微带线平衡滤波器的研究与设计

发布时间：2018-09-08 19:58

【摘要】：在无线通信系统中,全平衡系统具有优越的电磁兼容特性,可以有效地抑制环境和内部有源器件产生的噪声,因而得到了广泛的应用。在全平衡通信系统尤其是射频电路的前端,平衡滤波器有着重要的应用和研究价值。论文主要对微带线平衡滤波器展开了研究与设计。首先研究了平衡滤波器的四端口网络特性及耦合特性,总结了常用的产生传输零点和抑制共模噪声的方法,这是设计高性能平衡滤波器的基础。然后深入研究了平衡滤波器领域中几款重要的器件,包括:平衡宽阻带滤波器,平衡双通带滤波器以及平衡双工器。论文的主要内容包含以下几个方面:1.为分析、设计和测试平衡滤波器,本文首先对平衡四端口网络的混合S参数进行了分析,建立了混合S参数与传统的四端口S参数之间的转换关系,同时证明了用奇偶模方法分析对称平衡器件的正确性;为了改善平衡滤波器的性能,重点研究了产生传输零点以及抑制共模噪声的方法。2.研究了阶跃阻抗谐振器(SIR)的谐振特性,设计出了一款结构新颖紧凑、损耗小、频率选择性高、阻带范围达到10f0处的宽阻带滤波器,并以此为基础来设计平衡宽阻带滤波器,然后提出了加载短路双模谐振器提高共模抑制的方法,最后以滤波器实物加以验证。3.详细的分析了微扰闭环型及短路枝节加载型双模谐振器的特性,基于这两种双模谐振器提出了设计带宽和中心频率分别独立可控的平衡双通带滤波器的全新方法。文中给出了设计流程,测试和仿真结果的一致性验证了理论分析的正确性。4.给出了基于缺陷地(DGS)双模谐振器的平衡双工器的设计方法,对缺陷地双模谐振器的谐振特性、场分布以及耦合特性进行了深入研究,并提出了匹配自由度较高的公共端阶跃阻抗馈电结构。最后设计了具有良好差模及共模响应的平衡双工器,仿真与实验测试结果符合良好。
[Abstract]:In wireless communication systems, the fully balanced system has excellent electromagnetic compatibility characteristics, which can effectively suppress the noise generated by the environment and internal active devices, so it has been widely used. In full balanced communication system, especially in the front end of RF circuit, balanced filter has important application and research value. In this paper, the microstrip line balance filter is studied and designed. Firstly, the four-port network characteristics and coupling characteristics of the balanced filter are studied, and the commonly used methods of generating transmission zeros and suppressing common-mode noise are summarized, which is the basis of the design of high performance balanced filter. Then several important devices in the field of balanced filter are studied, including: balanced wide stopband filter, balanced double pass band filter and balanced Duplexer. The main content of the paper includes the following aspects: 1. In order to analyze, design and test the balanced filter, this paper first analyzes the hybrid S parameters of the balanced four-port network, and establishes the conversion relationship between the hybrid S parameters and the traditional four-port S parameters. In order to improve the performance of the balanced filter, the methods of generating transmission zeros and suppressing common-mode noise are mainly studied. The resonant characteristics of step impedance resonator (SIR) are studied. A novel and compact structure, low loss, high frequency selectivity, and a wide stopband filter with a stopband range up to 10f0 is designed, and a balanced wide stopband filter is designed. Then, a method to improve the common mode suppression by loading a short circuit dual mode resonator is proposed. Finally, the filter is used to verify it. In this paper, the characteristics of the perturbation closed-loop and short-circuit double-mode resonators are analyzed in detail. Based on the two kinds of double-mode resonators, a novel method of designing a balanced double-pass band filter with independently controllable bandwidth and center frequency is proposed. The design flow is given. The consistency of test and simulation results verifies the correctness of the theoretical analysis. The design method of balanced duplex based on defect ground (DGS) dual mode resonator is presented. The resonant characteristics, field distribution and coupling characteristics of defect ground dual mode resonator are studied. A common end step impedance feed structure with high matching degrees of freedom is proposed. Finally, a balance duplex with good difference mode and common mode response is designed, and the simulation results are in good agreement with the experimental results.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

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