基于平面及双层耦合结构的高性能微波无源滤波器设计及实现
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摘要
本文基于各种平面/双层耦合结构,提出并研制了多种满足不同需求的新型高性能、小型化滤波器。本论文的研究成果在无线通信系统中的滤波器设计中,具有重要的应用价值。
第一章首先对现有的用于设计滤波器的各种方法以及结构进行了回顾。目前,越来越多的滤波器采用了具有耦合性高、结构紧凑、布局多样化等特点的多层耦合结构。然而,基于多层耦合结构研制的滤波器,仍然有不少问题亟待解决。
第二章系统分析了各种对称/非对称传输线耦合结构,并推导了其相应的等效网络拓扑模型。同时,归纳列举了一部分在多层耦合结构中常用的子结构单元及其等效电路模型。最后,运用传输线耦合结构理论和双层微带线/共面波导(CPW:Coplanar Waveguide)耦合结构,举例说明了传输线耦合理论在基于多层耦合结构的滤波器设计中的重要指导意义。
第三章提出了基于CPW结构设计的具有多谐振点、可控阻带带宽的裂模CPW谐振器,以及具有超宽带匹配特性的双层微带线/CPW耦合结构,设计了具有可控阻带的超宽带(UWB:Ultra-Wideband)带通滤波器。同时,基于λ/4折叠形槽线、λ/4嵌入式CPW谐振器、以及λ/4折叠形缺陷微带线等结构单元及其窄阻带特性,研制了具有可控带内双、四极窄带干扰信号抑制特性的UWB带通滤波器。
第四章研究了新型双通带滤波器的设计方法。首先提出了具有阶跃负载支线的六角阶跃谐振器(SIR:Stepped Impedance Resonator)。这种谐振器相对于传统SIR谐振器,具有独立的双模工作频率调谐机理以及多样化的匹配架构。基于该谐振器,分别设计了两种窄带、宽带双通带带通滤波器。然后,提出了具有多谐振模式的新型嵌入式螺旋微带线结构,基于该结构设计了具有低插损、小尺寸、满足无线局域网络(WLAN:Wireless Local Area Networks)双通带系统应用的双通带带通滤波器。再次,基于双层微带线/槽线耦合结构的能量传输特性分析了该结构的零点产生机制,提出了具有高选择性、7零点特性的可调双通带带通滤波器。
第五章研究了对称/非对称复合耦合结构的工作特性,并基于对称/非对称复合耦合λ/4短路微带谐振器,研制了具有宽阻带特性的滤波器。同时,研究了双层微带线/缺陷地(DGS:Defected Ground Structure)/CPW复合耦合结构的特性。基于这种新型双层耦合结构,设计出了具有小尺寸,高陡峭度,超宽阻带特性的高性能滤波器。然后,提出了具有超宽阻带特性的双层微带线/DGS耦合结构单元,并结合各种交指耦合架构,研制了具有12倍以上工作中心频率抑制的超宽阻带(抑制度大于30 dB)、较小电路尺寸的二阶、四阶带通滤波器。再次,提出了具有可调谐谐振频率、双零点特性的双层微带线/交指DGS耦合结构单元,并结合具有短路支线的交指耦合架构的窄带耦合特性和缺陷微带线结构的低辐射、高电容耦合特性,研制了具有高达420 dB/GHz以上通带选择性、3.75倍工作中心频率的宽阻带带通滤波器。最后,提出了基于新型双层微带线/互补SRR耦合谐振器,研制了一种具有高通带选择性、较宽阻带的宽带滤波器。
第六章总结了本论文的主要工作。同时,对无线通信系统中基于多层耦合结构的高性能、小型化滤波器的潜在研究和应用进行了展望。
In this dissertation, various filters design with high performance and compact size to meet different pratical application limits is proposed, based on the planar- and dual-layer- coupled schemes. These research results with high application merits are attractive for the practical filter design in the modern wireless communication systems.
In Chapter I, various methods and structures for the filter design is introduced. At present, the multi-layer-coupled schemes with the merits of high coupling effect, compact size, and various architectures are highly developed in the field of filter design. However, the filter using the multi-layer-coupled scheme remains a great challenge.
In Chapter II, the characteristics and equivalent topology network models of the various symmetric- and asymmetric-coupled transmission lines are introduced and investigated. Meanwhile, some sub-structures with equivalent circuit models in the multi-layer-coupled scheme are concluded and introduced. Finally, an example with important guiding significance of the filter design is employed, using the coupled transmission lines theory and hybrid microstrip/CPW structure.
In Chaper III, the coplanar waveguide detached-mode resonator (CPW DMR) with multiple resonances and controlled stopband bandwidth and hybrid microstrip/CPW structure are employed to propose the ultra-wideband (UWB) bandpass filter. Besides, based on the quarter wavelength (λ/4) meander slot-line,λ/4 embedded CPW resonator, andλ/4 meander defected microstrip structure (MDMS) with the narrow stopband characteristics, the UWB bandpass filter with ultra narrow dual- and quad-notches can be employed.
