本文選題：微帶交叉形諧振器　切入點：等效電路模型　出處：《南京理工大學》2017年碩士論文

【摘要】：微帶交叉形諧振器(Cross-Shaped Resonator,CSR)結構簡單,在各種微帶電路中廣泛使用。但隨著頻率升高,其中心接頭結構將產生寄生電容,影響最終設計結果。論文通過對微帶交叉形諧振器建模,利用導納矩陣推導了參數解析公式,給出了改進方法,并據此研制了用于雷達組網的Ku波段雙工器,完成了雷達組網發(fā)射機研制。具體內容包括:1.建立微帶交叉形諧振器的等效電路模型,提出一種基于導納矩陣的四端口微帶交叉形諧振器高精度超寬帶等效電路參數提取方法,給出其閉式提取式,并對模型進行準確性驗證和參數分析。2.將傳統(tǒng)的微帶交叉形諧振器結構改進為凹-微帶交叉形諧振器結構和凸-微帶交叉形諧振器結構兩種形式,以精確控制微帶交叉形諧振器中心處寄生電容的影響。利用改進后的微帶交叉形諧振器結構研制了兩個中心頻率分別為14 GHz和16.5 GHz的DBR濾波器。最后通過T型節(jié)連接制作出一個符合雷達組網通信系統(tǒng)要求的Ku波段DBR微帶雙工器。實測3 dB相對帶寬分別為7.3%和6.4%,通帶內插入損耗分別小于2.2 dB和2 dB,回波損耗分別好于14 dB和12 dB,阻帶抑制高于50 dB,并具有高達60 dB的隔離度。3.基于現有雷達平臺設計了一種基于2FSK的雷達組網通信系統(tǒng),完成了發(fā)射機的搭建。發(fā)射機上通道用于LFMCW雷達信號發(fā)射,下通道用于目標信息發(fā)射。通信信道利用2FSK調制基帶信號,調制信號上變頻放大后與線性調頻信號一起通過本文研制的DBR雙工器連接到發(fā)射天線。實測雙工器輸出信號滿足指標要求。
[Abstract]:Cross-Shaped Resonator (CSR) has a simple structure and is widely used in various microstrip circuits.However, with the increase of frequency, the parasitic capacitance will be produced in the central junction structure, which will affect the final design results.Based on the modeling of microstrip cross-shaped resonator, the analytical formula of parameters is derived by admittance matrix, and the improved method is given. Based on this, a Ku-band duplex for radar netting is developed, and the radar netting transmitter is developed.The details include: 1.The equivalent circuit model of microstrip crossover resonator is established. A four-port microstrip cross resonator with high precision ultra-wideband equivalent circuit parameter extraction method based on admittance matrix is proposed and its closed extraction formula is given.And the veracity of the model and parameter analysis. 2.The traditional microstrip cross resonator structure is improved into concave-microstrip cross-resonator structure and convex-microstrip cross-resonator structure to accurately control the effect of parasitic capacitance at the center of microstrip cross-shaped resonator.Two DBR filters with central frequencies of 14 GHz and 16. 5 GHz have been developed using the improved microstrip cross resonator structure.Finally, a Ku-band DBR microstrip Duplexer, which meets the requirements of radar netting communication system, is fabricated by T-joint connection.The measured relative bandwidth of 3 dB is 7.3% and 6.4%, the insertion loss in passband is less than 2.2 dB and 2 dB, the echo loss is better than 14 dB and 12 dB, the stopband suppression is more than 50 dB, and the isolation is as high as 60 dB.Based on the existing radar platform, a radar networking communication system based on 2FSK is designed, and the transmitter is built.The upper channel of transmitter is used for LFMCW radar signal transmission, and the lower channel is used for target information transmission.In the communication channel, the baseband signal is modulated by 2FSK. The modulated signal is amplified by up-conversion and connected with the LFM signal via the DBR Duplexer developed in this paper.The measured output signal of duplex meets the requirement of index.
【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】：TN751.2

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本文編號：1724034