超宽带谐振腔设计技术研究及应用

发布时间：2018-04-05 18:30

  本文选题：同轴腔　切入点：圆柱腔　出处：《电子科技大学》2015年硕士论文

【摘要】：谐振腔是一种具有储能和选频作用的微波无源器件,广泛应用于滤波器、振荡器、频率计等元器件设计以及微波测量等领域中。然而常用的谐振腔一般采用单一的工作模式,覆盖频带较窄,这样在宽频带测试时必须使用多个腔体,测试工序较为繁琐且成本较高,因此,用一个腔体覆盖整个频带实现超宽带测试具有十分重要的意义。基于此研究目的,本文在分析了常用传输线型谐振器的优缺点上,分频段来设计1~40GHz谐振腔腔体,其中1~7GHz采用同轴腔结构,7~40GHz采用TE0np模圆柱腔结构,最后创新性地将二者整合为一套腔体结构,实现用一个腔体覆盖1~40GHz超宽带。本文的重点是7~40GHz圆柱腔体的设计。根据TE0np模谐振频率公式,给出主腔长度尺寸范围;继而利用模式净化原理及后腔处理技术建立模型,并利用HFSS软件对缝隙阶梯活塞尺寸进行优化,最后分析耦合方式及耦合位置,完成谐振腔的一体化设计。本次论文设计时重点考虑了如下几个问题:1.干扰模式的抑制:针对工作模式附近数量繁多的干扰模式,本文采用3步进行抑制,首先利用模式净化原理对圆柱腔长度进行优化,其次利用后腔处理技术加入缝隙阶梯活塞对存在纵向电流分量的干扰模式进行抑制,最后利用双脊波导/矩形波导激励对简并模式进行抑制;2.耦合结构设计:7~40GHz圆柱腔体采用孔耦合激励,耦合端口选择在工作模式场强最大值处开孔,且开孔位置需对1~7GHz同轴腔设计造成的影响亦降至最低。最终7~26.5GHz选择在侧壁处开孔,而Ka波段在上端盖开孔,而1~7GHz同轴腔采用探针耦合。3.一体化腔体结构的设计:为使同轴腔体0Q值最大,计算可调节同轴内导体直径,综合考虑同轴-圆柱二腔体的相互影响,优化设计耦合结构,完成同轴腔的设计,实现一体化腔体整体设计。根据同轴腔及圆柱腔复介电常数测试原理,搭建可工作于1~40GHz谐振腔测试系统,利用微扰法对待测样品进行了测试,并对测试结果进行了标准差分析。在整个频带内,测试标准差为??????1%,5tan?12%tan?6 10?????。结果表明,本文设计合理,满足预期期望。
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN629.1

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