發(fā)布時間：2018-10-13 17:54

【摘要】：目前毫米波在新型通信、雷達(dá)、無線電天文學(xué)和遙感系統(tǒng)中得到迅速發(fā)展,毫米波天線的研究因此受到廣泛關(guān)注。反射面天線具有高增益、低副瓣、結(jié)構(gòu)簡單、設(shè)計靈活等優(yōu)點,是常用的毫米波天線形式。特定的雷達(dá)系統(tǒng)和衛(wèi)星通信應(yīng)用中,要求實現(xiàn)高增益窄波束夾角的毫米波多波束天線和具有全向輻射特性的錐狀波束天線,這可以通過靈活的反射面賦形來實現(xiàn)。本文即展開毫米波賦形雙反射面天線的研究。首先本文對基于表面電流積分的物理光學(xué)(PO)法進(jìn)行研究,編制了基于PO法計算拋物面天線的歸一化方向圖的Matlab程序。接著利用上述Matlab程序研究了天線口徑場分布對波束寬度的影響。在此基礎(chǔ)上針對某毫米波探測系統(tǒng)應(yīng)用,設(shè)計了高增益窄波束夾角的毫米波雙波束雙反射面天線。使用小口徑的介質(zhì)棒饋源代替喇叭饋源,實現(xiàn)口徑面上的錐削幅度分布。設(shè)計的78GHz雙波束天線,增益為38dB,雙波束夾角為2°,在-3dB處交疊,口徑效率51.9%,能很好滿足探測要求。最后針對用于一點對多點覆蓋范圍的地面衛(wèi)星通信的錐狀波束反射面天線進(jìn)行研究。對雙反射面天線進(jìn)行賦形研究,使得在指定方向上的天線口徑上獲得均勻相位分布,實現(xiàn)該方向上的錐狀波束。本文設(shè)計出工作于35GHz、30°和60°錐角上的賦形雙反射面錐狀波束天線。錐角為30°的天線增益為13.4dB,副瓣為-14.3dB；錐角為60°的天線增益為11.7dB,副瓣為-15.0dB。方位面內(nèi)的方向圖具有很好的圓對稱性。
[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 擄. 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 擄conical angles is designed. The gain of the antenna with 30 擄cone angle is 13.4dB and the sidelobe is -14.3 dB, and the gain of the antenna with 60 擄cone angle is 11.7dBand the sidelobe is -15.0dB. The pattern in the azimuth plane has good circular symmetry.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN823.27

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本文編號：2269443