大幅减小刻蚀误差影响的高温超导滤波器研制

研制了一种具有良好刻蚀容差性能的类发夹型高温超导滤波器,在同等刻蚀条件下,达得更高的性能指标.在给出计算与设计过程的基础上,对出现大幅度欠腐蚀50 μm的类发夹型滤波器进行实际测试,其中心频率只偏移约30 MHz,并对该结构与直线型结构的刻蚀容差性能进行深入的比较分析,对类发夹型谐振器,每欠腐蚀2 μm,谐振频率比正常腐蚀偏低1 MHz,约为直线型谐振器的1/4,实验测试结果与之较好吻合.该研究结果,大幅降低了滤波器制作对刻蚀技术精度的依赖性,具有广泛的应用前景.     

Ku波段发夹型滤波器的设计

介绍了设计Ku波段发夹型微带滤波器的基本原理,对抽头发夹线谐振器结构进行修正,并通过大量仿真计算得到其耦合系数修正曲线。描述了抽头发夹线微带滤波器的设计方法和初值计算。最后给出了Ku波段5阶发夹型带通滤波器的设计实例和测试结果。     

多次谐波抑制的微波滤波器

提出一种新型的具有多次谐波抑制功能的发夹型微波带通滤波器,主要工作在2GHz频率。对该滤波器通过仿真优化,并进行实际设计测量。在该结构滤波器中,采用阶跃阻抗结构的发夹谐振器来达到缩小尺寸、多次谐波的目的。该滤波器相比于传统的微带线发夹型滤波器具有尺寸小,频率选择性好,阻带宽的特点。     

耦合窗结构窄带LTCC滤波器设计

对各种类型的阶梯阻抗谐振器进行了分析和比较,λg/2型SIR谐振器最适合LTCC滤波器的设计;同时分析了耦合窗结构原理,多层LTCC滤波器适合采用这种耦合结构,可以大大缩小滤波器的体积;本文详细介绍通过多层孔径弱耦合、小型化发夹谐振器结构的LTCC多层窄带耦合窗滤波器设计方法,并进行该结构两种滤波器实物版图加工,实测结果与仿真结果比较吻合。该结构窄带滤波器结构小巧新颖,易于集成在小型化微波多芯片组件中使用。     

基于阶梯阻抗的发夹结构低通滤波器设计

提出一种基于阶梯阻抗发夹谐振器的小型化微波低通滤波嚣,该滤波嚣仅由包含四节微带的阶梯阻抗发夹谐振器构成.设计结果表明,滤波器3dB通带从直流到2.8G,带内反射小于-20dB,带外抑制达到40dB.这种滤波器尺寸小,易制造,且具有陡峭的截止频率响应特性,可用于许多微波系统中.     

Ku 波段微带交叉耦合带通滤波器的结构与设计

基于广义切比雪夫滤波器综合理论,本文设计了一个Ku 波段微带发夹谐振型交叉耦合滤波器。该滤波器的拓扑结构为CQ 型。由于引入非相邻谐振器之间的耦合,在有限频率点处产生传输零点,这样不仅使滤波器具有更好的选择性,而且其结构更加紧凑,尺寸也大大缩小。本文通过HFSS 电磁仿真软件对其进行了优化设计。其仿真结果很好地体现了该滤波器的特性。与同阶数的传统滤波器相比,交叉耦合型滤波器具有更好的带外抑制特性,有较好的工程应用意义。     

GHz频带声表面波谐振器的研究

本文叙述了GHz频带声表面波谐振器的设计、制造和试验结果.对两种不同模式的声表面波谐振器进行了研究,它们是瑞利波型谐振器和表面横波型谐振器.对两种波型谐振器的频率温度特性进行了比较.最后对表面横波(STW)谐振器在振荡器中的应用进行了研究.     

一种金属谐振器与介质谐振器组合应用设计高性能滤波器的方法

本文主要研究金属谐振器与介质谐振器组合应用设计高性能滤波器的方法,首先通过对传统的由金属谐振器组成的滤波器及由介质谐振器组成的滤波器进行对比分析,提出了新的成本更优廉的滤波器实现方式,同时利用三维电磁场仿真软件HFSS对谐振腔进行电磁场分析,最终给出一种结构简洁、易于实现、成本更低廉的新的滤波器设计方法。     

微带抽头线滤波器的设计

本文旨在给出微带抽头线滤波器的设计步骤及相应的设计曲线。除微带抽头线交指滤波器以外,还介绍了一种新的抽头式发夹线滤波器。推导了带抽头的发夹式谐振器的单端加载Q值计算方程。提供了带宽为百分之二十的滤波器实验数据。     

低频段高功率电调谐振器技术分析

针对宽调谐电调滤波器在甚高频(VHF)频段难以实现承受高功率、体积小型化的问题,通过ANSYS HFSS软件建模和仿真,分析了VHF频段腔体滤波器几种不同谐振器的特点,对谐振器各种参数进行了优化,提出了一种新型的结构形式——螺旋与SIR混合式谐振器,用该谐振器实现了一款VHF频段的陷波滤波器.测试结果表明,该谐振器在V...     

