节点文献
微波接收机无源关键技术研究
Key Technique Studies on Passive Components in Microwave Receiver
【作者】 杨茂辉；
【导师】 徐军；
【作者基本信息】 电子科技大学 ， 无线电物理， 2010， 博士
【摘要】 论文主要对微波接收机无源电路进行研究。提出了多种小型化宽阻带低通滤波器、带阻滤波器、超宽带滤波器(UWB)和双模双通带滤波器的设计方案。针对毫米波接收前端设计了一款新型微带—波导过渡结构。所设计的电路具有结构紧凑,性能优良,易于集成等优点,有较好的应用前景。第一章介绍了微波接收前端的工作原理,微波滤波器的研究现状及其进展。对宽阻带低通滤波器,超宽带滤波器,双通带滤波器的研究现状进行了比较详细的介绍。同时对缺陷地结构(DGS)和槽线加载谐振器结构(PLS)的带阻特性及其应用也作了介绍。第二章系统研究了滤波器的设计理论。介绍了几种不同类型的低通原型滤波器,并给出了低通至高通、带阻、带通响应的频率变换公式。广义切比雪夫滤波器传递函数的综合及耦合矩阵的提取也在本章中有所阐述。第三章提出了一款平行耦合阶梯阻抗谐振器加载的发卡型谐振器。给出了此谐振器在低通滤波器设计中的LC模型和传输矩阵。并用此谐振器及其改进型设计了几款小型化、宽阻带的低通滤波器。同文献中报道的其他类型的低通滤波器相比,所设计的滤波器在体积,阻带宽度,带外抑制等方面有明显优势。第四章分析了DGS和PLS结构的带阻和慢波特性。提出了高Q值的DGS和PLS谐振器,并用此谐振器设计了多款带阻滤波器。利用DGS结构的慢波和带阻特性,与传统的高通滤波器结合,设计了宽阻带UWB,不仅在体积和阻带上有改进,也解决了传统PBG结构加载型UWB因微带线过细而制作困难的弊端。第五章研究了中心枝节加载型双模谐振器,并利用双模谐振器中两模式的相对独立性,设计出了带宽独立可调的双模双通带滤波器。此种滤波器的结构紧凑,并因抑制了寄生通带而获得比较宽的阻带。第六章分析了微带—波导过渡的研究背景。利用槽线天线的高增益、高方向性和超宽带特性,设计了全Ka波段新型微带—波导过渡。此过渡结构体积小,通带平坦度好,插损小,非常适合于实际的工程应用。第七章对全文工作进行总结,以及对未来工作的展望。
【Abstract】 Microwave receiver and passive components including filters and microstrip-to-waveguide transition are studied. Several schemes for wide-stopband lowpass filters (LPF), ultra-wide band (UWB) filters, and dual-mode dual-band filters are proposed. Besides, a novel minimized waveguide-to-microstrip transition is designed which necessary in millimeter-wave receivers. All these passive components have merits of compact size, improved performances, and easy integrated, which can be used widely in future receiver systems.In chapter 1, the basic principle of microwave receiver and the background and the progresses of microwave filters are introduced, including wide-stopband LPF, ultra-wide band filter, and dual-mode dual-band filter. The stopband characteristics of the defected ground structures (DGS) and patch loaded slotline (PLS) are also mentioned in this chapter.In chapter 2, systematic research on the design theory of filters. Different types of lowpass prototype filters are introduced and element transformations for lowpass prototype to highpass, stopband, and bandpass responses are given. Besides, synthesis methods of transfer function and general coupling matrix for chebyshev filtering functions are also discussed in this chapter.In chapter 3, a parallel stepped impedance resonators (SIR) loaded hairpin resonator is proposed. The equivalent LC circuit and transmission matrix of the new resonator used in LPF design is given. Several LPFs with wide stopband are designed using this resonator and improved ones. Comparing with other LPFs reported in open literatures, the new LPFs designed in this chapter have merits of decreased size, wide-stopband, and improved stopband.In chapter 4, several classic characteristics of DGS and PLS are studied, such as stopband and slow-wave characteristics. A novel resonator with high Q factor is proposed and filters using the new resonator are designed. A UWB filter with DGS is investigated and it has a minimized size and a very wide stopband comparing with conventional ones. Furthermore, the DGS loaded UWB can avoid a disadvantage which the periodic bandgap (PBG) structures loaded UWB will met with that the line is too narrow to be fabricated.In chapter 5, characteristics of stub loaded dual-mode resonator are studied. A new kind of dual-mode dual-band filter using this resonator is designed and two passband of it can be adjusted separately. The new dual-mode dual-band filter is compact and has excellent stopband performances with the second harmonic was completely compressed.In chapter 6, the background of microstrip-to-waveguide transition is simply presented. A new kind of microstrip-to-waveguide transition is proposed using slot antenna, which has high gain, narrower beam, and wide radiation band. The new transition has compact size, small ripples and low insertion losses in the passband. Because of these characteristics, this transition is fit for practical circuit.In chapter 7, a summary of the whole dissertation and potential research topics are given.