【摘要】：鐵氧體環(huán)行器作為一種重要的非互易微波器件,由于其正向傳輸、反向隔離的特性,常被應(yīng)用于雷達(dá)系統(tǒng)中,能夠解決發(fā)射接收共用同一副天線的問題。在航空、航天、航海、電子、通訊、醫(yī)療等領(lǐng)域,環(huán)行器已經(jīng)得到了廣泛應(yīng)用。結(jié)合實際需求,本文選擇X波段波導(dǎo)結(jié)環(huán)行器為研究對象。首先提出了波導(dǎo)結(jié)環(huán)行器的設(shè)計指標(biāo),并對波導(dǎo)結(jié)環(huán)行器的相關(guān)理論從鐵氧體材料、網(wǎng)絡(luò)分析、場分析、以及等效電路方面進(jìn)行了介紹,為后續(xù)的設(shè)計與分析提供了重要的理論依據(jù)。在此基礎(chǔ)上先是利用圓盤形阻抗變換器設(shè)計波導(dǎo)結(jié)環(huán)行器,隨后將環(huán)行器設(shè)計成部分高度雙三角形鐵氧體中心結(jié)形式,并采用三角形金屬板阻抗變換器來實現(xiàn)環(huán)行器的阻抗匹配,解決了帶寬不足缺點。為使結(jié)構(gòu)緊湊,并對加工誤差可調(diào)節(jié),引入了 T-Y結(jié)構(gòu)和三螺釘匹配器。對選擇的設(shè)計方案及計算模型應(yīng)用HFSS軟件進(jìn)行仿真優(yōu)化,分析并確定了環(huán)行器的基本器件尺寸。波導(dǎo)結(jié)環(huán)行器的機械設(shè)計中,引入了裝配臺階,并將腔殼、匹配塊與裝配臺階設(shè)置為一體化加工而成的結(jié)構(gòu),降低了加工難度,提高了裝配效率。同時將磁場孔內(nèi)陷于匹配塊中,有效減小了環(huán)行器的體積。然后使用SolidWorks軟件進(jìn)行波導(dǎo)結(jié)環(huán)行器加工圖的繪制,最后加工出實物并完成了測試。測試結(jié)果表明,本文所設(shè)計的X波段波導(dǎo)結(jié)環(huán)行器性能優(yōu)良,在9.1GHz～10.5GHz頻段內(nèi),各項指標(biāo)滿足系統(tǒng)要求(插入損耗0.3dB,隔離度20dB,VSWR1.25)。
[Abstract]:As an important non-reciprocal microwave device, ferrite circulator is often used in radar system because of its forward transmission and reverse isolation, which can solve the problem of transmitting and receiving the same antenna. Circulators have been widely used in aviation, aerospace, navigation, electronics, communications, medical and other fields. According to the actual demand, X-band waveguide junction circulator is chosen as the research object in this paper. First, the design index of waveguide junction circulator is put forward, and the related theory of waveguide junction circulator is introduced from the aspects of ferrite material, network analysis, field analysis and equivalent circuit. It provides an important theoretical basis for subsequent design and analysis. First, a waveguide junction circulator is designed by using a disk impedance converter, and then the circulator is designed as a partially high double triangle ferrite central junction. Triangle metal plate impedance converter is used to realize impedance matching of circulator, which solves the shortage of bandwidth. In order to make the structure compact and the machining error adjustable, T-Y structure and three screw matcher are introduced. The selected design scheme and calculation model are simulated and optimized by HFSS software, and the basic device size of the circulator is analyzed and determined. In the mechanical design of waveguide junction circulator, the assembly step is introduced, and the cavity shell, matching block and assembly step are set up as the structure of integrated machining, which reduces the processing difficulty and improves the assembly efficiency. At the same time, the volume of the circulator is reduced effectively by placing the magnetic hole in the matching block. Then the SolidWorks software is used to draw the machining diagram of the waveguide junction circulator. Finally, the material object is machined and the test is completed. The test results show that the designed X-band waveguide junction circulator has good performance. In the 9.1GHz~10.5GHz band, the parameters meet the system requirements (insertion loss 0.3 dB, isolation 20 dB VSW1.25).
【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】：2017
【分類號】：TN621

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本文編號：2405650