无线通信系统中高选择性小型化带通滤波器的研究与设计
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摘要
现代无线通信,尤其是卫星通信和移动通信,对通道的选择性要求比较高。对器件小型化、微型化的要求也越来越迫切。因此小型化、高选择性是当前滤波器研究的热点。本文根据现实需求,紧紧围绕“高选择性、小型化”两个课题展开,深入地研究了实现高选择性和小型化的新技术和新结构。主要内容如下:
(1)首先研究了利用边带优化的方法综合准椭圆函数和广义Chebyshev函数滤波器,实现滤波器的阶数最小化,选择性最大化。
(2)提出了含源-负载交叉耦合滤波器的低通等效电路模型,给出了这种结构的传输函数t (s)以及矩阵的综合方法。由含源-负载交叉耦合二端口网络的短路导纳矩阵推导了耦合矩阵M中M SL, M Si和M iL的一般表达式。最后,设计了两种结构新颖的小型化六边形微带滤波器,分别是两腔(同步调谐)和三腔(异步调谐)源-负载耦合交叉耦合滤波器。
(3)研究了三种结构的传输线滤波器产生零点的条件,即对称与斜对称串行传输线滤波器、对称与斜对称平行耦合线滤波器以及斜对称耦合的发夹型滤波器,分析了它们产生传输零点的原因、个数和位置。设计了四种具有多传输零点的微带滤波器,提高了滤波器的选择性。
(4)重点研究了三种DGS(倒“S”型、发夹型、“凹”型)耦合线滤波器的超宽带特性以及这三种DGS传输线滤波器的低通特性,根据它们的这些特点,设计了多个具有高选择性的小型化超宽带滤波器。
(5)首次通过对TEM波作用下SRR双各向异性介质的解析分析,揭示了虚波数引起SRR结构谐振特性的事实,对相对于入射波六种不同摆向的SRR结构谐振响应做出了统一的物理解释。并设计了新颖的SRR多层小型化高选择性滤波器。
The characteristics of compact size, high selectivity, and low insertion loss for modern microwave filters are highly required in the modern mobile and satellite communication systems. So miniaturized and highly selective filter is currently a research hotpoint. Based on the real demand, the new technology and new structure of miniaturized and highly selective filter are analyzed thoroughly in this thesis. The dissertation is classified into five parts stated as follows.
Firstly, novel and exact methods are presented for maximizing the band-edge selectivity of the quasi-elliptic function and general Chebyshev function filters. The technology satisfactorily resolves maximizing the BES with the least order n .
Secondly, A general method is presented for synthesizing microwave filter with source-load cross coupling. The equivalent circuit of the low-pass prototype of a general lossless coupled resonator filter is proposed, and the corresponding transfer function t(s) is derived. The expressions of M SL, M Siand M iLin the coupling matrix M are obtained based on two-port admittance matrix [ Y N]. Then, two novel hexagonal open-loop quasi-elliptic resonator microstrip filters are designed, one symmetric and the other asymmetric, are designed.
Thirdly,transmission zero conditions of three types of different coupled lines are analyzed, which areλ/2 serial microstrip lines using skew-symmetric and symmetric feed structure,λ/2 parallel coupled microstrip lines using skew-symmetric and symmetric feed structure, andλ/2 hairpin resonators using skew-symmetric feed structure. the number and Principles, location of transmission zeros are discussed, and then these structures are applied to the design of microstrip filters with multiple transmission zeroes.
Fourthly, ultra wideband characteristics of three types of coupled line filters with different defected ground structure are studied, and lowpass characteristics of three types of transmission line filters with different defected ground structure are analyzed, and then these structures are applied to the design of ultra wideband filters with transmission zeroes.
