一种基片集成波导带通滤波器的设计与实现

发布时间：2018-06-12 18:29

本文选题：基片集成波导 + 带通滤波器　；参考：《电子科技大学》2015年硕士论文

【摘要】：为了更好地利用频谱资源和应对复杂的电磁环境,对作为频率选择、信号隔离关键器件的滤波器提出了更高的性能指标要求。同时,移动设备应用的普及也推动着滤波器小型化的发展。基片集成波导是一种新型平面电路传输线结构,是利用常见的平面电路加工技术,通过合理排布金属化过孔与其他一些结构来实现一种近似传统波导传输特性的电路结构。基片集成波导兼具了传统波导结构与平面电路结构的一些优点,同时又有其独特的结构特点。本文基片集成波导带通滤波器的设计是通过类比传统矩形波导结构来进行的。由于基片集成波导的结构特点,造成了其在电磁波传播特性上与传统矩形波导的相似性。利用这种等效关系,借鉴成熟的波导滤波器的设计方法,根据项目的指标要求,在K波段和X波段快速有效的完成了基片集成波导带通滤波器的设计。首先,对基片集成波导结构特点与传播特性进行了研究,并对基片集成波导与传统金属波导的关系进行了分析。设计了K波段E面金属膜片波导滤波器,分析并总结了一套波导滤波器的设计思路与方法。然后,在基片集成波导结构上利用感性金属通孔滤波器结构,类比E面金属膜片波导滤波器,在K波段和X波段完成了基片集成波导带通滤波器的设计。最后,提出了一种改善基片集成波导滤波器带外抑制效果的方法。利用缺陷地面结构的带阻频率响应特性,通过在基片集成波导滤波器输入或输出端,添加特定的缺陷地面结构,经过仿真分析表明了该方法的有效性。加工测试结果表明,K波段基片集成波导带通滤波器的1dB等纹波通带为19.18GHz-20.32GHz,带内回波损耗小于-15dB,在16-18GHz频段内衰减值大于50dB,在18.3-18.7GHz频段内衰减值大于20dB,在21-25GHz频段内衰减值大于30dB,满足了设计指标要求。与同波段E面矩形波导相比,体积减小了约50%。
[Abstract]:In order to make better use of the spectrum resources and to deal with the complex electromagnetic environment, the filter, which is the key device of signal isolation, is required for frequency selection. At the same time, the popularity of mobile devices also promotes the development of filter miniaturization. Substrate integrated waveguide is a new type of planar circuit transmission line structure. It is a kind of circuit structure which is similar to the transmission characteristic of traditional waveguide by reasonably arranging metallized perforation and other structures by using common planar circuit processing technology. Substrate integrated waveguide not only has some advantages of traditional waveguide structure and planar circuit structure, but also has its unique structural characteristics. The design of the substrate integrated waveguide bandpass filter is carried out by analogy with the traditional rectangular waveguide structure. Because of the structural characteristics of the substrate integrated waveguide, it is similar to the traditional rectangular waveguide in electromagnetic wave propagation. By using this equivalent relation and referring to the mature design method of waveguide filter, the design of substrate integrated waveguide bandpass filter is completed quickly and effectively in K band and X band according to the requirements of the project. Firstly, the structure and propagation characteristics of the substrate integrated waveguide are studied, and the relationship between the substrate integrated waveguide and the traditional metal waveguide is analyzed. A K band E plane metal diaphragm waveguide filter is designed, and the design idea and method of a set of waveguide filter are analyzed and summarized. Then, the inductive metal through hole filter structure is used in the substrate integrated waveguide structure, and the design of the substrate integrated waveguide bandpass filter is completed in K band and X band, analogous to the E plane metal diaphragm waveguide filter. Finally, a method to improve the suppression effect of substrate integrated waveguide filter is proposed. Based on the band-stop frequency response characteristics of defective ground structures, a specific defective ground structure is added at the input or output end of the substrate integrated waveguide filter. The simulation results show that the proposed method is effective. The processing test results show that the 1dB isoripple band of the integrated waveguide bandpass filter in K band is 19.18GHz ~ 20.32GHz, the in-band echo loss is less than -15dB, the attenuation value is greater than 50dB in 16-18GHz band, the attenuation value is more than 20dB in 18.3-18.7GHz band, and the attenuation value in 21-25GHz band. More than 30 dB, meet the design requirements. Compared with the same wave band E plane rectangular waveguide, the volume of the waveguide is reduced by about 50%.
【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】：TN713.5

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