新型宽带带阻微带滤波器设计

发布时间：2019-03-19 12:36

【摘要】：缺陷地结构(DGS)是在微带传输线的接地金属板上刻蚀出周期或者非周期的结构,进而改变微带传输线的分布电容和电感,使其表现出带阻和慢波等特性。由于DGS结构简单、尺寸小、容易加工、具有单极点阻带和改变传输线特性阻抗的特性,所以对改善宽带带阻滤波器的性能起到重要的作用,比如对谐波的抑制、增加阻带宽度、减小物理尺寸等,因此受到了越来越多学者的重视。本文首先分析了几种比较传统的DGS结构：矩形DGS、哑铃型DGS和螺旋形DGS,并对这些结构作了比较。紧接着着重介绍了“C”型DGS结构,并分析各个参数对带阻滤波器传输特性的影响。其次,在研究C型DGS的基础上提出一种金属圆柱加载结构,相比不加载金属圆柱的C型DGS,具有很好的宽带和阻带内衰减效果,同时不增加滤波器的尺寸,进而验证了该结构在小型化设计中的重要性。然后,将金属圆柱加载的C型DGS进行级联设计宽带带阻滤波器,有效的提高了带阻滤波器的阻带深度和宽度,同时获得了比较好的通带插损。最后,将这种级联结构和缺陷地开口谐振环结合设计新型宽带带阻滤波器,在获得足够带宽和带内衰减的同时通带内波纹比较小,而且阻带到通带的变化曲线比较陡峭,这样大大提高了对信号的抑制性能。通过对该新型宽带带阻滤波器进行实物测试和仿真结果比较,进而验证了该结构的实用性和有效性。
[Abstract]:The defect ground structure (DGS) is a periodic or aperiodic structure etched on the ground metal plate of the microstrip transmission line, and then the distributed capacitance and inductance of the microstrip transmission line are changed so that the microstrip transmission line exhibits the characteristics of band resistance and slow wave. Because DGS is simple in structure, small in size and easy to process, it has the characteristics of single pole stop band and changing the characteristic impedance of transmission line, so it plays an important role in improving the performance of broadband band-stop filter, such as suppressing harmonics and increasing the band-stop width. Therefore, more and more scholars pay more and more attention to the reduction of physical size and so on. In this paper, several traditional DGS structures, rectangular DGS, dumbbell DGS and spiral DGS, are analyzed and compared. Then the "C" DGS structure is introduced, and the influence of each parameter on the transmission characteristics of the band stop filter is analyzed. Secondly, based on the study of C-DGS, a metal cylinder loaded structure is proposed. Compared with C-DGS, without metal cylinder, C-DGS, has better broadband and in-band attenuation effect, and does not increase the size of filter. Furthermore, the importance of the structure in miniaturization design is verified. Then, the C-DGS loaded by a metal cylinder is cascaded to design a broadband band-stop filter, which can effectively improve the band-stop depth and width of the band-stop filter, and obtain a good pass-band insertion loss at the same time. Finally, a new broadband band-stop filter is designed by combining the cascade structure and the defective open-ended resonant ring. While obtaining sufficient bandwidth and in-band attenuation, the ripple in the passband is smaller, and the curve of the band resistance to the passband is steep. This greatly improves the signal suppression performance. Through the physical test and simulation results of the new broadband band-stop filter, the practicability and effectiveness of the structure are verified.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

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