电磁可调以及多层SIW滤波器研究
发布时间：2019-05-24 23:31
【摘要】：由于无线通信的迅速发展,各种通信模式及业务并存,无线通信系统对多带多模的可重构射频前端的需求日益迫切。作为可重构射频前端的核心器件之一,可调射频滤波器承担着频率选择或者抑制的重要作用。因此,研究高选择性、高可调范围以及小型化的射频滤波器具有十分重要的意义。本论文首先研究了加载变容管可调的平面滤波器,继而研究了磁可调的SIW(Substrate Integrated Waveguide)滤波器。由于收发机的带宽常常保持不变,因此在上述的可调滤波器中,我们通过常带宽机制,来保证可调过程中滤波器的绝对带宽或者分形带宽不变,提高可调滤波器的实用性,同时使得可调外设电路简化,减小整体尺寸。之后,研究了 SIW结构垂直耦合情况下的电磁耦合实现方式,在此基础上设计谐波抑制以及高选择性的紧凑型SIW滤波器。本论文主要的研究内容包括:(1)电可调带通滤波器:首先提出了单通带以及双通带常带宽可调滤波器的设计方法,并且双带滤波器的两个通带能够独立可调。其中单通带可调带通滤波器是由加载变容管的无接地谐振环实现,双通带带通滤波器是由两个双模谐振器组成,通过控制谐振器的奇偶模来选择双带选择性以及控制可调过程中的带宽。所设计的两款滤波器都具有调谐率高以及控制电路简单的特性。(2)电可调带阻滤波器:首先提出了中心频率和带宽能够独立可控的单带以及双带带阻谐振单元,然后结合紧凑型的级联结构分别实现二阶以及三阶单带带阻滤波器、双带带阻滤波器。所提出的滤波器均有中心频率和带宽独立可控,尺寸紧凑的优点。在此基础上,提出了可调带阻滤波器的设计方法,并通过对可调过程中带阻谐振单元的带宽以及耦合系数的分析,最终实现常带宽的二阶以及三阶单带可调带阻滤波器。所设计的可调带阻滤波器具有带内抑制能力高,尺寸紧凑的特点。(3)结合带阻单元的电可调带通滤波器:首先提出了三阶常带宽可调带通滤波器的设计方法,继而将带阻单元与可调带通滤波器相结合,来产生额外的传输零点来抑制出现在通带附近的强干扰信号。由于带阻单元的中心频率能够通过加载到其上的电容来灵活控制,因此产生的传输零点可以灵活控制,并且在滤波器通带调谐过程中保持不变。整体滤波器的尺寸紧凑,控制电路简单。(4)磁可调SIW滤波器:首先详细分析了不同磁偏置下铁氧体等效磁导率的变化,然后根据SIW高次模的磁场分布来选择合适的加载位置实现磁可调的工作于高次模TE202的谐振器,继而对谐振器之间的耦合结构进行合理设计,最终实现磁可调的常带宽的SIW高次模可调滤波器。该高次模可调滤波器在同等的加工工艺下能够实现较高频率的设计。(5)多层SIW带通滤波器:首先详细分析了垂直耦合状态下SIW谐振器内的电磁场分布,继而提出了基模以及高次模之间电耦合、磁耦合以及混合耦合的设计方法。在此基础上,根据垂直耦合状态下基模以及高次模耦合系数相对独立的特性,分别设计了两款谐波抑制的带通滤波器以及一款高阶交叉耦合并带有谐波抑制的带通滤波器。所提出的滤波器具有结构紧凑,带外抑制能力高以及高选择性的特点。本论文所提出的各种新型的电磁可调滤波器对研究宽调谐范围以及高选择性的可调滤波器具有一定的指导作用,而且在可调过程中都能保持常带宽特性,具有易于调控的特点。同时,本文设计的多层SIW滤波器结构紧凑,选择性以及带外抑制能力高,具有广阔的应用的前景。
[Abstract]:Due to the rapid development of wireless communication and the coexistence of various communication modes and services, the demand of the wireless communication system for multi-band multi-mode reconfigurable radio-frequency front-end is becoming more and more urgent. As one of the core components of the reconfigurable radio-frequency front-end, the tunable RF filter plays an important role in frequency selection or suppression. Therefore, it is of great significance to study the high-selectivity, high-adjustable range and the miniaturized radio-frequency filter. In this paper, the adjustable planar filter of the loading variable-volume tube is first studied, and then the magnetic adjustable SIW (Subrate Integrated) filter is also studied. since the bandwidth of the transceiver is often kept constant, in the above-mentioned tunable filter, the absolute bandwidth or the fractal bandwidth of the filter in the adjustable process is guaranteed to be unchanged through the constant-bandwidth mechanism, the practicability of the adjustable filter is improved, and the adjustable peripheral circuit is simplified, The overall size is reduced. Then, the implementation of the electromagnetic coupling in the vertical coupling of the SIW structure is studied, and the harmonic suppression and the high-selectivity compact SIW filter are designed. The main research contents of this thesis include: (1) an electrically tunable band-pass filter: firstly, a design method of a single-pass band and a double-pass band constant-bandwidth adjustable filter is proposed, and the two pass-bands of the dual-band filter can be independently adjustable. In which a single-pass band-adjustable band-pass filter is realized by a non-grounded resonant ring loaded with a varactor, the dual-pass band-pass filter is composed of two dual-mode resonators, and the dual-band selectivity is selected by controlling the parity mode of the resonator and the bandwidth in the adjustable process is controlled. Both filters are designed with a high tuning rate and a simple control circuit. (2) Electric tunable band-stop