微带阶跃阻抗谐振器小型化滤波器的精确设计

采用具有内部耦合的微带阶跃阻抗谐振器实现小型化,借助电磁场全波分析软件,拟合出了谐振器的级间耦合系数k和外部Q值与谐振器结构的关系曲线,得出了滤波器的物理结构,实际设计制作了一个中心频率为1.52 GHz的带通滤波器,并对滤波器传输特性进行了实测。     

交叉耦合介质谐振腔滤波器

论述了TE01模介质谐振腔滤波器的设计方法。主要分析了介质谐振腔的设计、谐振腔之间的耦合,包括电耦合与磁耦合的实现。为了使TE01模滤波器与其它高Q值的滤波器具有可比性,采用交叉耦合来实现高性能滤波特性。仿真设计了一个6阶准椭圆函数滤波器,4个传输零点对称的分布在通带两侧,实现了较好的带外抑制。最后设计了一个同轴腔与介质谐振器混合耦合的滤波器,用来抑制介质滤波器寄生通带的影响。     

基于分裂式拓扑的介质波导三通带带通滤波器北大核心CSCD

本文提出了一种基于分裂式拓扑结构的介质波导三通带带通滤波器。本文所提出的三通带滤波器由两个正方形单模谐振器分别悬挂一个双模谐振器组成，单模谐振器采用TM110模式，双模谐振器采用TM120和TM210模式。第一和第三通带的频率可以由正方形单模谐振器和双模谐振器的之间的耦合控制。在双模谐振器对角线位置加入两个关于中心对称分布的金属盲孔来扰动相互简并的两个模式TM120和TM210，使两个模式频率分离并均能与单模谐振器中的TM110模式耦合。为了验证该设计，本文设计并仿真了一款中心频率分别为1.66GHz、1.72GHz和1.77GHz的三通带滤波器，仿真结果验证了设计方法的正确性和可靠性。     

基于多层技术双通带Chebyshev滤波器综合设计

为了提高滤波器的选择性,实现小型化,采用多层板技术综合方法设计了一款双通带Chebyshev响应带通滤波器.利用组成上通带的半波长开环谐振器的空间交叉耦合引入两个有限频率传输零点,以提高滤波器频率选择性.同时,利用组成下通带的四分之一波长短路谐振器形成零度馈电混合耦合结构,生成另外两个传输零点,不但提高了通带隔离度,而...     

异构耦合谐振器耦合系数的提取

为寻找异构耦合谐振器耦合系数提取电路的设计原则,本文将提取同构耦合谐振器耦合系数的电路模型一般化,在电路仿真软件中分析其各项参数变化对特征频率的影响方式,从中总结异构耦合谐振器耦合系数提取电路的设计原则与注意要点。设计了一对特定异构耦合谐振器耦合系数的提取电路,通过其提取的耦合系数在一个双频带带通滤波器设计中发挥了重要...     

微带双模带阻滤波器

滤波器的小型化是滤波器设计中的一项重要技术.采用微带线双模谐振器设计的带阻滤波器,因双模谐振器的双模谐振效应,不但可以减少谐振器的数目,同时还可以省去λ/4波长传输线,从而在很大程度上减小了滤波器的体积.采用耦合矩阵设计带阻滤波器的方法,结合实际工程需要设计并实现了一个采用双模微带线谐振器的带阻滤波器.实测结果与理论推导取得了很好的一致,验证了设计方法的可行性和方便、快捷、准确的特点.     

高选择性吸收式可调带阻滤波器的研究

该研究利用耦合相消原理设计了一种吸收式可调带阻滤波器.在传统耦合相消结构的基础上,提出了一种新的结构,通过增加耦合结构的阶数以及增大耦合支路中谐振器的电长度,使得滤波器阻带特性的Q值增大,从而提高了滤波器的选择性.通过调节加载在谐振器上变容二极管的偏置电压,实现滤波器带阻中心频率可调.并对实测结果和仿真结果进行了探讨.     

900 MHz独块同轴微波介质滤波器的仿真

采用HFSS软件讨论介质滤波器耦合(包括谐振器间的互耦合以及谐振器与外电路的耦合)性能以及中间谐振器谐振长度与其频率的相互关系,得到滤波器外界品质因数与其输入输出端口大小、滤波器级间耦合系数与其耦合孔直径以及中间谐振器谐振长度与其频率之间相互关系曲线,并以此确定所设计的介质谐振器滤波器结构尺寸。根据讨论结果,最终设计出的滤波器性能指标为:中心频率899.5MHz,带宽14MHz,带内波动0.8dB,通带损耗1.5dB,性能满足移动通讯要求。     

基于奇偶模分析法的四模谐振器结构的双通带带通滤波器设计

提出了一款基于四模谐振器的新型双通带带通滤波器.设计的四模谐振器基于微带线结构,由四个开路枝节和一个短路枝节组成.两次采用奇偶模分析法对该四模谐振器结构进行分析.该四模谐振器的每个模式能够实现独立调节,同时每两个模式形成一个通带.采用源与负载耦合的馈电方式,提高滤波器的带外抑制性.该滤波器具有四个传输零点和四个传输极点.测试结果表明,该双模双通带滤波器工作于2.08GHz和6.07GHz,3dB带宽分别为11.06%和7.74%.设计的滤波器具有紧凑的结构,只有0.28λ_g×0.11λ_g大小.     

