多带外传输零点微带带通滤波器设计

设计了一种梳状微带平行耦合线窄带带通滤波器,仅应用两腔结构就实现了带外5个传输零点.通过微带线开路枝节,平行耦合线结构,以及馈电位置和两个梳状线谐振器之间的耦合,在通带附近引入了3个传输零点;四分之一波长平行耦合线接地短路结构,在带外高频产生额外两个传输零点,进而可有效抑制零点频率附近的杂波干扰.实测结果表明,设计的滤...     

一种新型传输零点可控的微带带通滤波器

提出了一种新型的传输零点可控的微带带通滤波器结构,它由一段低阻抗线和与之相连的平行耦合线构成。通过调节低阻抗线与平行耦合线的偶模阻抗比,可以改变谐振器的2个模式之间的距离,从而灵活的调节滤波器的带宽;而通过调节平行耦合线的间距,则可以方便的调节传输零点的位置。仿真与实测结果都表明该滤波器具有良好的性能：低插损,结构紧凑,可以灵活的调节带宽和传输零点的位置。     

具有多传输零点的微波陶瓷滤波器设计

低温共烧陶瓷(LTCC)滤波器具有体积小、插损小和衰减大的特性,为了抑制其阻带信号,研究并设计了具有带外多个传输零点的多层LTCC带通滤波器,分析了传输零点对滤波器性能的影响.最后利用HFSS仿真软件设计了一个具有三级耦合谐振器、尺寸为2.5 mm×2.0 mm×0.9mm、中心频率为2.45 GHz的带通滤波器.仿真...     

微带交叉耦合滤波器的简化设计

主要研究微带交叉耦合滤波器的简化设计。通过约束传输零点之间的关系,简化了带通滤波器交差耦合的拓扑结构,同时又较好保持了带通滤波器带外的抑制能力。在利用微带结构实现时,采用了谐振器顺序耦合的结构,降低了滤波器微调的难度。同时在第一和第四谐振器间增加一段传输线以引入交叉耦合,通过调整引入传输线的位置等可调整相应传输零点的位置,增加了滤波器设计的灵活性。仿真结果验证了相关方法的有效性。     

具有辐射零点的高性能WiMAX频段微带滤波天线设计

本文基于滤波器综合方法,设计了一款工作在WiMAX频段的的高性能微带滤波天线。通过在谐振器之间引入电磁混合耦合,使得滤波天线的增益曲线在高频带出现了辐射零点,从而使得滤波天线具有良好的带外抑制特性。     

供3G无线应用的超高选择性HTS带通滤波器

本文介绍了一种能满足现有3G(第三代)无线频带应用的超高选择性HTS滤波器。该滤波器由22个谐振器和5个能在频带边缘产生10个传输零点的交叉耦合结构组成。为了实现传输零点，设计中我们引入了四重线交叉耦合技术。为了在有限的薄膜尺寸内容纳22个谐振器，我们研制了一种新型紧凑的谐振器拓朴结构。该滤波器使用两英寸MgO衬底的YBCO薄膜制备而成。已测得频带边缘陡度超过30dB／100KHz。该滤波器离带边350KHz有90dB的带外抑制。该滤波器的抑制水平超过了理想的50-极契比雪夫滤波器的抑制。     

一种高抑制小型化带通滤波器

该文提出了一种具有3个传输零点的高带外抑制小型化带通滤波器。通过耦合控制可在梳状线滤波器响应中引入3个传输零点。通过源/负载耦合和传输线上刻蚀的马刺线可降低带外抑制,使滤波器获得更好的性能。设计并制作了一款小型化带通滤波器实物,仿真结果表明,该文设计的滤波器工作中心频率和相对带宽分别为2.12 GHz和20%,该滤波器的回波损耗优于40 dB,插入损耗小于0.2 dB,带外抑制小于40 dB。此外,该滤波器还具有结构简单紧凑、易加工等特点,实物测试结果与仿真结果基本一致。     

