【作者】 张博；

【导师】 刘元安；

【作者基本信息】 北京邮电大学 ， 电子科学与技术， 2018， 博士

【摘要】 滤波微波器件是将信号滤波功能集成到传统微波器件中的一种单体多功能微波器件。为了滤除电路系统中的干扰信号,以及非线性器件中产生谐波和交调信号,需要在射频前端电路的众多关键节点处增加滤波微波器件。相比传统的直接级联滤波器的设计方法,滤波微波器件能够极大减小电路尺寸、降低插入损耗、改善滤波性能并降低设计复杂度。本论文提出了多种滤波单元结构,并设计了宽带单端和差分带通滤波器、滤波功率分配器、滤波推挽功率放大器、基于谐振匹配的天线以及滤波微波交叉器等滤波微波器件的电路拓扑和结构。论文的主要工作如下:(1)提出了终端加载型耦合线电路结构,并对其阻抗匹配和滤波特性进行了详细的理论分析;通过采用不同种类的终端加载电路结构分别设计了单端超宽带带通滤波器、单端宽带带通滤波器以及差分宽带带通滤波器结构。详细分析了这些电路的工作机制和设计流程,并进行了实例仿真和实验验证。相关研究成果以第一作者SCI学术论文发表在国际学术期刊 IEEE Transactions on Microwave Theory and Techniques上。(2)成功解决了传统四分之波长传输线的谐波抑制和小型化的难题,提出谐波抑制型双传输线结构,并对其设计理论和滤波特性进行理论分析。创新性地将其应用到传统四分之波长传输线构成的宽带滤波器中,成功设计出具有高选择性以及极高上阻带抑制性能的小型化宽带滤波器。相关研究成果以第一作者SCI学术论文发表在国际学术期刊 Electronics Letters 上。(3)提出和分析了一系列使用终端加载型双线和三线耦合结构设计的高选择性和带外抑制性能的紧凑型滤波功率分配器结构;推导出详细的电路参数和滤波特性的求解和设计理论。最终设计了滤波功率分配器实例并进行仿真和实验验证。相关研究成果已经发表在SCI检索的国际学术期刊 Electronics Letters,Microwave and Optical Technology Letters,Journal of Electromagnetic Waves and Applications 上。(4)在国际上首次提出窄带和宽带滤波推挽功率放大器的电路拓扑结构;创新性地将信号滤波、单端差分转换以及阻抗匹配集成在一个电路结构中,简化了滤波推挽功率放大器的电路结构,极大缩小了电路面积,并改善了功率放大器的输出功率和效率。设计了滤波推挽功率放大器实例并进行仿真和实验验证。相关研究成果以第一作者SCI学术论文发表在国际学术期刊Electronics Letters上,并被选为当月特色论文。(5)提出了基于谐振匹配的智能手机四单元天线阵列;通过使用基于谐振的匹配网络,成功解决了原有天线单元结构在低频工作频段内带宽不足的问题。设计了能够支持八个工作频段的四单元智能手机天线阵列。相关研究成果以第一作者EI学术论文的形式发表在国际会议 International Symposium on Electromagnetic Compatibility 上。(6)提出了新颖的传输路径具有不同工作频率范围的宽带滤波微波交叉器电路拓扑结构;成功解决了传统微波交叉器在两个传输路径的工作频段相隔较远的工作模式下的带宽不足问题。并对该滤波交叉器结构进行了实例设计和实验验证。相关研究成果以第一作者SCI学术论文的形式发表在国际学术期刊Microwave and Optical Technology Letters上。更多还原

【Abstract】 Microwave components with filtering responses,also called filtering microwave components,are multi-fuction components,which are implemented by integrating the filtering responses to the conventional various microwave components.In order to suppress the interferences in the front-end system as well as the inter-modulated or harmonic signals,many microwave filters need to be added.Compared with the conventional method by simply cascading the filters,the filtering microwave components can not only reduce the circuit size,insertion losses and design procedures,but also enhance the filtering responses.In this thesis,a series of single-ended/balanced bandpass filters(BPFs),filtering power dividers(PDs),filtering push-pull power amplifiers(PPPAs),resonator-based antenna array as well as filtering microwave crossover is introduced.The main contributions of this thesis are as follows:(1)A novel terminated coupled-line structure is presented.The design principles of impedance matching and filtering responses are theoretically derived.Introducing different types of terminations,two single-ended wideband BPFs and a balanced wideband BPF is proposed,with high passband selectivity and good stopband rejection performances.Then the design examples are simulated and measured to verify the proposed structures and design theory.This part of work is published in IEEE Transactions on Microwave Theory and Techniques.(2)The harmonic suppressed dual-transmission line structure with miniaturized size and harmonic suppression is introduced,which can replace the conventional quarter wavelength transmission line.The related design procedures and filtering responses are extracted theoretically.By replacing the conventional quarter wavelength transmission lines of wideband BPF with proposed dual-transmission lines,a wideband BPF with good passband selectivity and high out-of-band rejection is designed and measured.This part of work is published in Electronics Letters.(3)A series of wideband/narrowband filtering PDs with high selectivity and good stopband rejection is introduced based on terminated two-and three-conductor coupled-line structures.The detailed design parameters and filtering responses are theoretically derived.The design examples are simulated and measured to verify the proposed structures and design theory.This part of work is published in Electronics Letters,Microwave and Optical Technology Letters and Journal of Electromagnetic Waves and Applications.(4)The wideband/narrowband filtering PPPA topologies are firstly introduced.The signal filtering,unbalanced-to-balanced transforming and impedance matching characteristics are integrated in one circuit,which can miniaturize circuit size,enhance the output power and efficiency.The proposed topologies are verified by simulation and measurement.This part of work is published in Electronics Letters as a feature article.(5)Four-element antenna array for Octa-band smartphone applications is presented based on resonator-based impedance matching network,which can greatly improve the low-band bandwidth and impedance matching characteristics.This part of work is published in International Symposium on Electromagnetic Compatibility.(6)A compact wideband crossover with filtering response is presented,with separated operating frequencies in two transmission paths.The key difficulty of conventional crossovers when handling two widely separated frequency ranges in different transmission paths is successfully overcome.A filtering crossover design example is fabricated and measured to verify the proposed structure.This part of work is published in Microwave and Optical Technology Letters.更多还原