微带带阻和平衡滤波器研究
发布时间：2018-09-03 19:53
【摘要】：微波与射频通信技术的发展,让我们的生活更加便利。然而,这一技术面临的瓶颈是有限的频率资源与频间串扰。带阻滤波器作为一种频率选择性器件,能抑制不需要的频段,它的性能通常影响通信系统的功能。另一方面,通信系统处理过程中面临着噪声的干扰,噪声制约了信号处理过程中所能识别的最小信号电平。平衡滤波器相对于传统的单端电路而言,最明显的优势就是较强的共模抑制,使得系统免受环境噪声的干扰。在通信系统设备向着微型化、低损耗、抗噪声和集成化发展的趋势下,平衡滤波器的研究正逐渐成为一个热门课题。本文基于平面微带结构,主要研究了带阻滤波器和平衡滤波器的实现方法。本文主要创新工作内容有:(1)高选择性带阻滤波器的研究。带阻滤波器是平衡滤波器的设计基础,本文在传统枝节线带阻滤波器的基础上通过嵌入枝节引入多路径,设计宽带带阻或双频带阻滤波器。这种多路径信号干扰结构不仅具备高陡峭性,此外由于采用内嵌结构减少尺寸。(2)提出采用源负载耦合设计具四个可控传输零点的平衡带通滤波器,改善通带的选择性和共模抑制效果。(3)提出了两种改进型耦合馈线并将其运用在高选择性高共模抑制平衡带通滤波器的设计中。改进型耦合馈线是在传统耦合线的基础上,通过加载短路/开路枝节,使得滤波器在差模/共模时表现带通/带阻响应,从而实现输入端的平衡馈电。为实现更高的选择性,耦合枝节及其加载的谐振器结构也被应用在平衡滤波器设计中。(4)提出基于多层介质板的背对背结构的宽带平衡滤波器。槽线阶跃阻抗谐振器(SIR)实现强耦合,背对背的微带SIR谐振器分开差模和共模谐振频率,同时带外引入两个传输零点,实现高选择性差模通带和共模抑制。(5)研究槽线结构在平衡滤波器设计中的应用。首先提出基于槽线结构和嵌入枝节的小型化多陷波超宽带平衡滤波器,通过控制槽线谐振器的三个谐振模式和微带-槽线耦合结构,实现覆盖UWB频带的差模通带。再者,利用嵌入的枝节实现陷波,通过控制嵌入枝节的长度和偏移可以独立调节陷波频率和衰减水平。此外,提出槽线耦合馈电结构,并将其应用在多频平衡滤波器和平衡双工器中。
[Abstract]:The development of microwave and RF communication technology makes our life more convenient. However, the bottleneck of this technology is limited frequency resources and inter-frequency crosstalk. As a kind of frequency selective device, band-stop filter can suppress unnecessary frequency band, and its performance usually affects the function of communication system. On the other hand, the communication system faces the interference of noise in the process of processing, which restricts the minimum signal level that can be recognized in the process of signal processing. Compared with the traditional single-ended circuits, the most obvious advantage of the balanced filter is the strong common mode suppression, which makes the system free from environmental noise. With the development of communication system equipment towards miniaturization, low loss, anti-noise and integration, the research of balanced filter is becoming a hot topic. In this paper, based on planar microstrip structure, the realization methods of band-stop filter and balanced filter are studied. The main contents of this paper are as follows: (1) the research of high selective bandstop filter. The band-stop filter is the basis of the design of the balanced filter. Based on the traditional branch line-band-stop filter, this paper designs a wideband band-stop or dual-band band-stop filter by introducing the multi-path into the embedded branch of the band-stop filter. This multipath signal interference structure not only has high steepness, but also uses embedded structure to reduce the size. (2) A balanced bandpass filter with four controllable transmission zeros is designed by using source-load coupling. (3) two kinds of improved coupling feeders are proposed and applied to the design of high selectivity and high common mode suppression balanced bandpass filters. The improved coupling feeder is based on the traditional coupling line. By loading the short-circuit / open-circuit branch, the filter performs the band-pass / band-stop response in the differential mode / common mode, thus realizing the balanced feed at the input end. In order to achieve higher selectivity, coupled segments and their loaded resonator structures are also applied in the design of balanced filters. (4) Broadband balanced filters with back-to-back structure based on multilayer dielectric plates are proposed. The slot line step impedance resonator (SIR) realizes strong coupling. The back-to-back microstrip SIR resonator separates the differential mode from the common mode resonance frequency and introduces two transmission zeros out of the band. High selectivity differential mode pass band and common mode suppression are realized. (5) the application of slot structure in the design of balanced filter is studied. Firstly, a miniaturized multi-notch ultra-wideband balanced filter based on slot structure and embedded branch is proposed. By controlling the three resonant modes of slot resonator and the coupling structure of microstrip and slot line, the differential mode pass band covering UWB band is realized. Furthermore the notch frequency and attenuation level can be adjusted independently by controlling the length and migration of the embedded branch. In addition, the slot line coupling feed structure is proposed and applied to the multi-frequency balanced filter and balanced Duplexer.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713
本文编号：2221006
[Abstract]:The development of microwave and RF communication technology makes our life more convenient. However, the bottleneck of this technology is limited frequency resources and inter-frequency crosstalk. As a kind of frequency selective device, band-stop filter can suppress unnecessary frequency band, and its performance usually affects the function of communication system. On the other hand, the communication system faces the interference of noise in the process of processing, which restricts the minimum signal level that can be recognized in the process of signal processing. Compared with the traditional single-ended circuits, the most obvious advantage of the balanced filter is the strong common mode suppression, which makes the system free from environmental noise. With the development of communication system equipment towards miniaturization, low loss, anti-noise and integration, the research of balanced filter is becoming a hot topic. In this paper, based on planar microstrip structure, the realization methods of band-stop filter and balanced filter are studied. The main contents of this paper are as follows: (1) the research of high selective bandstop filter. The band-stop filter is the basis of the design of the balanced filter. Based on the traditional branch line-band-stop filter, this paper designs a wideband band-stop or dual-band band-stop filter by introducing the multi-path into the embedded branch of the band-stop filter. This multipath signal interference structure not only has high steepness, but also uses embedded structure to reduce the size. (2) A balanced bandpass filter with four controllable transmission zeros is designed by using source-load coupling. (3) two kinds of improved coupling feeders are proposed and applied to the design of high selectivity and high common mode suppression balanced bandpass filters. The improved coupling feeder is based on the traditional coupling line. By loading the short-circuit / open-circuit branch, the filter performs the band-pass / band-stop response in the differential mode / common mode, thus realizing the balanced feed at the input end. In order to achieve higher selectivity, coupled segments and their loaded resonator structures are also applied in the design of balanced filters. (4) Broadband balanced filters with back-to-back structure based on multilayer dielectric plates are proposed. The slot line step impedance resonator (SIR) realizes strong coupling. The back-to-back microstrip SIR resonator separates the differential mode from the common mode resonance frequency and introduces two transmission zeros out of the band. High selectivity differential mode pass band and common mode suppression are realized. (5) the application of slot structure in the design of balanced filter is studied. Firstly, a miniaturized multi-notch ultra-wideband balanced filter based on slot structure and embedded branch is proposed. By controlling the three resonant modes of slot resonator and the coupling structure of microstrip and slot line, the differential mode pass band covering UWB band is realized. Furthermore the notch frequency and attenuation level can be adjusted independently by controlling the length and migration of the embedded branch. In addition, the slot line coupling feed structure is proposed and applied to the multi-frequency balanced filter and balanced Duplexer.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713
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