In Chapter IV, the methods of the novel dual-band bandpass filter are investigated. First, the stepped-impedance resonator (SIR) with the loaded stepped- impedance stub (SIS) is introduced. These resonators have the merits of independent adjusted dual- resonances and various coupled scheme, comparing to the conventional SIR. Based on this SIR with SIS, two dual-band bandpass filters with the narrow bandwidth responses and wide bandwidth responses are employed, respectively. Then, the microstrip embedded spiral-resonator (ESR) with multi-resonances is introduced. Based on the nove resonator, dual-band bandpass filters with low insertion loss, compact sizes are implemented to meet the wireless local area networks (WLAN) dual-band applicantion. Finally, based on the power transmission characteristics of the dual-layer-coupled microstrip/slot scheme, the multiple transmission zeros mechanism of the structure is investigated. And then, a dual-band bandpass filter with seven transmission zeros, high passband selectivity, and high stopband rejection level is employed.
In Chapter V, the operated characteristics of the symmetric- and asymmetric- coupled structure are investigated, and a bandpass filter with a wide stopband is employed based on the symmetric- and asymmetric-coupledλ/4 shorted resonators. Besides, the characteristic of the hybrid microstrip/DGS/CPW structure is investigated. Based on this novel scheme, the narrowband bandpass filter with compact size, high selectivity, and wide stopband is proposed to meet the bluetooth system limits. Then, a novel hybrid microstrip T-stub/DGS cell is employed. Based on the novel cells and various interdigital-coupled scheme, the second- and fourth-order filters have the merits of very wide stopband more than 12f0 with a strong rejection greater than 30 dB and relatively compact sizes. In addition, a hybrid microstrip/interdigital DGS cells with adjusted resonance and dual-transmission zeros is employed. Based on the novel cells, the narrowband coupled effect of the interdigital coupled scheme with short-stubs and the defected microstrip structre (DMS) with low radiation and high capacitance- coupling, a filter has the merits of an excellent passband selectivity more than 420 dB/GHz and the wide stopband up to 3.75 times of the operated center freuquecy is proposed. Finally, the hybrid microstrip/complementary split ring resonator (CSRR) based resonator is employed to design the wideband bandpass filter with high selectivity and relatively wide stopband.
In Chapter VI, the research on the filter design of this dissertation is concluded. Besides, the potential research and applications of the filter based on the multi-layer coupled schemes for the future wireless communication system are predicted.
第一章首先对现有的用于设计滤波器的各种方法以及结构进行了回顾。目前,越来越多的滤波器采用了具有耦合性高、结构紧凑、布局多样化等特点的多层耦合结构。然而,基于多层耦合结构研制的滤波器,仍然有不少问题亟待解决。
第二章系统分析了各种对称/非对称传输线耦合结构,并推导了其相应的等效网络拓扑模型。同时,归纳列举了一部分在多层耦合结构中常用的子结构单元及其等效电路模型。最后,运用传输线耦合结构理论和双层微带线/共面波导(CPW:Coplanar Waveguide)耦合结构,举例说明了传输线耦合理论在基于多层耦合结构的滤波器设计中的重要指导意义。
第三章提出了基于CPW结构设计的具有多谐振点、可控阻带带宽的裂模CPW谐振器,以及具有超宽带匹配特性的双层微带线/CPW耦合结构,设计了具有可控阻带的超宽带(UWB:Ultra-Wideband)带通滤波器。同时,基于λ/4折叠形槽线、λ/4嵌入式CPW谐振器、以及λ/4折叠形缺陷微带线等结构单元及其窄阻带特性,研制了具有可控带内双、四极窄带干扰信号抑制特性的UWB带通滤波器。
第四章研究了新型双通带滤波器的设计方法。首先提出了具有阶跃负载支线的六角阶跃谐振器(SIR:Stepped Impedance Resonator)。这种谐振器相对于传统SIR谐振器,具有独立的双模工作频率调谐机理以及多样化的匹配架构。基于该谐振器,分别设计了两种窄带、宽带双通带带通滤波器。然后,提出了具有多谐振模式的新型嵌入式螺旋微带线结构,基于该结构设计了具有低插损、小尺寸、满足无线局域网络(WLAN:Wireless Local Area Networks)双通带系统应用的双通带带通滤波器。再次,基于双层微带线/槽线耦合结构的能量传输特性分析了该结构的零点产生机制,提出了具有高选择性、7零点特性的可调双通带带通滤波器。
第五章研究了对称/非对称复合耦合结构的工作特性,并基于对称/非对称复合耦合λ/4短路微带谐振器,研制了具有宽阻带特性的滤波器。同时,研究了双层微带线/缺陷地(DGS:Defected Ground Structure)/CPW复合耦合结构的特性。基于这种新型双层耦合结构,设计出了具有小尺寸,高陡峭度,超宽阻带特性的高性能滤波器。然后,提出了具有超宽阻带特性的双层微带线/DGS耦合结构单元,并结合各种交指耦合架构,研制了具有12倍以上工作中心频率抑制的超宽阻带(抑制度大于30 dB)、较小电路尺寸的二阶、四阶带通滤波器。再次,提出了具有可调谐谐振频率、双零点特性的双层微带线/交指DGS耦合结构单元,并结合具有短路支线的交指耦合架构的窄带耦合特性和缺陷微带线结构的低辐射、高电容耦合特性,研制了具有高达420 dB/GHz以上通带选择性、3.75倍工作中心频率的宽阻带带通滤波器。最后,提出了基于新型双层微带线/互补SRR耦合谐振器,研制了一种具有高通带选择性、较宽阻带的宽带滤波器。
第六章总结了本论文的主要工作。同时,对无线通信系统中基于多层耦合结构的高性能、小型化滤波器的潜在研究和应用进行了展望。
In this dissertation, various filters design with high performance and compact size to meet different pratical application limits is proposed, based on the planar- and dual-layer- coupled schemes. These research results with high application merits are attractive for the practical filter design in the modern wireless communication systems.
