电容调谐的微带环形谐振器带通滤波器

普通的微带带通滤波器常采用λ/2或λ/4微带线谐振器作为滤波元件。这种谐振器由于射频短路点的存在,会产生寄生参量。这些寄生参量会使谐振频率不稳定,增加电路的损耗和寄生耦合等缺点,因此这种     

变容管调谐微带环形谐振器带通滤波器的研究

本文研究了变容管调谐的微带环形谐振器带通滤波器。给出了微带环形谐振器的谐振特性和两环形谐振器间的耦合特性。制作了二级变容管调谐微带环形谐振器的带通滤波器，实验结果和理论吻合较好。     

一种新型超宽带带通滤波器的设计

针对超宽带(UWB)系统易受无线网络信号干扰及传统的超宽带带通滤波器阻带较窄,不能有效抑制谐波的问题,提出了一种新型的UWB带通滤波器,该滤波器由两级交指梳状耦合谐振器级联组成,通过增加耦合指的个数来实现陷波特性,然后在两个交指谐振器的中间添加一个槽线锥形谐振器,使该滤波器具有抑制高次谐波特性,达到拓宽高阻带的效果,同时由于槽线谐振器的加入,陷波频段的抑制电平进一步提高.实验结果证明,所设计的滤波器既能保证3.1～10.6 GHz频段内的插入损耗小于3 dB,陷波频段为5.7～5.8 GHz,陷波频段的抑制电平高达-43 dB,同时又能拓宽高频阻带.     

一种新型L波段带通滤波器的设计

本文给出了一种具有平行耦合线分裂环谐振器式Ｌ波段带通滤波器的近似设计方法及实验结果。这种滤波器结构简单，宜用于微波单片集成电路。     

一种新型超宽带带通滤波器的设计

介绍一种新型的超宽带带通滤波器,研究了微带阶梯阻抗谐振器的阻抗特性,利用该并联结构实现了超宽带带通滤波器的带外传输零点。设计了一款性能较好的宽带带通滤波器,实际测试结果与仿真结果十分吻合,证明了设计方法的正确性。     

一种具有传输零点的Hairpin带通滤波器设计

本文通过在微带（hairpin）滤波器的谐振器上并联微带开路线，构成了一种新的hairpin带通滤波器。该滤波器在通带附近有一对传输零点，具有良好的频率响应以及频率选择特性。由于这种类型的微带滤波器实现传输零点不需要通过滤波器非相邻谐振器间的交叉耦合来获得，因此，设计过程非常简单。     

一种超小型带通滤波器

这里介绍一种超小型微波集成带通滤波器,它具有结构精巧、工艺简单、节省材料的优点.通带频率为2～4GHz,带外抑制可达40dB以上.用扫频仪测试,除通带部分外,在18GHz以下无寄生通带产生,带内损耗1.2dB左右,是一种值得推广应用的     

同轴腔带通滤波器的一种设计方法

采用负阻线子网络…构造了多腔耦合的同轴带通滤波器电路模型，应用电路分析软件对滤波器进行了分析优化，得到腔体之间耦合系数和接入点位置。应用三维全波分析软件，分析了腔体结构参数与耦合系数和耦合窗的关系。以这种路和场的仿真、优化相结合的方法，得出了滤波器的耦合和输入输出结构参数。运用该方法设计的中心频率2．4GHz，通带100MHz的六腔滤波器的实际测试结果与仿真分析结果基本一致。     

带有耦合电容的多层陶瓷带通滤波器

提出一种抽头式阶梯阻抗带通滤波器。通过在谐振器开路端引入耦合电容，增强了两个揩振器之间的耦合，从而使通带变宽，通带内衰减也变小了。因此，在不改变体积的情况下，性能比以前更好。文中采用时域有限差分方法分析这种滤波器。     

一种新型微带交指带通滤波器的设计

分析了四分之一波长阶跃阻抗谐振器(SIR)能够抑制寄生响应的特点和实现滤波器小型化设计的原理。利用SIR增加了设计滤波器的灵活度,实现了对L波段传统微带交指带通滤波器的改进,得到了基于SIR结构的新型微带交指带通滤波器。仿真试验结果证明:改进后的滤波器第一寄生响应向后推移1.4 GHz,整个滤波器的面积可以减少32%,该设计方法有效。     

宽阻带超宽带带通滤波器的设计

针对某些传统滤波器阻带较窄,抑制谐波性能差的缺点,对传统的阶梯阻抗谐振器( SIR)进行了改进,使之通带内回波损耗降低,频带增宽,同时利用缺陷接地结构(DGS)制谐波特性来增加阻带宽度,得到一款低插损滤波器,最后使用HFSS建模仿真.结果表明:该滤波器具有良好的通带效果,通带内插入损耗小于l dB,回波损耗大于10 d...     

Design of compact low pass filter with wide stop band using tri-section stepped impedance resonator

This paper reports the design of a compact low pass filter (LPF) with wide stop band region using tri-section stepped impedance resonators in microstrip medium. Experimental results of a low pass filter designed at 1 GHz have been compared against the analytical and EM simulation results for the validation of the design. Results are satisfactorily matching each other. The maximum insertion of the measured filter is 0.2 dB and minimum return loss is 13.5 dB over the pass band. The stop band rejection is better than 20 dB from 1.5 GHz to 4.2 GHz and hence wide stop band performance is achieved. Overall size of the filter is 30 mm × 20 mm × 0.78 mm which is 0.1λ × 0.066λ × 0.0026λ at 1 GHz.     