filter: First, a single band with independent and controllable center frequency and bandwidth and a double band band-stop resonance unit are proposed, and then the second order and the third order single band band-stop filter and the double-band band-stop filter can be realized in combination with the compact cascade structure. The proposed filter has the advantages of independent and controllable center frequency and bandwidth and compact size. On this basis, the design method of the adjustable band-stop filter is proposed, and the second order and the third order single-band adjustable band-stop filter with constant bandwidth are finally realized by analyzing the bandwidth and the coupling coefficient of the band-blocking resonance unit in the adjustable process. The adjustable band-stop filter has the characteristics of high in-band rejection capability and compact size. And (3) combining the band-stop unit with an adjustable band-pass filter, which comprises the following steps of: firstly, a design method of a third-order constant-bandwidth adjustable band-pass filter is proposed, and the band-blocking unit is combined with an adjustable band-pass filter to generate an extra transmission zero point to suppress the strong interference signal appearing near the pass band. Since the center frequency of the band-stop unit can be flexibly controlled by the capacitance loaded thereto, the generated transmission zeroes can be flexibly controlled and remain unchanged during the filter pass-band tuning process. The overall filter is compact in size and simple in control circuit. (4) the magnetic adjustable SIW filter: first, the change of the equivalent magnetic permeability of the ferrite under different magnetic bias is analyzed in detail, and then the proper loading position is selected according to the magnetic field distribution of the SIW high order mode to realize the magnetic adjustable resonator of the high-order mode TE202, And then the coupling structure between the resonators is reasonably designed, and finally, the adjustable filter of the SIW high-order mode with the constant bandwidth of the magnetic adjustable is realized. The high-order mode tunable filter can achieve higher frequency design under the same processing technology. (5) Multi-layer SIW band-pass filter: firstly, the electromagnetic field distribution in the SIW resonator in the vertical coupling state is analyzed in detail, and then the design method of the electrical coupling, the magnetic coupling and the hybrid coupling between the base mode and the high-order mode is proposed. On this basis, two harmonic suppression band-pass filters and a band-pass filter with high order cross-coupling and harmonic suppression are designed according to the characteristics of the fundamental mode and the high-order mode coupling coefficient in the vertical coupling state. The proposed filter has the characteristics of compact structure, high out-of-band rejection capability and high selectivity. The novel electromagnetic tunable filter proposed in this paper has a certain guiding function to the wide tuning range of the research and the tunable filter with high selectivity, and can keep the characteristic of constant bandwidth in the adjustable process, and has the characteristics of easy regulation and control. At the same time, the multi-layer SIW filter designed in this paper has the advantages of compact structure, high selectivity and high out-of-band rejection capability, and has wide application prospect.
