基于多模谐振器的微带滤波器的研究

发布时间：2018-06-18 16:32

本文选题：微带滤波器 + 多模谐振器　；参考：《北京邮电大学》2015年硕士论文

【摘要】：本论文主要针对枝节加载型多模谐振器进行了深入研究。在多模谐振器研究的基础之上提出了一系列高性能宽带带通滤波器,高性能多结构宽带滤波器,带宽分别可调型双通带滤波器和通带带宽电可调型宽带滤波器结构。论文的第一章中首先对现代无线通信的新发展方向进行了阐述。根据这些新的发展方向,提出了目前微波系统的发展方向和新的性能需求。根据这些微波系统的新要求,仔细分析了现在微波滤波器需要满足的性能和具备的特点。随后,介绍了目前的一些主流的滤波器技术和设计方法,并且对这些方法和结构进行了比较和分析。然后详细介绍了微波带通滤波器的各种技术指标、每种滤波器参数性能的具体作用和目前的研究进展等。通过将之前发表的工作对比和与目前微波系统的具体要求进行比较,确定在滤波器的研究当中应该侧重哪些滤波器性能的改善和研究。通过研究发现,同时实现高选择性和高带外抑制性能是现在滤波器发展的亟需解决的难题,也是今后滤波器结构发展的主要方向。论文的第二章主要介绍了三种使用新型枝节加载型多模谐振器构成的宽带高性能滤波器结构。第二节中提出了一种改进型的恒定阻抗枝节加载型多模谐振器和可用于馈电电路上的T形谐振器,通过使用这些谐振器,能够在通带中产生四个传输极点,并同时在阻带中产生四个传输零点。使用该结构实现的滤波器可以获得很好的通带传输性能和阻带抑制性能。第三节中提出了一种阶梯阻抗枝节加载型多模谐振器,使用这种谐振器的宽带滤波器,能够同时具备高选择性和很好的带外抑制能力,这种性能在使用传统的枝节加载型多模谐振器的滤波器中是不能同时实现的。第四节中提出了一种圆形和T形混合枝节加载型多模谐振器。使用这种谐振器设计的宽带滤波器,能够将传统的多模谐振器中的谐频响应移动到滤波器通带当中,使得滤波器的带宽得到很大程度的增加,并且极大拓展了滤波器的上阻带范围。论文的第三章提出了一种结合多模谐振器和三线耦合结构的滤波器结构。通过结合使用多模谐振器和三线耦合结构,可以结合多模谐振器的高选择性能和三线耦合结构的高带外抑制性能,使得最终滤波器与其他滤波器相比,具有最高的性能。论文的第四章提出了两种使用新型枝节加载型多模谐振器构成的带宽可以分别调整的双通带滤波器结构。第二节中提出了一种改进型的枝节加载型多模谐振器和源载耦合结构。通过使用单个多模谐振器,可以实现带宽和中心频率可以分别调整的双通带滤波器。第三节中提出了一种具有耳朵形耦合结构的短路枝节加载型双模谐振器。两个双模谐振器不同模之间的耦合系数,可以通过调整谐振器之间的间距和耳朵结构的尺寸分别实现调整。因此使用该结构可以实现带宽分别可调的双通带滤波器和高选择性、高带外抑制能力的单通带滤波器。第五章提出了一种改进型电可调阶梯阻抗枝节加载型多模谐振器结构。仅使用一种多模谐振器结构的情况下,就可以实现具有了优异的零极点调整特性,从而实现上下截止频率的精确调整的带通滤波器。并且,所实现的滤波器具有很好的通带选择性和带外抑制性能。在只使用可调多模谐振器的可调滤波器参考文献当中比较,本章的滤波器可以实现最高的上下截止频率调节范围,最大的滤波器带宽调整范围,最好的带外抑制性能,最好的通带回波损耗性能。
[Abstract]:A series of high performance wideband bandpass filters, high performance multi structure wideband filters, bandwidth tunable double band filters and band bandwidth tunable broadband filters are proposed on the basis of the study of multimode resonators.
In the first chapter, the new development direction of modern wireless communication is expounded. According to these new development directions, the development direction and new performance requirements of the microwave system are put forward. According to the new requirements of these microwave systems, the performance and characteristics that the microwave filters need to meet now are carefully analyzed. Then, The current mainstream filter technology and design methods are introduced, and the methods and structures are compared and analyzed. Then the various technical indexes of the microwave bandpass filter, the specific function of each filter's parameter performance and the current research progress are introduced in detail. The specific requirements of the pre microwave system are compared, and it is determined which filter performance improvement and research should be focused on the filter research. Through research, it is found that high selectivity and high off band suppression performance are the urgent problems to be solved in the development of the filter and the main direction of the development of filter structure in the future.
The second chapter of the paper mainly introduces the broadband high performance filter structure composed of three new type of branch loaded multimode resonators. In the second section, an improved constant impedance branch loaded multimode resonator and a T shaped resonator on the feed circuit are presented. By using these resonators, it can be produced in the passband. Four transmission poles are transmitted and four transmission zeros are produced in the stopband. The filter can achieve good passband transmission performance and band suppression performance. The third section proposes a stepped impedance branch loaded multimode resonator, which can be used with high selectivity at the same time. And good out of band suppression, this performance can not be realized at the same time in the filters using traditional branch loaded multimode resonators. A circular and T shaped hybrid multimode multimode resonator is proposed in section fourth. A broadband filter designed by this resonator can be used in the harmonic frequency of the traditional multimode resonator. In response to moving to the filter passband, the bandwidth of the filter is greatly increased, and the upper stopband range of the filter is greatly expanded.
In the third chapter, a filter structure combining multimode resonator and three wire coupling structure is proposed. By combining the multimode resonator and the three line coupling structure, the high selective performance of the multimode resonator and the high off band suppression performance of the three line coupling structure can be combined to make the final filter have the highest performance compared with the other filters. Performance.
In the fourth chapter of this paper, two kinds of bandband filter structures which can be adjusted by the new type of branch loaded multimode resonators are proposed. In the second section, an improved branch loaded multimode resonator and the source coupled structure are proposed. By using a single multimode harmonic oscillator, the bandwidth and the central frequency can be realized. In the third section, a short circuited double mode resonator with an ear shaped coupling structure is proposed. The coupling coefficient between the different modes of the two dual mode resonators can be adjusted by adjusting the distance between the resonators and the size of the ear structure. Dual bandpass filters with high bandwidth and adjustable band pass and single band pass filters with high selectivity and high band rejection capability are available.
In the fifth chapter, an improved electrically adjustable staircase impedance branch loaded multimode resonator is proposed. With only one multi mode resonator structure, a band pass filter with excellent zero pole adjustment characteristics can be realized so that the upper and lower cut-off frequency can be adjusted accurately. Moreover, the filter is very good. Compared with the tunable filter references that only use adjustable multimode resonators, the filters in this chapter can achieve the highest up and down cut-off frequency adjustment range, the maximum filter bandwidth adjustment range, the best out of band suppression energy, and the best pass band echo loss performance.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

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