多频滤波器及多工器的研究

发布时间：2018-08-07 16:04

【摘要】：在无线技术迅猛发展的今天,人们对射频器件的指标要求越来越高。不仅需要通带低插损,阻带高衰减,由于频段的拥挤,对滤波器边缘选择性的也有很高的要求。另外,在竞争日益激烈的通信行业中,对滤波器体积的小型化也是一项重要的工作。由于现在多种通信标准并行,对于多频器件的研究是社会发展趋势的要求。而带阻滤波器作为通信系统中一个不可或缺的器件,对其进行透彻的研究具有重要的意义。本文将结合当代对射频滤波器的主要指标要求,对多频带阻滤波器展开细致的研究,目标在于提出新型的设计方法,相比于已有的多频带阻滤波器,在性能上做出较大的提升,以满足更高的实际要求。本文的主要工作有以下几点:1、研究并设计性能优异的三频带通滤波器。对于多频滤波器,主要的设计思路是使用支节线加载谐振器(SLR)或阶跃阻抗谐振器(SIR)。这两种谐振器以前多用于双频滤波器的设计中。文章对这两种谐振器做详细研究,并将其用于三频带通滤波器的设计中,目标在于实现良好的带内带外性能,并具有较大的可调范围。文章首先对谐振器的工作原理进行分析,随后通过全波仿真软件对所设计的滤波器进行仿真和优化,同时给出设计参数曲线图。最后我们对设计的滤波器进行加工和测试。仿真和测试的结果相吻合,证明了分析方法和设计方法的正确性。我们将该成果发表于期刊Micorwave and Optical Technology Letters。2、研究混合电磁耦合的原理及其在滤波器设计中的应用。传统腔体滤波器经常通过交叉耦合产生传输零点,但交叉耦合受限于刻板的拓扑结构,对应用造成不便。我们发现通过电磁混合耦合同样可以在带外产生传输零点,从而可以作为一个优秀的替代品。我们使用阶跃结构的耦合窗口,引入可控的电磁混合耦合,设计了一个腔体带通滤波器。同时,我们加入螺旋馈电结构,使得外部品质因数的可调范围大大增加。这两种结构我们均提供了详细的设计参数图表。该成果发表于期刊IEEE Microwave and Wireless Component Letters。3、研究多频带通滤波器在多频双工器和三工器中的应用。在双工器和三工器的设计中,各个通道的隔离取决于匹配网络的设计。若各个通道能实现独立控制,则会为设计带来很大的方便。我们使用开路支节线和短路支节线设计了一个新型匹配网络,能方便地支持多个通道。文中给出了系统的设计过程,并对最终设计出的双工器和三工器进行加工和测试,测试结果与仿真结果相吻合。该成果发表于期刊IEEE Microwave and Wireless Component Letters。
[Abstract]:With the rapid development of wireless technology, people demand higher and higher standards of RF devices. Not only the low insertion loss of passband and high attenuation of stopband are required, but also the edge selectivity of filter is very high due to the crowding of frequency band. In addition, the miniaturization of filter size is also an important task in the increasingly competitive communications industry. Due to the parallelism of many communication standards, the research of multi-frequency devices is the requirement of social development. As an indispensable device in communication system, it is of great significance to study the band-stop filter thoroughly. In this paper, according to the main requirements of the modern RF filter, a detailed study on the multi-band resistive filter will be carried out. The aim is to propose a new design method. Compared with the existing multi-band resistive filter, the performance of the multi-band resistive filter will be greatly improved. To meet higher practical requirements. The main work of this paper is as follows: 1. Research and design three-band pass filter with excellent performance. For multi-frequency filter, the main design idea is to use branch line to load resonator (SLR) or step impedance resonator (SIR). These two resonators were used in the design of dual frequency filters. In this paper, the two kinds of resonators are studied in detail and used in the design of three-band pass filters. The goal is to achieve good in-band and out-of-band performance and have a large adjustable range. In this paper, the working principle of the resonator is analyzed, then the filter is simulated and optimized by full-wave simulation software, and the curve of design parameters is given. Finally, we process and test the designed filter. The results of simulation and test are in agreement with each other, which proves the correctness of the analysis method and the design method. We publish this work in the journal Micorwave and Optical Technology Letters.2.We study the principle of hybrid electromagnetic coupling and its application in filter design. Traditional cavity filters often generate transmission zeros by cross-coupling, but cross-coupling is limited by the stereotype topology, causing inconvenience to applications. We find that the transmission zeros can also be generated by electromagnetic hybrid coupling, which can be used as an excellent substitute. A cavity band-pass filter is designed by using the coupling window of the step structure and the controllable electromagnetic hybrid coupling. At the same time, the adjustable range of external quality factor is greatly increased by adding helical feed structure. We provide detailed design parameter diagrams for both structures. The study, published in the journal IEEE Microwave and Wireless Component Letters.3, studies the application of multi-band pass filters in multi-frequency duplex and triplexer. In the design of duplex and triplexer, the isolation of each channel depends on the design of matching network. If each channel can achieve independent control, it will bring great convenience to the design. We design a new matching network using open branch and short circuit branch, which can support multiple channels conveniently. The design process of the system is given, and the final duplex and triplexer are machined and tested. The test results are in agreement with the simulation results. The results are published in the journal IEEE Microwave and Wireless Component Letters.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN713

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