, and a design method of wide-band microstrip circular polarization antenna working in Ka band is proposed. A special radiation pattern, a conical pattern, is realized by forming an array of microstrip antennas.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN821.1

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1 張輝;趙彬;袁乃昌;;基于H形縫隙耦合的寬帶雙極化微帶天線[A];2009年全國天線年會論文集（上）[C];2009年

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