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小型化微波多端口耦合功分电路的研究
【作者】 段茜文；
【导师】 冯文杰；
【作者基本信息】 南京理工大学 ， 电子与通信工程（专业学位）， 2020， 硕士
【摘要】 作为微波系统的基本无源组件,耦合功分电路广泛应用于混频器、阵列天线的馈电网路以及放大器设计中,影响着整个系统的性能。为适应近年来微波电路高集成的发展趋势,耦合功分电路在保证性能的同时,亟待实现小型化的设计。电路系统设计趋于密集紧凑,对于具备高稳定性以及良好抗干扰能力的多端口平衡电路也提出了紧迫的需求。此外,现代通信系统的发展伴随着系统工作频率的提升,利用间隙波导等新型传输结构来提高无源电路在毫米波波段的性能也成为目前研究的热点。为解决上述问题,本文主要针对小型化微波多端口耦合功分电路开展研究,主要工作内容如下:1、基于开路/短路枝节加载的小型化双频分支线耦合器的分析与设计:传统分支线耦合器可以实现直通端口和耦合端口的功率分配,输出端口相位相差90°,且保证各端口匹配与隔离良好。在此基础上,通过加载半波长开路/短路枝节,在保证耦合器尺寸紧凑的同时实现双频工作。所提出的两个结构双频工作频比与功分比易于调节,且结构简单,便于加工。2、基于双面平行带线(DSPSL)的小型化八端口平衡式双频耦合器的分析和设计:首先介绍了DSPSL的基础特性与混合模S参数。利用八端口混合模S参数和DSPSL的结构特点,设计了具有宽带上的共模抑制特性的八端口平衡式耦合器。此外,通过加载一对半波长短路枝节,实现了平衡式耦合器的双频工作。频比与功分比易于通过改变传输线阻抗值来调节。3、基于脊间隙波导(RGWG)Ka波段宽带Gysel功分器的分析与设计:设计了凹槽-销钉型GWG单元结构,拓宽了电磁带隙的阻带带宽;在所提出的GWG单元结构基础上,设计出Ka波段的Gysel功分器。并设计了新型的Ka波段RGWG到微带线的转换结构。所提出的结构工作带宽较宽,损耗低,体积小,结构简单易于加工。
【Abstract】 As the basic passive component of a microwave system,couplers and power dividers are widely used in the design of mixers,array antenna feed networks,and amplifiers,and restrict the performance of the entire system.In order to adapt to the development trend of high integration of microwave circuits in recent years,while ensuring performance,the coupler and power divider need to be miniaturized.The circuit system design tends to be dense and compact,and there is an urgent need for multi-port balanced circuit with high stability and good anti-interference ability.In addition,the development of modern communication systems is accompanied by an increase in the operating frequency of the system,and the use of new transmission structures such as gap waveguides to improve the performance of passive circuits in the millimeter wave band has also become a research hotspot.In order to solve the problems mentioned above,this thesis is focused on the research of compact microwave multi-port coupling/power division circuits,and the main contribution of this work is summarized as bellow:1.Analysis and design of compact dual-band branch-line coupler with short/open-ended stubs: Traditional branch line couplers can realize power division between the straight output port and the coupling output port,and ensure good port match and isolation.On this basis,by loading half-wavelength open/short-ended stubs,dual-frequency operation is achieved while keeping the size of the coupler compact.The passband frequency and power division ratio of the two proposed structures can be adjusted conveniently,and the structure is simple and easy to process.2.Analysis and design of a miniaturized eight-port balanced dual-frequency coupler based on a double-sided parallel strip line(DSPSL): The basic characteristics of DSPSL and the mixed-mode S-parameters are introduced.Using the eight-port mixed-mode S-parameters and the structural characteristics of DSPSL,an eight-port balanced coupler with common-mode rejection over broadband is designed.In addition,by loading a pair of half-wavelength short-ended stubs,the dual-frequency operation of the balanced coupler is realized.The passband frequency ratio and power division ratio can be easily adjusted by changing the transmission line impedance value.3.Analysis and design of Ka-band broadband Gysel power divider based on the ridge gap waveguide(RGWG): The groove-pin unit cell is designed to widen the GWG bandwidth.Based on the proposed GWG unit structure,a Ka-band Gysel power divider is designed.And designed a new Ka band RGWG to microstrip line conversion structure.The proposed structure has a wide bandwidth,low loss,compact size,simple structure and easy processing.