Design and simulation of a compact ultra-wideband bandpass filter with a notched band using multiple-mode resonator technique

A novel, compact, and highly selective ultra-wideband （UWB） bandpass filter with a narrow notched band is presented. Apart from having a basic structure of a slotline multiple-mode resonator （MMR） and microstrip feed lines, this novel design introduces a cross-coupling between the input and output feed lines to enhance the filter selectivity. The design strictly follows the theory and verified by electromagnetic （EM） simulation and experiments. In addition, the narrow notched band is introduced by embedding a pair of split ring resonators （SRR） in order to reject any undesired existing radio signals that may interfere with the Federal Communications Commission （FCC）-defined UWB band. By changing the structural parameters of SRR, it can be easily tuned to any desired frequency. This filter can be integrated in UWB communication systems and efficiently improve the interference immunity from undesired signals such as wireless local area network （WLAN）.

Arm Voltage Balancing Control of Modular Multilevel Resonant Converter

Modular multilevel resonant converter is an promising candidate for high voltage applications since it has advantageous features,such as high efficiency,high voltage capability and easy fault-tolerant operation.However,the inequality of arm inductance in practice will lead to imbalance between the upper and lower arm voltages,which will induce large ripples in the circulating current and a dc bias on the voltage generated by modular circuits.To compensate for the voltage imbalance,effects of arm duty cycle changes on arm voltages are discussed.An arm voltage balancing control method is proposed:adjust arm duty cycle according to arm voltage deviation in every switching cycle.Simulation and experimental results are presented to validate the theoretical analysis and the proposed control method.

一种基于多模谐振器的超宽带带通滤波器设计

基于多模谐振器（MMR）理论，采用微带线-槽线混合结构，通过增加输入、输出之间耦合提高频率选择性，设计了一种结构紧凑体积小，频率选择性高的超宽带带通滤波器。利用电磁仿真软件HFSS对设计结果进行了仿真。仿真结果表明：该滤波器通带覆盖了3.5～10.4 GHz之间的频段，并具有较好的带内带外性能。对该滤波器进行了实物加工和测试，实测结果与理论分析和仿真结果吻合良好，该滤波器拥有较好的性能，可应用于超宽带无线通信系统。

基于H型缺陷地结构的超宽带带通滤波器设计

微波频段的宽带滤波器一般具有通带插入损耗大,带外抑制性差等问题,为了解决这个问题,采用具有慢波效应的缺陷地结构（DGS）和缺陷微带结构（DMS）,设计了一种新型微波频段的超宽带滤波器。分别利用电磁仿真软件HFSS和平面印制板技术对其进行建模仿真和实物加工。实测与仿真结果良好吻合,带内插入损耗优于1.64dB,回波损耗优于13.93dB,通带范围在2.75-8.3GHz,实现相对带宽100.45%,高低阻带均抑制在-10dB以下,且该滤波器结构紧凑,体积小。

基于多模谐振器的三通带滤波器的设计

利用一种新型多模谐振器设计了三通带滤波器。新提出的多模谐振器采用四模谐振器加载两个开路枝节构成,能够产生六个传输极点。该滤波器经过仿真设计后进行实物加工,测试得到各通带的中心频率分别为2.55,3.83,6.00 GHz,相对应的插入损耗分别为0.9,0.7,2.3 d B,与仿真结果吻合良好。该滤波器具有回波损耗小、尺寸小的优点,可应用到现代无线和移动通信中。

ANALYTICAL DESIGN OF A MICROSTRIP UWB BPF WITH SHARP REJECTION

This paper presents a new Ultra-WideBand (UWB) BandPass Filter (BPF) using half-wavelength Stepped-Impedance Stub-Loaded Resonator (SISLR). Analytical equations derived by the even-odd mode analysis show the new filter has two tunable transmission zeros at both sides of the passband to provide a sharp rejection and seven transmission poles inside the passband to achieve U.S. UWB performance. For verification, a UWB BPF is designed, fabricated and measured. The measured results show that the fabricated filter has a -3 dB fractional bandwidth from 3.0 GHz to 10.9 GHz and its insertion loss less than 0.9 dB over the whole passband. Furthermore, the new filter exhibits a simple topology, sharp rejection, and deep stopband suppression.

采用快速空间映射算法多模超宽带滤波器有效设计方法

文章用快速空间映射算法(ASM)来优化和设计多模(MMR)超宽带滤波器。快速空间映射算法需要一个粗糙物理模型以及一个精确物理模型。文中用MATLAB来建立粗糙物理模型,使用商业仿真软件HFSS10来建立精确物理模型。快速空间映射算法就是用来找到粗糙模型和精确模型之间的映射关系,从而达到快速和精准设计超宽带滤波器的目的。

一种具有陷波特性的超宽带超导滤波器设计

研究了具有陷波特性的超宽带超导滤波器设计方法,采用两级多模谐振器实现了具有超宽带通带的超导滤波器,具有带内插损低、带边陡峭度高、结构紧凑的优点。为了抑制通带内不需要的干扰信号,采用开路短截线的方法成功引入一个中心频率为5GHz的阻带。未经调谐的测试结果和仿真结果吻合得很好,3-dB带宽从3.28GHz到10.56GHz,相对带宽为105.2%。超宽带通带内引入的阻带具有高的选择性(3-dB带宽小于5%)和高的抑制度(高于60dB)。此外,通带反射系数高于14.2dB。