發(fā)布時(shí)間：2018-06-18 23:23

  本文選題：毫米波天線 + 雙平面反射陣列　； 參考：《南京理工大學(xué)》2014年碩士論文

【摘要】：隨著毫米波在新型通信、雷達(dá)、無(wú)線電天文學(xué)和遙感系統(tǒng)中的迅速發(fā)展和廣泛應(yīng)用,毫米波高增益定向天線受到越來越多的關(guān)注。然而無(wú)論以拋物面天線為代表的單反射天線還是以卡塞格倫天線為代表的雙反射面天線,均存在曲面結(jié)構(gòu)造成了體積大、制作難度高、不易共形等缺點(diǎn)。為了克服這樣的弱點(diǎn),研究反射面天線的平面化就成為了一個(gè)熱點(diǎn)。在毫米波波段,最為可行的選擇就是通過調(diào)節(jié)單元反射相位來進(jìn)行空間相位補(bǔ)償?shù)钠矫娣瓷潢嚵刑炀�。其中陣列單元的布局和相移特性是平面化設(shè)計(jì)的核心。Fresnel區(qū)這種離散化等相位環(huán)的相位布局設(shè)計(jì)具有設(shè)計(jì)簡(jiǎn)便,對(duì)饋源偏移不敏感等優(yōu)點(diǎn)。折疊式雙平面反射器相對(duì)于其他反射陣列天線,由于加入半反射柵板而具有剖面高度低,機(jī)械穩(wěn)定性好的優(yōu)點(diǎn),并且擺脫了饋源、副面、支架的遮擋。 本文對(duì)反射面天線平面化進(jìn)行研究,結(jié)合了Fresnel區(qū)相位分布與折疊式雙平面反射器,利用一種新型的C型反射單元進(jìn)行相位補(bǔ)償和極化扭轉(zhuǎn)；利用半反射柵條板實(shí)現(xiàn)聚焦功能。在此基礎(chǔ)上進(jìn)一步探討焦徑比對(duì)天線整體性能的影響。通過對(duì)35GHz雙平面反射陣列天線優(yōu)化仿真,得到最優(yōu)的焦徑比下的反射系數(shù)為-12.45dB,增益為24.9dB,并加工了口徑66mm的樣品,測(cè)得中心頻點(diǎn)反射系數(shù)-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.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN823.27

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本文編號(hào)：2037238