【学位授予单位】：西南交通大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TN713
本文编号：2485283
[Abstract]:Due to the rapid development of wireless communication and the coexistence of various communication modes and services, the demand of the wireless communication system for multi-band multi-mode reconfigurable radio-frequency front-end is becoming more and more urgent. As one of the core components of the reconfigurable radio-frequency front-end, the tunable RF filter plays an important role in frequency selection or suppression. Therefore, it is of great significance to study the high-selectivity, high-adjustable range and the miniaturized radio-frequency filter. In this paper, the adjustable planar filter of the loading variable-volume tube is first studied, and then the magnetic adjustable SIW (Subrate Integrated) filter is also studied. since the bandwidth of the transceiver is often kept constant, in the above-mentioned tunable filter, the absolute bandwidth or the fractal bandwidth of the filter in the adjustable process is guaranteed to be unchanged through the constant-bandwidth mechanism, the practicability of the adjustable filter is improved, and the adjustable peripheral circuit is simplified, The overall size is reduced. Then, the implementation of the electromagnetic coupling in the vertical coupling of the SIW structure is studied, and the harmonic suppression and the high-selectivity compact SIW filter are designed. The main research contents of this thesis include: (1) an electrically tunable band-pass filter: firstly, a design method of a single-pass band and a double-pass band constant-bandwidth adjustable filter is proposed, and the two pass-bands of the dual-band filter can be independently adjustable. In which a single-pass band-adjustable band-pass filter is realized by a non-grounded resonant ring loaded with a varactor, the dual-pass band-pass filter is composed of two dual-mode resonators, and the dual-band selectivity is selected by controlling the parity mode of the resonator and the bandwidth in the adjustable process is controlled. Both filters are designed with a high tuning rate and a simple control circuit. (2) Electric tunable band-stop filter: First, a single band with independent and controllable center frequency and bandwidth and a double band band-stop resonance unit are proposed, and then the second order and the third order single band band-stop filter and the double-band band-stop filter can be realized in combination with the compact cascade structure. The proposed filter has the advantages of independent and controllable center frequency and bandwidth and compact size. On this basis, the design method of the adjustable band-stop filter is proposed, and the second order and the third order single-band adjustable band-stop filter with constant bandwidth are finally realized by analyzing the bandwidth and the coupling coefficient of the band-blocking resonance unit in the adjustable process. The adjustable band-stop filter has the characteristics of high in-band rejection capability and compact size. And (3) combining the band-stop unit with an adjustable band-pass filter, which comprises the following steps of: firstly, a design method of a third-order constant-bandwidth adjustable band-pass filter is proposed, and the band-blocking unit is combined with an adjustable band-pass filter to generate an extra transmission zero point to suppress the strong interference signal appearing near the pass band. Since the center frequency of the band-stop unit can be flexibly controlled by the capacitance loaded thereto, the generated transmission zeroes can be flexibly controlled and remain unchanged during the filter pass-band tuning process. The overall filter is compact in size and simple in control circuit. (4) the magnetic adjustable SIW filter: first, the change of the equivalent magnetic permeability of the ferrite under different magnetic bias is analyzed in detail, and then the proper loading position is selected according to the magnetic field distribution of the SIW high order mode to realize the magnetic adjustable resonator of the high-order mode TE202, And then the coupling structure between the resonators is reasonably designed, and finally, the adjustable filter of the SIW high-order mode with the constant bandwidth of the magnetic adjustable is realized. The high-order mode tunable filter can achieve higher frequency design under the same processing technology. (5) Multi-layer SIW band-pass filter: firstly, the electromagnetic field distribution in the SIW resonator in the vertical coupling state is analyzed in detail, and then the design method of the electrical coupling, the magnetic coupling and the hybrid coupling between the base mode and the high-order mode is proposed. On this basis, two harmonic suppression band-pass filters and a band-pass filter with high order cross-coupling and harmonic suppression are designed according to the characteristics of the fundamental mode and the high-order mode coupling coefficient in the vertical coupling state. The proposed filter has the characteristics of compact structure, high out-of-band rejection capability and high selectivity. The novel electromagnetic tunable filter proposed in this paper has a certain guiding function to the wide tuning range of the research and the tunable filter with high selectivity, and can keep the characteristic of constant bandwidth in the adjustable process, and has the characteristics of easy regulation and control. At the same time, the multi-layer SIW filter designed in this paper has the advantages of compact structure, high selectivity and high out-of-band rejection capability, and has wide application prospect.
【学位授予单位】：西南交通大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TN713
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