毫米波赋形双反射面天线设计
发布时间：2018-10-13 17:54
【摘要】：目前毫米波在新型通信、雷达、无线电天文学和遥感系统中得到迅速发展,毫米波天线的研究因此受到广泛关注。反射面天线具有高增益、低副瓣、结构简单、设计灵活等优点,是常用的毫米波天线形式。特定的雷达系统和卫星通信应用中,要求实现高增益窄波束夹角的毫米波多波束天线和具有全向辐射特性的锥状波束天线,这可以通过灵活的反射面赋形来实现。本文即展开毫米波赋形双反射面天线的研究。首先本文对基于表面电流积分的物理光学(PO)法进行研究,编制了基于PO法计算抛物面天线的归一化方向图的Matlab程序。接着利用上述Matlab程序研究了天线口径场分布对波束宽度的影响。在此基础上针对某毫米波探测系统应用,设计了高增益窄波束夹角的毫米波双波束双反射面天线。使用小口径的介质棒馈源代替喇叭馈源,实现口径面上的锥削幅度分布。设计的78GHz双波束天线,增益为38dB,双波束夹角为2°,在-3dB处交叠,口径效率51.9%,能很好满足探测要求。最后针对用于一点对多点覆盖范围的地面卫星通信的锥状波束反射面天线进行研究。对双反射面天线进行赋形研究,使得在指定方向上的天线口径上获得均匀相位分布,实现该方向上的锥状波束。本文设计出工作于35GHz、30°和60°锥角上的赋形双反射面锥状波束天线。锥角为30°的天线增益为13.4dB,副瓣为-14.3dB；锥角为60°的天线增益为11.7dB,副瓣为-15.0dB。方位面内的方向图具有很好的圆对称性。
[Abstract]:At present, millimeter-wave (MMW) has been developed rapidly in new communication, radar, radio astronomy and remote sensing systems, so the research of millimeter-wave antenna has been paid more and more attention. Reflector antenna has the advantages of high gain, low sidelobe, simple structure and flexible design. In particular radar systems and satellite communication applications, millimeter-wave multi-beam antennas with high gain and narrow beam angle and conical beam antennas with omnidirectional radiation characteristics are required, which can be realized by flexible reflector shaping. In this paper, the study of millimeter wave shaped double reflector antenna is carried out. Firstly, the physical optics (PO) method based on the surface current integration is studied in this paper, and a Matlab program for calculating the normalized pattern of paraboloid antenna based on PO method is developed. Then the influence of antenna aperture field distribution on beam width is studied by using the above Matlab program. Based on this, a millimeter-wave dual-beam dual-reflector antenna with high gain and narrow beam angle is designed for a millimeter wave detection system. The medium rod feed with small caliber is used instead of the horn feed to realize the coning amplitude distribution on the aperture surface. The 78GHz dual-beam antenna has a gain of 38 dB and an angle of 2 掳. It overlaps at-3dB and has a aperture efficiency of 51.9. The antenna can meet the detection requirements well. Finally, a cone-beam reflector antenna for ground satellite communication with one point to multi point coverage is studied. In this paper, the shape of dual reflector antenna is studied to obtain the uniform phase distribution on the aperture of the antenna in the specified direction, and to realize the conical beam in that direction. In this paper, a beam-shaped double reflector conical beam antenna working at 35 GHz and 60 掳conical angles is designed. The gain of the antenna with 30 掳cone angle is 13.4dB and the sidelobe is -14.3 dB, and the gain of the antenna with 60 掳cone angle is 11.7dBand the sidelobe is -15.0dB. The pattern in the azimuth plane has good circular symmetry.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN823.27
本文编号：2269443
[Abstract]:At present, millimeter-wave (MMW) has been developed rapidly in new communication, radar, radio astronomy and remote sensing systems, so the research of millimeter-wave antenna has been paid more and more attention. Reflector antenna has the advantages of high gain, low sidelobe, simple structure and flexible design. In particular radar systems and satellite communication applications, millimeter-wave multi-beam antennas with high gain and narrow beam angle and conical beam antennas with omnidirectional radiation characteristics are required, which can be realized by flexible reflector shaping. In this paper, the study of millimeter wave shaped double reflector antenna is carried out. Firstly, the physical optics (PO) method based on the surface current integration is studied in this paper, and a Matlab program for calculating the normalized pattern of paraboloid antenna based on PO method is developed. Then the influence of antenna aperture field distribution on beam width is studied by using the above Matlab program. Based on this, a millimeter-wave dual-beam dual-reflector antenna with high gain and narrow beam angle is designed for a millimeter wave detection system. The medium rod feed with small caliber is used instead of the horn feed to realize the coning amplitude distribution on the aperture surface. The 78GHz dual-beam antenna has a gain of 38 dB and an angle of 2 掳. It overlaps at-3dB and has a aperture efficiency of 51.9. The antenna can meet the detection requirements well. Finally, a cone-beam reflector antenna for ground satellite communication with one point to multi point coverage is studied. In this paper, the shape of dual reflector antenna is studied to obtain the uniform phase distribution on the aperture of the antenna in the specified direction, and to realize the conical beam in that direction. In this paper, a beam-shaped double reflector conical beam antenna working at 35 GHz and 60 掳conical angles is designed. The gain of the antenna with 30 掳cone angle is 13.4dB and the sidelobe is -14.3 dB, and the gain of the antenna with 60 掳cone angle is 11.7dBand the sidelobe is -15.0dB. The pattern in the azimuth plane has good circular symmetry.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN823.27
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，本文编号：2269443
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