平面馈入式多层腔体滤波器研究

发布时间：2018-07-10 10:56

本文选题：毫米波 + 接口平面化　；参考：《电子科技大学》2017年硕士论文

【摘要】：随着通信技术的向前发展,尤其是移动互联网的迅速崛起,海量的数据需要借助于通信设备进行传输。微波频谱资源已经不能满足当前的社会要求,进一步开发高频频谱资源已经是行业的趋势。滤波器在整个系统中充当着选频的作用,它性能的好坏直接影响着通信质量。腔体滤波器在高频频段仍具有高Q值,滤波器带内损耗较平面滤波器有很大的优势。因此,在高频频段腔体滤波器占据主导地位,然而滤波器体积大、不易于同其他器件连接等原因制约着其发展前景。MEMS、LTCC等技术的出现在一定程度上解决了这一难题,但是用这些工艺制作出的滤波器价格昂贵、加工周期长。本文针对腔体滤波器接口的平面化和小型化问题展开研究,致力于平面馈入式的腔体滤波器。在设计上,利用谐振腔之间的交叉耦合和部分谐振器采用新的结构,尽可能减小滤波器的体积。在工艺上,为了实现接口的平面化将外部电路印制在PCB基片上,通过基片背面开槽将能量耦合到谐振腔中。本文根据滤波器的基本原理和耦合理论设计、加工和测试了多款滤波器。主要的内容可概括为:第一,对金属谐振腔和耦合结构进行讨论,成功的设计了一款Ku波段多层腔体滤波器,其结构比较简单。为了实现接口平面化,将外部耦合电路印制在PCB基板上然后通过槽耦合到谐振腔内;为了尽量减小腔体的平面面积将六个谐振腔分三层垂直堆叠,每层两个谐振腔。第二,对半波长悬梁结构谐振理论进行深入研究,成功的设计了三款新型Ka波段多层腔体滤波器,滤波器结构相对有些复杂。为了实现接口平面化,将外部耦合电路印制在PCB基板上然后通过槽耦合到谐振腔内;滤波器谐振结构长度为半波长TEM波,这种类型的滤波器较传统波导类型滤波器有更小的体积和更宽的阻带。第三,利用MEMS先进的技术工艺设计、制作了两款W波段的腔体滤波器,滤波器结构为四个并排相连的谐振腔组成。通过比较体现了广义切比雪夫滤波器具有更好的性能。
[Abstract]:With the development of communication technology, especially the rapid rise of mobile Internet, huge amounts of data need to be transmitted by means of communication devices. Microwave spectrum resources can not meet the current social requirements, further development of high frequency spectrum resources has been the trend of the industry. The filter acts as the frequency selector in the whole system, and its performance directly affects the communication quality. The cavity filter still has a high Q value in the high frequency band, and the in-band loss of the filter has a great advantage over the plane filter. Therefore, cavity filter occupies the dominant position in the high frequency band. However, the large size of the filter, which is difficult to connect with other devices and other reasons, restricts the development prospects of the filter. The appearance of the technology, such as MEMS / LTCC, solves this problem to a certain extent. But the filter made by these processes is expensive and has a long processing period. In this paper, we focus on the planarization and miniaturization of cavity filter interface, and focus on the planar feed-in cavity filter. In design, the cross-coupling between resonators and the new structure of partial resonators are used to minimize the size of the filter. In the process, the external circuit is printed on the PCB substrate in order to realize the planarization of the interface, and the energy is coupled to the resonator through the slotted back of the substrate. According to the basic principle of filter and coupling theory, several filters are machined and tested in this paper. The main contents can be summarized as follows: first, the metal resonator and the coupling structure are discussed, and a Ku band multilayer cavity filter is successfully designed, the structure of which is relatively simple. In order to realize the interface planarization, the external coupling circuit is printed on the PCB substrate and coupled to the resonator through the slot. In order to minimize the plane area of the cavity, the six resonators are stacked vertically in three layers, with two resonators in each layer. Secondly, the resonance theory of half-wavelength cantilever structure is deeply studied, and three new Ka-band multilayer cavity filters are successfully designed. The structure of the filter is relatively complex. In order to realize the interface planarization, the external coupling circuit is printed on the PCB substrate and coupled to the resonator through the slot. This type of filter has smaller volume and wider stopband than conventional waveguide filter. Thirdly, two W-band cavity filters are fabricated using the advanced MEMS technology. The filter structure is composed of four resonators connected side by side. The comparison shows that the generalized Chebyshev filter has better performance.
【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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