本文關(guān)鍵詞： 船舶導(dǎo)航雷達(dá) 波導(dǎo)縫隙陣列天線 饋電系統(tǒng) 天線伺服系統(tǒng) 零折射率材料　出處：《南京信息工程大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：船舶導(dǎo)航雷達(dá)是海上船只的必備裝備,用以觀測周邊的岸線、橋梁以及浮標(biāo)等。天線系統(tǒng)作為雷達(dá)系統(tǒng)的主要組成部分之一,其指標(biāo)直接影響整個(gè)雷達(dá)的工作性能。目前,許多中型船舶導(dǎo)航雷達(dá)使用一種采用波導(dǎo)管單端饋電、終端接負(fù)載的行波天線。該結(jié)構(gòu)天線不僅饋電較為繁瑣,傳輸損耗相對較大,而且由于結(jié)構(gòu)的非對稱性破壞了天線的平衡,給伺服系統(tǒng)的抗風(fēng)性設(shè)計(jì)帶來了難度。 本文從性能指標(biāo)、設(shè)計(jì)周期以及加工難易等多個(gè)角度研究分析了新型船用天線的設(shè)計(jì)。本設(shè)計(jì)中采用中間同軸饋電的方式,不僅僅降低了伺服系統(tǒng)的設(shè)計(jì)難度也減小了饋電傳輸損耗。同時(shí),文中以駐波天線代替行波天線,避免了終端負(fù)載帶來的電磁能量損耗。在天線的陣列設(shè)計(jì)上,本文使用了一種添加陣列劃分板的近似設(shè)計(jì)方法,使得陣列天線設(shè)計(jì)周期較短,同時(shí)實(shí)驗(yàn)證明了該方法的可行性。實(shí)驗(yàn)結(jié)果表明,該天線增益可達(dá)28.3dB,第一旁瓣電平低于-20.5dB,水平波束寬度為2.1°。 另外,本文對零折射率材料作了簡要的研究分析,試圖將零折射率材料用于船用天線。仿真結(jié)果表明,在不增大天線口徑面的情況下零折射率材料可以提高船舶導(dǎo)航雷達(dá)天線的增益。
[Abstract]:Ship navigation radar is an essential equipment for ships at sea to observe the surrounding shore lines, bridges and buoys. As one of the main components of radar system, the antenna system has a direct impact on the performance of the whole radar. Many medium-size ship navigation radars use a traveling wave antenna with a single end feed of waveguide tube and a terminal load. The structure antenna is not only complicated in feeding, but also has a relatively large transmission loss. Because the asymmetry of the structure destroys the balance of the antenna, it is difficult to design the wind resistance of the servo system. In this paper, the design of a new type of marine antenna is studied and analyzed from the aspects of performance index, design cycle and difficulty in machining, etc. In this design, the mode of intermediate coaxial feeding is used in the design. It not only reduces the design difficulty of servo system, but also reduces the transmission loss. At the same time, standing wave antenna is used instead of traveling wave antenna to avoid the electromagnetic energy loss caused by terminal load. In this paper, an approximate design method of adding array partition board is used, which makes the design period of array antenna shorter, and the feasibility of the method is proved by experiments. The experimental results show that, The gain of the antenna can reach 28.3 dB, the level of the first side lobe is lower than -20.5 dB, and the horizontal beam width is 2.1 擄. In addition, the zero refractive index material is analyzed briefly, and the zero refractive index material is tried to be used in marine antenna. The simulation results show that, The gain of ship navigation radar antenna can be improved by zero refractive index material without increasing antenna aperture.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U665.22

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