微波前端平面无源器件关键技术研究

发布时间：2018-01-12 15:17

本文关键词：微波前端平面无源器件关键技术研究　出处：《电子科技大学》2016年博士论文　论文类型：学位论文

【摘要】：随着现代无线通信技术的迅猛发展,新的工艺和技术的不断出现,微波毫米波系统正迅速朝高性能、小型化、多功能及低成本等方向发展。无源平面滤波器和功率分配/合成器仍作为微波通信系统中的关键器件,其性能和体积将直接影响整个通信系统的工作性能。研究高性能小型化的无源器件有利于减小系统体积,减轻系统重量,提高系统性能,因而具有重要的研究价值。本文通过采用阶梯阻抗、缺陷地、多模谐振单元、改进Gysel及Wilkinson等新型结构,研究设计了多种新型的高性能滤波器和功分器等平面无源器件,以改善微波通信系统的整体性能。主要研究内容概括如下:首先,基于阶梯阻抗结构,提出了两款内部加载的发夹结构。同时,给出了谐振器的传输矩阵及其LC等效电路。最后利用两种结构,设计了几个具有高选择性及超宽阻带的低通滤波器。由于内部加载不改变外观尺寸,并增强了慢波效应,所设计的滤波器在小型化方面具有极大的优势。其次,提出了一种新型的交指缺陷地结构(DGS)并给出了其等效电磁特性的LC模型。相较于传统缺陷地结构的一个传输零点,该结构可以实现三个带外传输零点,并具有优异的边带选择性。通过调节交指的尺寸,可以改变通带特性。基于该结构,在Rogers5880上设计了一款低通滤波器,该滤波器是由阶梯阻抗微带及两个缺陷地结构单元组成。此外,增加交指数,可以缩小通带截止频率,从而减小滤波器体积。基于此,设计了一款单级七交指的低通滤波器。相比于其它缺陷地低通滤波器,所设计的滤波器具有极其优异的通带选择特性。第三,提出了一种短路枝节加载的多模谐振器结构(MMR),并将其应用于超宽带(UWB)带通滤波器设计。相较于同类型的滤波器,此结构可以获得更宽的带宽。此外,提出了一种闭环加载的多模谐振器。在弱耦合的情况下,可以观察到六个谐振模式及三个传输零点。其中两个零点靠近通带边沿,另外一个零点位于通带内部。利用该谐振器设计了一款具有陷波特性的超宽带带通滤波器,该滤波器具有高频率选择性及带外抑制度。第四,研究了双通带滤波器。提出了一种新型枝节加载的互补裂环谐振器(CSRR),并将其应用于双通带滤波器的设计。通过调节加载枝节的尺寸,可以改变两个通带间传输零点的个数,从而增强了双通带滤波器设计的灵活性。测试表明该滤波器具有邻近的通带中心频率,高通带隔离度以及两次谐波抑制特性。另外,提出了一种交叉的H型双模谐振器,并利用奇偶模分析法研究其谐振特性。通过级联两个该谐振单元,并在偶模间引入额外的耦合路径,可以单独调节第二通带的中心频率及带宽。此外,还提出了一种开路加载的闭环谐振器,该结构具有四个谐振模式。其中每两个模式形成一个通带,两个通带相对可调。基于此结构,设计了一款可应用于短距离无线通信的高选择性双通带滤波器。本章所提出的滤波器具有灵活的设计性,在现代多通带系统中具有广泛的应用价值。第五,基于开路及短路枝节混合加载的四模闭环谐振器,设计了一款三通带带通滤波器。其中,第三通带是一个谐波响应。通过调节阶梯阻抗闭环谐振器的阻抗特性,可以将通带调节至合适的频带范围。所设计的三通带滤波器可用于5GHz的无线局域网系统。第六,研究了功率分配器。在总结了多种变型的Wilkinson和Gysel功分器的基础上,提出了一种新的组合体结构。该结构同时具有Wilkinson的宽带特性及Gysel结构的良好热传导效应。另外,基于威尔金森结构,设计了一个异相输出的两路功分器。并采用奇偶模电压法对其传输线阻抗及电长度做了详细的推导。测试结果表明,该结构能在窄带范围内,实现等功率反相输出。
[Abstract]:With the rapid development of modern wireless communication technology, new techniques and technologies emerging, microwave and millimeter wave systems is rapidly towards high performance, miniaturization, multifunction and low cost direction. Passive filter and planar power divider / combiner is used as the key device in a microwave communication system, its performance and the volume will be directly affect the working performance of the whole communication system. The research of high performance passive device miniaturization is beneficial to reduce the system volume, lighten the weight, improve the performance of the system, so it has important research value. This paper uses ladder impedance, defect, multimode resonant unit, improved Gysel and Wilkinson model, research and design of a variety of new the high performance filter and power plane passive devices etc., to improve the overall performance of microwave communication system. The main contents are summarized as follows: firstly, based on ladder resistance Anti structure, put forward two hairpin internal loading. At the same time, it is investigated that the transmission matrix and the equivalent circuit of LC. Finally, two kinds of structure using several designed with high selectivity and low pass filter with ultra wide stopband. Due to internal loading does not change the appearance size, and enhances the effect of slow wave, filter the design has great advantages in miniaturization. Secondly, we put forward a new interdigital structure (DGS) and the LC model of the equivalent electromagnetic characteristics. Compared with a traditional transmission zero defect structure, the structure can achieve three band transmission zeros, and has excellent band edge selectivity. By adjusting the cross finger size, can change the pass band