消逝模腔可调滤波器研究

发布时间：2018-05-03 03:11

本文选题：消逝模腔 + 品质因数　；参考：《电子科技大学》2017年硕士论文

【摘要】：可调滤波器在电子对抗、微波测量等诸多领域都有着重要用途,然而现有YIG(钇铁石榴石)可调滤波器存在功耗高、不易集成的缺点。同时,近年来先后开发的多种平面可调滤波器都存在宽可调范围与高品质因数不能兼容的问题。所以研制一种易于集成的宽可调范围、高品质因数的可调滤波器具有重要价值。为此,本文以新兴的消逝模腔可调滤波器为研究对象,对影响消逝模腔品质因数与谐振频率调谐范围的因素进行了仿真分析,并对消逝模腔可调滤波器原型器件的加工进行了探索。主要成果和结论如下:1.运用HFSS电磁仿真软件分析了消逝模谐振腔的电磁场结构及其尺寸参数对谐振腔性能的影响。结果显示有助于提高谐振频率的方法包括:减小谐振腔的物理尺寸、在调谐电容极板间增加介质薄膜以及提高介质薄膜的厚度与所用介质材料的介电系数。但这些方法都会对品质因数带来不同程度的恶化。最终选取腔体半径为6.5mm;加载柱高度为3.5mm;加载柱半径为1mm;加载电容极板初始间距为10μm为谐振腔的最终尺寸,在加载电容极板间距由10μm增加到50μm条件下,仿真得到的谐振腔的频率调谐范围为2.46GHz-5.02GHz,品质因数为975-1469。2.使用1中的谐振腔设计了二阶最大平坦型可调滤波器。对可调滤波器的仿真模型进行分析,得到在加载电容极板间距由5μm增大到15μm过程中,滤波器中心频率调谐范围为:1.74GHz-2.85GHz;插入损耗:0.86dB-1.35dB;3dB相对带宽:1.89%-2.07%。3.以仿真模型为基础加工出可调滤波器原型器件,使用矢量网络分析仪对谐振腔与滤波器的加工实物进行测试分析。得到在0-100V调谐电压下,谐振腔的谐振频率调谐为2.49GHz-4.42GHz,谐振腔的无载品质因数为:49-108。而实测的可调滤波器的中心频率在3.05GHz-3.73GHz连续可调;3dB相对带宽为:2.68%-2.75%;插入损耗为:8.42dB-9.87dB。
[Abstract]:Tunable filters have important applications in many fields, such as electronic countermeasures and microwave measurements. However, the existing YIG tunable filters have the disadvantages of high power consumption and difficult integration. At the same time, many planar tunable filters developed in recent years have the problem of wide adjustable range and incompatibility with high quality factor. Therefore, it is of great value to develop a tunable filter with wide adjustable range and high quality factor which is easy to integrate. Therefore, this paper takes the new evanescent cavity tunable filter as the research object, and simulates the factors that affect the tuning range of the quality factor and resonant frequency of the evanescent cavity. The fabrication of the prototype device of evanescent mode cavity tunable filter is also discussed. The main findings and conclusions are as follows: 1. The electromagnetic field structure of the evanescent mode resonator and the influence of its size parameters on the cavity performance are analyzed by using HFSS electromagnetic simulation software. The results show that the methods to improve the resonant frequency include reducing the physical size of the resonator, increasing the dielectric film between the tunable capacitor plates, and increasing the thickness of the dielectric film and the dielectric coefficient of the dielectric material used. However, these methods will bring about varying degrees of deterioration of the quality factor. Finally, the cavity radius is 6.5 mm, the loading column height is 3.5 mm, the loading column radius is 1 mm, and the initial spacing of the loaded capacitor plate is 10 渭 m as the final size of the resonator. When the distance between the loaded capacitor plates is increased from 10 渭 m to 50 渭 m, The frequency tuning range of the resonator is 2.46 GHz to 5.02 GHz and the quality factor is 975-1469.2 GHz. The second order maximum flat tunable filter is designed by using the resonator in 1. By analyzing the simulation model of the tunable filter, it is obtained that the tuning range of the center frequency of the filter is: 1.74 GHz ~ 2.85 GHz, and the insertion loss is: 0.86 dB-1.35 dB relative bandwidth: 1.89 -2.07 .3.When the capacitor plate spacing is increased from 5 渭 m to 15 渭 m, the filter center frequency tuning range is: 1.74 GHz ~ 2.85 GHz, and the insertion loss is: 0.86 dB-1.35 dB relative bandwidth: 1.89 -2.07. 3. Based on the simulation model, the prototype device of tunable filter is fabricated, and the resonator and filter are tested and analyzed by using vector network analyzer. The tuning frequency of the resonator is 2.49GHz-4.42GHz at 0-100V tuning voltage, and the no-load quality factor of the cavity is: 1 / 49-108. The measured center frequency of the tunable filter is 3 dB relative bandwidth of 3 dB continuously adjustable at 3.05GHz-3.73GHz, and the insertion loss is: 1 8.42 dB-9.87 dB.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713

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