一种利用环形双模谐振器实现的带阻滤波器

提出了一种利用双模环形谐振器实现的带阻滤波器。该滤波器由一个对称的双模环形谐振器以及一段四分之一波长的平行耦合线组成。借助于在普通环形谐振器的两个相对边上添加一对小贴片,环形谐振器的两个简并谐振模式可以被可控的分离,从而可以构成带阻滤波器的工作频带。平行耦合线的作用是为了对双模谐振器进行馈电,同时也被用做两端口间的阻抗变换器。在理论分析之后,利用平面PCB工艺设计制作了滤波器样品,并对其进行了测量,进一步证明这种设计的有效性。     

Coupling Coefficient Between Microstrip Line and Dielectric Resonator

A formula of the coupling coefficient between a dielectric resonator and a microstrip line is derived from an analysis of the transmission characteristics of the microstrip line coupled to the dielectric resonator. A practical method of calculation is developed using Fourier analysis. The calculated values show good agreement with the experimental values.     

The Microstrip Double-Ring Resonator (Short Papers)

The resonance frequencies and the fields of a microstrip double-ring resonator are discussed. It is shown that no pure even or odd mode can be excited on the resonator. Therefore it is concluded that the rnicrostrip double-ring resonator principally cannot be used to measure the phase velocities of the even and the odd modes on a coupled microstrip line.     

一种双通带微带滤波器的设计

设计了由两个H-谐振器以边缘耦合方式组成的双通带滤波器。在两条平行微带线之间桥接一条微带线,构成一个双频谐振器。随着馈电位置与中间微带线间距的增大,双频谐振器的两个外部品质因数呈相反的趋势变化。随着两个谐振器间距的增大,双频谐振器间对应的两个耦合系数逐渐减小。由此特性,将两个谐振器组合可构成双通带滤波器。     

Systematic evaluation and analysis for 60-GHz dielectric resonatorscoupled to a microstrip line on a GaAs substrate

This paper presents the first systematic evaluation and analysis of 60-GHz-band TE_01δ-mode cylindrical dielectric resonators coupled to a microstrip line on a GaAs substrate. The loss components of the unloaded Q are analyzed using simple numerical techniques. The distance between the resonator center and the microstrip line which gives the maximum coupling coefficient is found to be approximately 3/5 of the resonator radius, whose ratio is almost constant for all practical cases. The temperature characteristics are also demonstrated and the origins of temperature dependences of the unloaded Q and the coupling coefficient are discussed. An equivalent circuit model for the dielectric resonator coupled to the microstrip line is presented, whose element parameters can express the dependences of the resonant frequency, the unloaded Q, and the coupling coefficient on the structural parameters and the temperature     

Compact Dual-Band Filter Using Defected Stepped Impedance Resonator

This letter presents a novel approach for designing a dual-band bandpass filter by using defected stepped impedance resonator (DSIR). The resonant frequency of the DSIR is found to be much lower than that of the conventional microstrip stepped impedance resonator (SIR), which reduces the circuit size effectively. Two types of second-order DSIR microstrip bandpass filter operating at 1.85 and 2.35 GHz, respectively, are well designed according to the classical theory of coupled resonator filter. Then they are combined to construct a compact dual-band filter with a common parallel microstrip feed line, the measurement results of the fabricated filter have a good agreement with the simulation.     

基于折叠型SIR 谐振器的双通带滤波器设计

文中提出了一种基于折叠型SIR 谐振器的双通带频率可控的微带滤波器,它由SIR 谐振器特性结合 传输线理论实现。该滤波器设计为具有两个自由度,调节谐振器的导带宽度可以对两个通带之间的频率及其间隔 进行调节。文中还研究了调整谐振器导带长度对滤波器频率特性的影响。测试结果表明,该微带滤波器有两个通 带,其中心频率分别为2. 79 GHz 和3. 90 GHz,带内最小插入损耗分别为-0. 96 dB 和-3. 0 dB,带内最小回波损耗分 别为-42 dB 和-18 dB,相对带宽分别为5. 7%和6. 7%。仿真和测试结果的一致性证实了滤波器设计的有效性。     

A novel microstrip dual-mode bandpass filter with harmonic suppression

A novel dual-mode microstrip bandpass filter (BPF) with harmonic suppression is presented in this letter. The filter is composed of a perturbed square-ring resonator and two end-open L-shaped microstrip lines for the input and output of the resonator. The harmonic suppression of the BPF may be realized by choosing a proper length for the L-shaped microstrip line. The BPF has been investigated numerically and experimentally. Measured results show that the stop-band of the filter is increased up to near the third-order harmonic of the square-ring resonator due to harmonic suppression, and the rejection level is kept below -27dB.     

Compact microstrip bandpass filter with two transmission zeros

A novel compact microstrip bandpass filter is proposed using a half-wavelength (/spl lambda//2) microstrip line resonator and an end-coupling resonator. The filter has two transmission zeros at both low and high rejection bands, as well as low insertion loss and compact design by giving two paths to the input signals. A demonstration filter has been designed and tested. Theoretical and experimental results are presented.     

Notched stripline resonator

A new type of stripline resonator is introduced. This is a compact microstrip resonator separated by a pair of notches from the feeder line. The width of the resonator is equal to, or smaller than, the feeder line. The resonator is suitable for d.c. biasing for various applications.