X 波段微带交叉耦合带通滤波器的设计

耦合谐振电路在微波滤波器的设计,尤其是在窄带滤波器的过程中起着非常重要的作用。本文采用 基于耦合系数和外部品质因数的耦合谐振电路滤波器的方法设计了X 波段的开环交叉耦合微带带通滤波器。由于 引入非相邻谐振器之间的交叉耦合,在滤波器的输入端口和输出端口之间有多个通路,这种多径结构能在有限频率 处产生多个传输零点,而且通过调整传输零点的位置,可以调整滤波器选择性和带内群时延性能。设计的滤波器在 介电常数为2. 2、厚度为0. 254mm 的RO5880 介质板上加工,测试结果显示,该滤波器具有结构简单紧凑、损耗低、选 择性高、带外抑制极佳的特点,具有较好的工程应用价值。     

小型圆形贴片谐振器宽带带通滤波器设计

提出了一种频率在3.1~6.5GHz范围内的新型小型宽带带通滤波器。该滤波器结合圆形贴片谐振器的多模特性,通过引入输入端和输出端之间的耦合,增加了传输零点。通过三维仿真软件Ansoft HFSS中建模并优化,实现了通带内抑制在-20dB以下,低频段在1.9GHz处产生一个传输零点,高频段在7.6GHz处产生一个传输零点,带外抑制在-20dB以下。实测滤波器的结果与仿真结果基本一致,验证了设计的有效性。     

一种具有简单微带线/共面波导结构的新型超宽带带通滤波器

本文提出了一种具有简单微带线/共面波导谐振器结构的新型超宽带带通滤波器,滤波器在通带的两侧具有两个传输零点。滤波器的输入、输出微带（开路）线之间具有耦合电容效应,该电容可以用来调整低端传输零点。微带（开路）线各自与共面波导谐振器可以形成两个串联电容,同时共面波导谐振器的一条短路枝节线形成了一个并联电感。微带开路线上的延伸微带枝节尺寸可以用来调整滤波器的上端传输零点。利用HFSS对该滤波器进行了仿真设计,详细的设计过程也一并给出。仿真表明滤波器的3dB带宽可以覆盖UWB的整个波段。     

Current-mode continuous-time filters using complementary current mirror pairs

A design of current-mode continuous-time filters for low voltage and high frequency applications using complementary bipolar current mirror pairs is presented. The proposed current-mode filters consist of simple bipolar current mirrors and capacitors and are quite suitable for monolithic integration. Since the filters are based on the integrator type of realization, the proposed method can be used for a wide range of applications. The frequency of the filters can easily be changed by the DC controlling current. A fifth-order Butterworth and a third-order leapfrog filter with tunable cutoff frequencies from 20 MHz to 100 MHz are designed as examples and simulated by SPICE using standard bipolar parameters.     

Inverse Ultraspherical Filters

The inverse ultraspherical filter is derived and its properties analyzed. It is shown that the inverse ultraspherical filter has smaller transition band than the inverse Chebyshev filter under certain circumstances while still maintaining the maximally flat passband characteristic. Filter pole and zero calculations are described and typical magnitude and delay responses generated. Nomographs of inverse ultraspherical filters are also provided for determining filter order and for possible magnitude response optimization.Celestino A. Corral was born in Havana, Cuba. He earned his Bachelors, Masters and Ph.D. degrees in electrical engineering from the University of Miami, Florida, in 1985, 1987, and 1993, respectively. He completed his Ph.D. program under a Patricia Roberts Harris fellowship. From 1988 to 1990 Dr. Corral was a Member of the Technical Staff at Sandia National Laboratories, Albuquerque, New Mexico, where he was involved in the analysis, modeling, and design of custom circuits for piezoelectric sensor components. In 1994, he joined Scientific-Atlanta in Atlanta, Georgia, as an Associate Staff RF Engineer and worked on communication systems and specialized microwave software. In 1997 he was Senior Design Engineer at Origin Data Systems in Boca Raton, Florida, where he had multiple roles in system, hardware, and software development for a novel asset management/RFID system. Currently, Dr. Corral is a Distinguished Member of the Technical Staff in Motorola Labs, Plantation, Florida, and is involved in ultra-wideband, wideband, and propagation research. His interests include circuit and filter theory, communication systems, numerical analysis, signal processing, and constrained optimization. He has published over twenty-five journal and conference papers, has six patents filed, and two trade secrets.Dr. Corral was principal recipient of the Myril B. Reed Best Paper Award for the 40th Midwest Symposium on Circuits and Systems in 1997. Dr. Corral is also the principal recipient of the Ambrose Fleming Premium for IEE Proceedings on Circuits, Devices, and Systems, 2000. Dr. Corral is a Senior Member of IEEE and a member of Omicron Delta Kappa, Tau Beta Pi, and Eta Kappa Nu honor societies.     

