本文選題：頻掃天線 + 復合左右手材料��； 參考：《南京理工大學》2017年碩士論文

【摘要】：頻率掃描天線因為其結構簡單、重量輕和成本低等優(yōu)勢而被廣泛地應用到多方面領域。但普通頻掃天線陣也有頻掃時主波束掃描角度小、測角精度不夠等缺點。針對上述問題,本文從寬角度掃描、單脈沖實現(xiàn)方面分別對頻率掃描天線進行了研究。首先,以實現(xiàn)大角度頻率掃描為目的,研究了將復合左右手(CRLH)傳輸線結構應用于基片集成波導的頻掃漏波天線。根據CRLH傳輸線理論,結合電磁仿真軟件CST仿真分析,實現(xiàn)了在Ku波段3GHz的帶寬內掃描50.7度的寬角度頻掃。并在此基礎上研究了采用稀布CRLH漏波天線陣列的方法降低其副瓣。其次,設計了一款應用于相頻掃雷達中的波導縫隙陣列天線。根據等效電路法分析了窄邊波導縫隙天線的設計原理,闡明了設計步驟,仿真設計出了一款波導縫隙陣列天線。然后對雷達前端進行了校準,并測試了天線陣面的兩維方向圖,工作頻帶內,頻掃維實測副瓣在-25dB以下,相掃維實測副瓣在-20dB以下。最后,針對相頻掃雷達中頻率掃描波束對目標的定位、跟蹤精度問題,研究了實現(xiàn)波導頻掃單脈沖的天線結構。采用了以Taylor分布與Bayliss分布的幅度和、差分別作為相鄰兩根波導分布的形式,由和差網絡的同相饋電和反相饋電來同時得到和、差波束。設計出的波導頻掃單脈沖天線,中心頻點的和波束副瓣為-28.4dB,對應的差波束的零深(與和波束相比)為-32.5dB,驗證了這種方式的可行性。
[Abstract]:Frequency scanning antenna is widely used in many fields because of its simple structure, light weight and low cost. But the common frequency-sweep antenna array also has the shortcomings of small scanning angle of main beam and low precision of angle measurement. Aiming at the above problems, this paper studies the frequency scanning antenna from the aspect of wide angle scanning and monopulse realization. Firstly, in order to realize the large angle frequency scanning, the frequency sweep leaky wave antenna based on the composite left-right hand (CRLH) transmission line structure is studied. According to the theory of CRLH transmission line and the simulation analysis of electromagnetic simulation software CST, a wide angle sweep of 50.7 degree in the Ku-band 3GHz bandwidth is realized. On this basis, the method of reducing sidelobe by using thin-distributed CRLH leaky wave antenna array is studied. Secondly, a waveguide slot array antenna used in phase sweep radar is designed. According to the equivalent circuit method, the design principle of narrow side waveguide slot antenna is analyzed, the design steps are explained, and a waveguide slot array antenna is simulated and designed. Then the radar front end is calibrated, and the two dimensional pattern of antenna array is tested. In the frequency band, the measured sidelobe of frequency sweep dimension is below -25 dB, and the measured sidelobe of phase sweep dimension is below -20 dB. Finally, the antenna structure of waveguide frequency sweep monopulse is studied for the target location and tracking accuracy of frequency scanning beam in phase sweep radar. Using the amplitude sum and difference of Taylor distribution and Bayliss distribution as the forms of adjacent two waveguide distributions, the sum and differential beams are obtained simultaneously from the in-phase and inverse feed of the sum-difference network. The designed waveguide frequency-sweep monopulse antenna has a sidelobe of -28.4dB and a zero depth of -32.5dB (compared with the beam) at the center frequency. The feasibility of this method is verified.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN827.3

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