Ka波段双平面反射阵列天线设计

发布时间：2018-06-18 23:23

本文选题：毫米波天线 + 双平面反射阵列　；参考：《南京理工大学》2014年硕士论文

【摘要】：随着毫米波在新型通信、雷达、无线电天文学和遥感系统中的迅速发展和广泛应用,毫米波高增益定向天线受到越来越多的关注。然而无论以抛物面天线为代表的单反射天线还是以卡塞格伦天线为代表的双反射面天线,均存在曲面结构造成了体积大、制作难度高、不易共形等缺点。为了克服这样的弱点,研究反射面天线的平面化就成为了一个热点。在毫米波波段,最为可行的选择就是通过调节单元反射相位来进行空间相位补偿的平面反射阵列天线。其中阵列单元的布局和相移特性是平面化设计的核心。Fresnel区这种离散化等相位环的相位布局设计具有设计简便,对馈源偏移不敏感等优点。折叠式双平面反射器相对于其他反射阵列天线,由于加入半反射栅板而具有剖面高度低,机械稳定性好的优点,并且摆脱了馈源、副面、支架的遮挡。本文对反射面天线平面化进行研究,结合了Fresnel区相位分布与折叠式双平面反射器,利用一种新型的C型反射单元进行相位补偿和极化扭转；利用半反射栅条板实现聚焦功能。在此基础上进一步探讨焦径比对天线整体性能的影响。通过对35GHz双平面反射阵列天线优化仿真,得到最优的焦径比下的反射系数为-12.45dB,增益为24.9dB,并加工了口径66mm的样品,测得中心频点反射系数-11.5dB,增益23.5dB。
[Abstract]:With the rapid development and wide application of millimeter wave in new communication, radar, radio astronomy and remote sensing systems, more and more attention has been paid to millimeter wave high gain directional antenna. However, both the single reflector antenna represented by paraboloid antenna and the double reflector antenna represented by Cassegrain antenna have many disadvantages, such as large volume, high fabrication difficulty and difficult conformal structure. In order to overcome this weakness, the research on the planarization of reflector antenna has become a hot spot. In millimeter-wave band, the most feasible choice is to adjust the reflection phase of the unit to compensate the spatial phase of the planar reflector array antenna. The layout and phase shift characteristics of array elements are the core of the planarization design. The phase layout of the discrete equal-phase loop in the Fresnel region has the advantages of simple design and insensitivity to the feed offset. Compared with other reflector array antennas, the foldable double-plane reflector has the advantages of low profile height and good mechanical stability due to the addition of semi-reflective grid plate, and gets rid of the shielding of feed, auxiliary surface and bracket. In this paper, the planarization of reflector antenna is studied. The phase distribution in Fresnel region and the folding biplane reflector are combined, a new type of C-type reflector is used for phase compensation and polarization torsion, and the semi-reflective grid strip is used to realize the focusing function. On this basis, the effect of focal diameter ratio on the overall performance of the antenna is further discussed. Through the optimization simulation of 35GHz dual plane reflector array antenna, the optimum focal diameter ratio is -12.45 dB and the gain is 24.9 dB. The sample of aperture 66mm is processed. The center frequency reflection coefficient of -11.5dB and the gain of 23.5 dB are obtained.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN823.27

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