波导带通滤波器的精确设计和快速优化

介绍了采用三维微波电磁场仿真软件快速提取直接耦合波导带通滤波器耦合窗口参数的方法,并提出了优化最终模型的快速扫描技术.全波仿真及实验结果表明,该方法能满足波导带通滤波器快速精确设计的要求.     

Design of two-dimensional directional filters

A directional filter has a passband extending fully along a straight line passing through the origin. In its original form the transformation technique, a powerful tool for designing two-dimensional FIR filters, is not useful to design such a filter. In this communication we suggest a few analytical and optimisation-based methods to design directional filters using the transformation technique. The superiority of the proposed methods over existing techniques is demonstrated.     

一种基于CIC滤波器的有效锐化方法研究

介绍了对积分梳状滤波器（CIC滤波器）的有效锐化。所提出的锐化滤波器的结构由两个主要部分组成：一个梳状滤波器的级联部分和一个锐化滤波器部分。所提出的方案使得滤波器中锐化部分的工作速率比输入速率大为降低，其频谱响应特性比传统的也有所改进。通过MATLAB仿真，可看出改进锐化后的滤波器性能更优。     

Miniaturized dielectric waveguide filters

Design techniques for a new class of integrated monolithic high-permittivity ceramic waveguide filters are presented. These filters enable a size reduction of 50% compared to air-filled transverse electromagnetic filters with the same unloaded Q-factor. Designs for Chebyshev and asymmetric generalised Chebyshev filter and a diplexer are presented with experimental results for an 1800 MHz Chebyshev filter and a 1700 MHz generalised Chebyshev filter showing excellent agreement with theory.     

DDC中的抽取滤波器设计及FPGA实现

本文介绍了在数字下变频（DDC）中的抽取滤波器系统设计方法和具体实现方案。采用CIC滤波器、HB滤波器、FIR滤波器三级级联的方式来降低采样率。通过实际验证，证明了设计的可行性。     

一种数字下变频抽取滤波器的设计

对一个针对数字下变频应用的抽取滤波器从设计指标到版图实现的设计过程进行了详细介绍.该抽取滤波器实现了20倍的降采样,由CIC滤波器、CIC补偿滤波器和半带滤波器三级依次串联而成.通过利用抽取滤波器的等价变换和多项分解性质,各滤波器级的硬件电路开销和运行功耗都得到了降低.     

大功率谐波吸收式滤波器设计

介绍了大功率谐波吸收式滤波器的实现电路，这些电路满足了信号分流的技术要求。文中给出了详细的工作原理和测试数据。     

Single-stage line-coupled ac/dc converter with high power factor and ripple-free input current

Single-stage line-coupled ac/dc converter with high power factor and ripple-free input current is proposed. The proposed power factor correction circuit can achieve high power factor and ripple-free input current using a coupled inductor. Experimental results for a 400?W converter at a constant switching frequency of 100?kHz are obtained to show the performance of the proposed converter.