characteristics. Based on this structure in the Rogers5880 design of a low pass filter, the filter is composed of stepped impedance microstrip and two DGS unit . in addition, increasing cross index, narrow passband cutoff frequency, thereby reducing the volume of filter. Based on this, a low-pass filter is a single stage seven interdigital design. Compared to other defects of low-pass filter, the designed filter has excellent band pass characteristics. Third, put forward multimode resonator structure of a short circuited stubs loaded (MMR), and its application in ultra wideband (UWB) band-pass filter design. The filter compared to the same type, the structure can get more bandwidth. In addition, a multi-mode resonator loop loading is presented. In the case of weak coupling, can observed six resonant modes and three transmission zeros. The two zeros near the passband edge, another zero in the passband. Designed a notched ultra wideband bandpass filter using the resonator, the filter has high The frequency selectivity and band suppression. Fourth, the dual band bandpass filter is proposed. A new type of stub loaded the complementary split ring resonator (CSRR), which is applied to the design of dual band bandpass filter. By adjusting the loading side size, can change the two passband between the transmission zeros of a the number, so as to enhance the flexibility of the dual band bandpass filter design. The test shows that the filter has a near passband center frequency, pass band isolation and two harmonic suppression characteristics. In addition, a cross type H dual-mode resonator is proposed, and the even odd mode analysis. To study the resonant characteristics by cascading two the resonance unit, and the introduction of additional cross coupling in the even mode, can be individually adjusted second links with the center frequency and bandwidth. In addition, also presents an open circuit load closed loop resonator, the structure has four resonant modes. Each of the two models to form a band, the two band is adjustable. Based on this structure, a design can be applied to short distance wireless communication high selective double bandpass filter. The filter proposed in this chapter with the design of flexible, and has wide application value in the modern multi band system in fifth, the four mode closed loop resonator open and short stub loaded hybrid based on the design of a three bandpass filters. The third passband is a harmonic response. By adjusting the impedance characteristics of stepped impedance loop resonator, can be adjusted to the appropriate passband frequency range. The design of the three bandpass filter can be used for the 5GHz wireless LAN system. Sixth, the power distributor. Based on the Wilkinson and Gysel power divider with many variations, puts forward a new composite structure. This structure also has Wilkinso Good heat conduction effect of broadband characteristics and Gysel structure of n. In addition, based on the Wilkinson structure, the two work designed a phase output divider. And using the parity mode voltage to the transmission line impedance and electrical length is derived in detail. The test results show that the structure can narrow range. The realization of power inverting output.

【学位授予单位】：电子科技大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN713

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