Dual-band bandpass filter based on mixed electric and magnetic coupling of the hybrid quasi-lumped resonator

A novel compact dual-band bandpass filter based on mixed coupling of the hybrid quasi-lumped resonator is proposed. The filter is composed of two independent signal paths, each can generate one passband with two identical hybrid quasi-lumped resonators. The proposal combines the mixed electric and magnetic coupling technology with this novel resonator in the filter design. Analysis of the filter has been done with the equivalent circuit method. To validate the approach, a dual-band bandpass filter operating at 2.4/5.2 GHz has been fabricated. Both passbands were realised with mixed coupling. An additional transmission zero is generated at either passband. Final fabricated filter has good band skirt, low insertion loss and good out-of-band performance. Reasonable agreement is found between the calculated, simulated and measured results. The implementation area is 0.21λ_g × 0.12λ_g.     

Performance analysis of a low power low noise tunable band pass filter for multiband RF front end

This paper presents a low power tunable active inductor and RF band pass filter suitable for multiband RF front end circuits. The active inductor circuit uses the PMOS cascode structure as the negative transconductor of a gyrator to reduce the noise voltage. Also, this structure provides possible negative resistance to reduce the inductor loss with wide inductive bandwidth and high resonance frequency. The RF band pass filter is realized using the proposed active inductor with suitable input and output buffer stages. The tuning of the center frequency for multiband operation is achieved through the controllable current source. The designed active inductor and RF band pass filter are simulated in 180 nm and 45 nm CMOS process using the Synopsys HSPICE simulation tool and their performances are compared. The parameters, such as resonance frequency, tuning capability, noise and power dissipation, are analyzed for these CMOS technologies and discussed. The design of a third order band pass filter using an active inductor is also presented.     

X波段SICL小型化带通滤波器的设计

为有效减小X波段滤波器的尺寸,减小通带损耗,对基片集成同轴线(SICL)结构进行了研究,提出一种阶跃阻抗(SIR)型SICL带通滤波器,并针对SICL谐振腔与其他平面电路的连接设计了一种由共面波导(CPW)向SICL谐振腔提供激励的平面结构,以便滤波器的测量。仿真结果表明,滤波器通带特性优异,其中心频率为10 GHz,带宽为1.5 GHz,尺寸为13 mm×7 mm,插入损耗为-0.8 dB。     

一种新颖的开口环地面缺陷结构低通滤波器

提出了一种新颖的具有陡峭边带和宽阻带的小型化低通滤波器.通过把开口谐振环地面缺陷结构(Split-Ring Resonator Defected Ground Structure,SRR DGS)与阶梯阻抗梳状谐振器结合,提高了滤波器的选择特性,同时获得了宽阻带.对所提出的结构作了加工并进行了实物测量,测试结果表明:滤波器选择特性大于160 dB/GHz,在2.98 GHz到8.2 GHz范围内抑制度大于20 dB,而占用面积仅为20×25 mm~2.     

A new method of symmetric dual-band bandpass filter coupling matrix synthesis

A coupling matrix synthesised approach for symmetric dual-band bandpass filter is presented in this article. The dual-band filter is viewed as a single-band filter with a transmission zero inside the pass-band. Separately considering the odd and even order of each single filter that composed symmetric dual-band bandpass filter, the corresponding transmission function is shown by analysing an additional transmission zero produced. Finally, a simulation example is used to verify the correctness of the theory.     

基于微带SIR的单环及双环双模滤波器设计

采用阶跃阻抗方环代替传统的均匀阻抗方环结构,设计一种基于阶跃阻抗谐振器的微带双模滤波器。为增强滤波器的带外抑制和谐渡抑制特性,将双模滤波器从单环结构扩展到双环,两环之间通过偏馈微带线耦合。通过一个中心频率为2．5GHz、带宽约300MHz的滤波器设计和仿真,证实了基于SIR的方环双模滤波器不但具有尺寸上的优势,而且能通过级联获得传输零点多、带外抑制高、谐波抑制好的优点。     

Design and analysis of multi-channel drop filter using dual L defected hexagonal photonic crystal ring resonator

In this paper, dual L defected hexagonal Photonic Crystal Ring Resonator (PCRR) using Channel Drop Filter (CDF) is designed for Coarse Wavelength Division Multiplexing (CWDM) systems. In this structure, the external rods of the ring resonator are arranged in a hexagon and the internal rods are removed in L arrangement for introducing defects. Scatter rods are used to prevent leakage. By using the L defected hexagonal resonator, a multi-channel CDF is designed, which exhibits multiple wavelengths of CWDM (1500 nm–1600 nm) region. In addition, the selection of rod size and the position of rods in the proposed multi-channel CDF are validated by varying the radius of coupling and scattering rods, as well as the position of resonators, respectively. By using plane wave expansion and opti Finite Difference Time Domain (FDTD) method, the electromagnetic wave propagation and the photonic band gap are obtained.     

DWDM窄带滤光片膜层的误差分析与监控策略

为了提高密集波分复用(DWDM)薄膜窄带滤光片制备的成品率,讨论了用于DWDM薄膜窄带滤光片在镀制过程中的监控方法及误差,采用Monte Carlo允差分析原理分析用于DWDM窄带滤光片膜层的容差,以便选择更易制备的膜系;计算膜层的Mac leod极值灵敏度,得到所选膜系各个膜层的误差要求;模拟光学监控过程和计算膜层导纳,能够得到膜层制备过程中膜层之间膜厚的补偿关系。实验表明,据此制定的膜厚监控策略,对于DWDM窄带滤光片膜层的制备和保证成品率是非常关键的。