Finally, Through analysis of bianisotropic split ring resonator (SRR) metamaterials, the uniform physical explanation for SRR resonance band gaps is gained by revealing the fact that imaginary wave number does lead to the SRR resonance. The magnetic resonance of SRRs has been explained particularly and comprehensively. Meanwhile, a novel compact multilayer filter, which is based upon the small size of SRR, the skew-symmetric feed scheme and the multilayer technology, is proposed.
(1)首先研究了利用边带优化的方法综合准椭圆函数和广义Chebyshev函数滤波器,实现滤波器的阶数最小化,选择性最大化。
(2)提出了含源-负载交叉耦合滤波器的低通等效电路模型,给出了这种结构的传输函数t (s)以及矩阵的综合方法。由含源-负载交叉耦合二端口网络的短路导纳矩阵推导了耦合矩阵M中M SL, M Si和M iL的一般表达式。最后,设计了两种结构新颖的小型化六边形微带滤波器,分别是两腔(同步调谐)和三腔(异步调谐)源-负载耦合交叉耦合滤波器。
(3)研究了三种结构的传输线滤波器产生零点的条件,即对称与斜对称串行传输线滤波器、对称与斜对称平行耦合线滤波器以及斜对称耦合的发夹型滤波器,分析了它们产生传输零点的原因、个数和位置。设计了四种具有多传输零点的微带滤波器,提高了滤波器的选择性。
(4)重点研究了三种DGS(倒“S”型、发夹型、“凹”型)耦合线滤波器的超宽带特性以及这三种DGS传输线滤波器的低通特性,根据它们的这些特点,设计了多个具有高选择性的小型化超宽带滤波器。
(5)首次通过对TEM波作用下SRR双各向异性介质的解析分析,揭示了虚波数引起SRR结构谐振特性的事实,对相对于入射波六种不同摆向的SRR结构谐振响应做出了统一的物理解释。并设计了新颖的SRR多层小型化高选择性滤波器。
The characteristics of compact size, high selectivity, and low insertion loss for modern microwave filters are highly required in the modern mobile and satellite communication systems. So miniaturized and highly selective filter is currently a research hotpoint. Based on the real demand, the new technology and new structure of miniaturized and highly selective filter are analyzed thoroughly in this thesis. The dissertation is classified into five parts stated as follows.
Firstly, novel and exact methods are presented for maximizing the band-edge selectivity of the quasi-elliptic function and general Chebyshev function filters. The technology satisfactorily resolves maximizing the BES with the least order n .
Secondly, A general method is presented for synthesizing microwave filter with source-load cross coupling. The equivalent circuit of the low-pass prototype of a general lossless coupled resonator filter is proposed, and the corresponding transfer function t(s) is derived. The expressions of M SL, M Siand M iLin the coupling matrix M are obtained based on two-port admittance matrix [ Y N]. Then, two novel hexagonal open-loop quasi-elliptic resonator microstrip filters are designed, one symmetric and the other asymmetric, are designed.
Thirdly,transmission zero conditions of three types of different coupled lines are analyzed, which areλ/2 serial microstrip lines using skew-symmetric and symmetric feed structure,λ/2 parallel coupled microstrip lines using skew-symmetric and symmetric feed structure, andλ/2 hairpin resonators using skew-symmetric feed structure. the number and Principles, location of transmission zeros are discussed, and then these structures are applied to the design of microstrip filters with multiple transmission zeroes.
Fourthly, ultra wideband characteristics of three types of coupled line filters with different defected ground structure are studied, and lowpass characteristics of three types of transmission line filters with different defected ground structure are analyzed, and then these structures are applied to the design of ultra wideband filters with transmission zeroes.
Finally, Through analysis of bianisotropic split ring resonator (SRR) metamaterials, the uniform physical explanation for SRR resonance band gaps is gained by revealing the fact that imaginary wave number does lead to the SRR resonance. The magnetic resonance of SRRs has been explained particularly and comprehensively. Meanwhile, a novel compact multilayer filter, which is based upon the small size of SRR, the skew-symmetric feed scheme and the multilayer technology, is proposed.
引文
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