无线通信中的平面滤波电路与器件关键技术研究

发布时间：2018-03-17 19:09

本文选题：带通滤波器　切入点：复合左右手　出处：《电子科技大学》2017年博士论文　论文类型：学位论文

【摘要】：目前,无线通信的信道资源非常紧张,在一个信道当中时常会同时传输多路信号。为了避免信号之间互相干扰,滤波器的作用尤其重要。从易于集成的角度来考虑,希望滤波器具有平面化的结构和紧凑的尺寸,与此同时,多频段多制式的无线通信也对滤波器提出了性能方面的更多要求。本论文以设计高性能、小型化的平面带通滤波器为目的,结合枝节结构、复合左右手(CRLH)结构对滤波器的设计方法进行了研究和探讨,所做的主要工作和创新如下:1.设计了一款工作于2.4GHz、3.5GHz、5.15 GHz的三频带带通滤波器,两组对称面上加载了枝节的谐振器被分别置于馈线上下两侧,形成了横向结构,便于单独调整。改变谐振器和枝节的尺寸参数均可实现对频带的调节,提高了设计自由度。引入了源负载耦合增强了频率选择性,引入了交指电容实现了内部耦合的调节,采用了奇偶模理论对滤波器结构进行了分解,简化了分析流程。2.对加载双枝节的阶跃阻抗谐振器(SIR)进行了研究,建立了它在两个频带内的等效电路模型,分析了不同阻抗比例对谐振频率分布的影响,结合全波仿真阐述了在两个频带内单独调整外部品质因数和耦合系数的方法。设计了一款工作于2.45GHz和5.35GHz的双频带带通滤波器,在不增加任何附加网络,不明显增加电路面积的前提下实现了参数的准确调节。3.在中心频率为1.65GHz的带通滤波器设计中采用半波长旁路枝节(bypass stub),引入了源负载耦合。通过调节枝节的尺寸在通带两侧产生了一对传输零点。引入了缺陷地结构(DGS)产生了第三个传输零点,在保证了电路结构紧凑的前提下,极大改善了滤波器的带外抑制度和频率选择性。滤波器实物尺寸仅为0.29λg×0.26λg,在3GHz到4GHz范围的阻带抑制度优于50dB。4.通过在基片集成波导(SIW)结构中加载互补开口环谐振器(CSRR)构成了双频带带通滤波器,其中低频通带位于SIW的截止频率以下,是基于SIW的消逝模产生的,有效减小了电路的尺寸。在CSRR的两侧蚀刻了DGS结构,增强了两个通带之间的隔离度。滤波器实物尺寸仅为0.59λg×0.51λg,两个通带的3dB相对带宽分别为17.4%和54.9%,具有明显的CRLH结构左右手通带的特征,插入损耗分别为0.9dB和1.2dB,综合性能表现优秀。5.利用双负单元(DNGC)设计了一款中心频率为1GHz的“准平面”窄带带通滤波器,DNGC当中包含的螺旋谐振器具有混旋结构,该结构非常适合小型化加工而且对品质因数几乎没有任何影响。对电路结构进行了详细分析,建立了分布参数模型和集总参数模型并完成了相关参数的提取。通过加载短路枝节进一步改善了滤波器的带外抑制度。滤波器实物窄带特性较好,3dB相对带宽仅为2.2%,长度尺寸仅为0.17λg,与工作于同频率的CSRR结构滤波器相比尺寸缩减了60%。6.基于缺陷微带结构谐振器(DMSR)设计了小型化超宽带(UWB)带通滤波器,通过加载交指并联耦合线(IPCL)和CSRR改善了滤波器的选频性能和带外抑制性能。滤波器实物尺寸相当紧凑,大小仅为0.51λg×0.12λg,3dB相对带宽达到了129%。进一步改良之后,选择性得到了极大改善,3dB相对带宽达到了133%,而尺寸仅略有增大(0.97λg×0.32λg)。
[Abstract]:At present, the wireless communication channel resource is very tense, in a channel which often transmit multiple signals at the same time. In order to avoid mutual interference between signals, the filter is especially important. From the integrated perspective, hope filter structure with planarized and compact size, at the same time, multi band multi-mode wireless communication also put forward more requirements on the performance of the filter. In this paper, the design of high performance, small planar bandpass filter for the purpose, with minor structure, CRLH (CRLH) design method of filter structure are studied and discussed, the main work and innovation are as follows: 1. design a workingwithin 2.4GHz, 3.5GHz 5.15 GHz tri band bandpass filter, two groups of symmetrical plane loaded stub resonators are respectively arranged on the feeder on both sides, forming a horizontal structure, easy to Adjust separately. Size parameters can be changed to realize the regulation of the resonator and side band, improve the design degrees of freedom. The source load coupling enhances the frequency selective introduction of interdigital capacitor realizes adjusting the internal coupling, the parity mode theory of filter structure decomposition, simplifies the analysis process of.2. loading double side stepped impedance resonator (SIR) was studied, established its equivalent circuit in two band model, analyzes the different influence on the resonant frequency impedance ratio distribution, combined with the full wave simulation method is introduced to adjust the external quality factor and the coupling coefficient separately in the two band of the dual band design. A work in 2.45GHz and 5.35GHz band bandpass filter, without any additional network, accurate regulation of.3. in the heart does not increase the frequency of circuit area under the premise to achieve the parameters of the The rate of 1.65GHz by half wavelength bandpass filter design side bypass (bypass stub), is introduced. By adjusting the source load coupling stub size in the passband on both sides of a pair of transmission zeros. The defected ground structure (DGS) has third transmission zeros, in ensuring the premise of compact circuit structure under greatly improved filter band suppression and frequency selective filter. The real size of only 0.29 x 0.26 X G x g to 4GHz, stopband suppression is better than 50dB.4. in the substrate integrated waveguide in 3GHz (SIW) structure loaded with complementary split ring resonators (CSRR) constitute a dual band the band-pass filter, the low frequency band is located at SIW below the cutoff frequency of the SIW, is based on evanescent mode, effectively reduce the circuit size. On both sides of the etching of CSRR DGS structure, enhanced the two passband between isolation filters. The size of only 0.59 X G x 0.51 x g, two passband 3dB relative bandwidth of 17.4% and 54.9%, with CRLH structure was the right hand pass band characteristics, insertion loss were 0.9dB and 1.2dB, a comprehensive excellent performance by using.5. double negative unit (DNGC) to design a center frequency 1GHz quasi planar band-pass filter, DNGC spiral resonator has mixed spin structure, the structure is very suitable for processing small and almost has no effect on the quality factor. The structure of the circuit is analyzed in detail, the establishment of the extraction distribution parameter model and the lumped parameter model and relevant parameters. By loading the short stubs to further improve the filter band suppression. Good physical properties of narrow band filter, the relative bandwidth is only 2.2% 3dB, the length is only 0.17 x g, CSRR structure filter and is working on the same frequency Compared with the size reduction of 60%.6. resonator defected microstrip structure (DMSR) based on the design of miniaturized ultra wideband (UWB) band-pass filter, by loading the interdigital parallel coupled line (IPCL) and CSRR to improve the performance of selective frequency and band rejection filter performance. When the real size is compact, size is only 0.51 X G x 0.12 x g, 3dB relative bandwidth reached 129%. further improved, the selectivity was greatly improved, the relative bandwidth of 3dB reached 133%, while the size is only slightly increased (0.97 X G x 0.32 x g).

【学位授予单位】：电子科技大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TN713;TN92

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