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  本文選題：同軸腔　切入點：圓柱腔　出處：《電子科技大學》2015年碩士論文

【摘要】：諧振腔是一種具有儲能和選頻作用的微波無源器件,廣泛應用于濾波器、振蕩器、頻率計等元器件設計以及微波測量等領域中。然而常用的諧振腔一般采用單一的工作模式,覆蓋頻帶較窄,這樣在寬頻帶測試時必須使用多個腔體,測試工序較為繁瑣且成本較高,因此,用一個腔體覆蓋整個頻帶實現(xiàn)超寬帶測試具有十分重要的意義�；诖搜芯磕康�,本文在分析了常用傳輸線型諧振器的優(yōu)缺點上,分頻段來設計1~40GHz諧振腔腔體,其中1~7GHz采用同軸腔結(jié)構(gòu),7~40GHz采用TE0np模圓柱腔結(jié)構(gòu),最后創(chuàng)新性地將二者整合為一套腔體結(jié)構(gòu),實現(xiàn)用一個腔體覆蓋1~40GHz超寬帶。本文的重點是7~40GHz圓柱腔體的設計。根據(jù)TE0np模諧振頻率公式,給出主腔長度尺寸范圍;繼而利用模式凈化原理及后腔處理技術(shù)建立模型,并利用HFSS軟件對縫隙階梯活塞尺寸進行優(yōu)化,最后分析耦合方式及耦合位置,完成諧振腔的一體化設計。本次論文設計時重點考慮了如下幾個問題:1.干擾模式的抑制:針對工作模式附近數(shù)量繁多的干擾模式,本文采用3步進行抑制,首先利用模式凈化原理對圓柱腔長度進行優(yōu)化,其次利用后腔處理技術(shù)加入縫隙階梯活塞對存在縱向電流分量的干擾模式進行抑制,最后利用雙脊波導/矩形波導激勵對簡并模式進行抑制;2.耦合結(jié)構(gòu)設計:7~40GHz圓柱腔體采用孔耦合激勵,耦合端口選擇在工作模式場強最大值處開孔,且開孔位置需對1~7GHz同軸腔設計造成的影響亦降至最低。最終7~26.5GHz選擇在側(cè)壁處開孔,而Ka波段在上端蓋開孔,而1~7GHz同軸腔采用探針耦合。3.一體化腔體結(jié)構(gòu)的設計:為使同軸腔體0Q值最大,計算可調(diào)節(jié)同軸內(nèi)導體直徑,綜合考慮同軸-圓柱二腔體的相互影響,優(yōu)化設計耦合結(jié)構(gòu),完成同軸腔的設計,實現(xiàn)一體化腔體整體設計。根據(jù)同軸腔及圓柱腔復介電常數(shù)測試原理,搭建可工作于1~40GHz諧振腔測試系統(tǒng),利用微擾法對待測樣品進行了測試,并對測試結(jié)果進行了標準差分析。在整個頻帶內(nèi),測試標準差為??????1%,5tan?12%tan?6 10?????。結(jié)果表明,本文設計合理,滿足預期期望。
[Abstract]:Resonator is a passive microwave device with the function of energy storage and frequency selection. It is widely used in the design of filters, oscillators, cymometers and microwave measurement.However, the common resonators usually use a single mode of operation, which covers a narrow frequency band. In this way, more than one cavity must be used in the wide band test, and the testing procedure is more complicated and the cost is high.It is very important to use one cavity to cover the whole frequency band to realize UWB testing.For this purpose, in this paper, the advantages and disadvantages of the common transmission line resonators are analyzed, and the 1~40GHz resonator is designed in the frequency band, in which the 1~7GHz adopts the coaxial cavity structure of 740 GHz and the TE0np mode cylindrical cavity structure.Finally, the two are innovatively integrated into a set of cavity structure to cover 1~40GHz UWB with one cavity.This paper focuses on the design of 7~40GHz cylindrical cavity.According to the TE0np mode resonant frequency formula, the length range of the main cavity is given, and then the model is established by using the mode purification principle and the post-cavity processing technology, and the size of the gap step piston is optimized by using the HFSS software.Finally, the coupling mode and the coupling position are analyzed, and the integrated design of the resonator is completed.The design of this paper focuses on the following questions: 1.Suppression of interference modes: aiming at a large number of interference modes near working modes, this paper adopts three steps to suppress them. Firstly, the length of cylindrical cavity is optimized by using the principle of mode purification.Secondly, the interference mode with longitudinal current component is suppressed by adding gap step piston in the back cavity processing technique, and the degenerate mode is suppressed by double ridge waveguide / rectangular waveguide excitation.The coupling structure design: 7 ~ 40GHz cylindrical cavity adopts hole coupling excitation, and the coupling port is chosen to open at the maximum working mode field strength, and the influence of the opening position on the design of 1~7GHz coaxial cavity is reduced to the minimum.Finally, 7~26.5GHz was chosen to open at the side wall, while the Ka-band hole was opened in the upper end cover, while the 1~7GHz coaxial cavity was coupled with a probe. 3.The design of the integrated cavity structure: in order to maximize the 0Q value of the coaxial cavity, the diameter of the coaxial inner conductor is calculated, and the interaction between the coaxial cavity and the cylindrical cavity is considered synthetically, the coupling structure is optimized and the design of the coaxial cavity is completed.The whole design of integrated cavity is realized.According to the principle of measuring the complex dielectric constant of coaxial cavity and cylindrical cavity, a measuring system for 1~40GHz resonator is set up. The samples are tested by perturbation method, and the standard deviation of the test results is analyzed.In the whole frequency band, the standard deviation of the test is 5 tan1, 1 2 and 6 10.The results show that the design is reasonable and meets the expected expectations.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN629.1

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本文編號：1715948