In Chapter I, various methods and structures for the filter design is introduced. At present, the multi-layer-coupled schemes with the merits of high coupling effect, compact size, and various architectures are highly developed in the field of filter design. However, the filter using the multi-layer-coupled scheme remains a great challenge.
In Chapter II, the characteristics and equivalent topology network models of the various symmetric- and asymmetric-coupled transmission lines are introduced and investigated. Meanwhile, some sub-structures with equivalent circuit models in the multi-layer-coupled scheme are concluded and introduced. Finally, an example with important guiding significance of the filter design is employed, using the coupled transmission lines theory and hybrid microstrip/CPW structure.
In Chaper III, the coplanar waveguide detached-mode resonator (CPW DMR) with multiple resonances and controlled stopband bandwidth and hybrid microstrip/CPW structure are employed to propose the ultra-wideband (UWB) bandpass filter. Besides, based on the quarter wavelength (λ/4) meander slot-line,λ/4 embedded CPW resonator, andλ/4 meander defected microstrip structure (MDMS) with the narrow stopband characteristics, the UWB bandpass filter with ultra narrow dual- and quad-notches can be employed.
In Chapter IV, the methods of the novel dual-band bandpass filter are investigated. First, the stepped-impedance resonator (SIR) with the loaded stepped- impedance stub (SIS) is introduced. These resonators have the merits of independent adjusted dual- resonances and various coupled scheme, comparing to the conventional SIR. Based on this SIR with SIS, two dual-band bandpass filters with the narrow bandwidth responses and wide bandwidth responses are employed, respectively. Then, the microstrip embedded spiral-resonator (ESR) with multi-resonances is introduced. Based on the nove resonator, dual-band bandpass filters with low insertion loss, compact sizes are implemented to meet the wireless local area networks (WLAN) dual-band applicantion. Finally, based on the power transmission characteristics of the dual-layer-coupled microstrip/slot scheme, the multiple transmission zeros mechanism of the structure is investigated. And then, a dual-band bandpass filter with seven transmission zeros, high passband selectivity, and high stopband rejection level is employed.
In Chapter V, the operated characteristics of the symmetric- and asymmetric- coupled structure are investigated, and a bandpass filter with a wide stopband is employed based on the symmetric- and asymmetric-coupledλ/4 shorted resonators. Besides, the characteristic of the hybrid microstrip/DGS/CPW structure is investigated. Based on this novel scheme, the narrowband bandpass filter with compact size, high selectivity, and wide stopband is proposed to meet the bluetooth system limits. Then, a novel hybrid microstrip T-stub/DGS cell is employed. Based on the novel cells and various interdigital-coupled scheme, the second- and fourth-order filters have the merits of very wide stopband more than 12f0 with a strong rejection greater than 30 dB and relatively compact sizes. In addition, a hybrid microstrip/interdigital DGS cells with adjusted resonance and dual-transmission zeros is employed. Based on the novel cells, the narrowband coupled effect of the interdigital coupled scheme with short-stubs and the defected microstrip structre (DMS) with low radiation and high capacitance- coupling, a filter has the merits of an excellent passband selectivity more than 420 dB/GHz and the wide stopband up to 3.75 times of the operated center freuquecy is proposed. Finally, the hybrid microstrip/complementary split ring resonator (CSRR) based resonator is employed to design the wideband bandpass filter with high selectivity and relatively wide stopband.
In Chapter VI, the research on the filter design of this dissertation is concluded. Besides, the potential research and applications of the filter based on the multi-layer coupled schemes for the future wireless communication system are predicted.
引文
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