Miniaturized hairpin resonator filters and their application toreceiver front-end MICs

The authors describe the fundamental characteristics of miniaturized hairpin resonators having parallel coupled lines and show their applications to bandpass filters and receiver front-end microwave integrated circuits (MICs). A method for calculating filter coupling parameters using a general-purpose microwave circuit simulator is presented. The bandpass filters have a suitable structure for MICs, and their size is one-half that of conventional hairpin resonators without increasing insertion losses. Trial receiver front-end MICs using these filters have been developed and have shown good characteristics such as low noise and a high image suppression ratio. They are applicable to a frequency range above the L-band     

A closed slot-line resonator filter

A microwave bandpass filter made from three-dimensional (3-D) slot-line resonators is described. This structure readily lent itself to the design and realization of a 16-pole filter. By concentrating the losses on the resonant element, very high Q can be achieved by using low surface resistance material, such as high temperature superconductor, for the slot-line resonator. The filter is five to ten times smaller than previous generation 3-D filters made using high temperature superconductors.     

Microwave filters-applications and technology

This paper describes the development of microwave filter technology from an applications perspective. Military applications required wide-band and tunable devices for electronic support measures receivers, which led to the development of highly selective wide-band waveguide filters, coaxial resonator and suspended-substrate multiplexers, and electronically tunable filters. The satellite communications industry created demand for low-mass narrow-band low-loss filters with severe specifications on amplitude selectivity and phase linearity. These requirements resulted in the development of dual-mode waveguide and dielectric-resonator filters, and advances in the design of contiguous multiplexers. Cellular communications base-stations demanded low-loss high power-handling selective filters with small physical size, capable of being manufactured in tens of thousands at a reasonable cost. These demands led to advances in coaxial resonator, dielectric resonator, and superconducting filters, and also to methods of cost-reduction, including computer-aided alignment. Cellular radio handsets have required the manufacture of hundreds of millions of extremely small very low-cost filters, still with reasonably low loss and high selectivity. This has driven significant advances in integrated ceramic, surface, and bulk acoustic-wave active filters and filters using micromachined electromechanical systems     

双模曲折悬置带线环四极微波滤波器

该文研制了双模曲折悬置带线环四极微波滤波器。采用全波技术对该种滤波器特性进行的计算表明,它具有优良的窄通带、高选择性和小体积,与同类型二极滤波器相比,过渡带更陡峭。采用优化设计方法设计出了滤波器电路尺寸,制造了以r=2.8的Teflon为介质基片的滤波器,测试得到的双模曲折悬置带线四极滤波器的中心频率为f0=1.194 GHz,△f=19.4 MHz,通带插入损耗LP4.3 dB,阻带衰减Ls50 dB,实验结果和CAD预测作了比较,两者基本一致。这种滤波器可望在多种微波系统和移动通信系统中应用。     

谐振器加载石墨烯的双通带可调滤波衰减器设计

石墨烯材料在微波段的阻抗可控特性是其最有价值的应用特性之一。文中首次分析了石墨烯对微带 多模谐振的影响机理,提出了一种集成滤波衰减功能为一体的灵活可控器件。首先,对不同位置加载石墨烯的微带双 模谐振器进行了严格的等效电路建模,通过奇偶模分析法及输入导纳参数计算,探究了双模谐振受石墨烯阻抗及其加 载位置的影响,明晰了石墨烯材料对微波谐振器的影响。随后设计了动态可调的滤波衰减器并阐述了石墨烯材料在谐 波控制上的潜在应用点。最后,采用不同尺寸的双模谐振器进行石墨烯加载并完成双通带幅度独立可控的滤波衰减器 的设计,仿真与实测结果吻合良好,验证了阻抗可控石墨烯材料在可调微波衰减类器件上的应用前景。     

高选择性发夹型带通滤波器的设计

微带发夹型带通滤波器具有尺寸小、结构简单、性能稳定等优点,在射频微波领域有着广泛的应用。 本文使用ADS 软件设计仿真了一种高选择性抽头式发夹型带通滤波器。与一般发夹型滤波器相比,该滤波器在输 入输出端并联四分之一波长开路微带线,通过在寄生通带增加传输零点的方法提高滤波器的带外抑制性能。另外, 在该滤波器的谐振单元上增加并联阶跃阻抗枝节,在通带两侧产生一对传输零点,来提高该发夹型带通滤波器的选 择性。最后对这种高选择性发夹型带通滤波器进行实物加工,测试结果证实了该带通滤波器的良好选择性能。     

Circular TE/sub 011/Mode, Trapped-Mode Band-Pass Filters

Band-pass filters are described which utilize a novel type of resonator which has been named a "'trapped-mode resonator." This type of resonator uses a structure which is open on its sides so that energy in all but a single desired mode tends to radiate out to energy-absorbing material. However, energy in the desired resonator mode is trapped within the structure and a high-Q resonance occurs, such as is typical of conventional microwave cavity resonators. The use of resonators of this type makes possible the design of band-pass microwave filters which have a pass band similar to that of other multiresonator microwave filters, but without the many unwanted pass bands which are typical of microwave filters. The particular type of filter discussed utilizes the circular TE/sub 011/ mode. Several experimental filter structures of this type were constructed, and the results of laboratory tests are described.     

基于阶梯阻抗发夹谐振器的小型低通滤波器

提出一种基于阶梯阻抗发夹谐振器的小型化微波低通滤波器,该滤波器仅由包含一节微带线的阶梯阻抗发夹谐振器构成。设计结果表明,滤波器3dB通带从DC(Direct Current)到2GHz,回波损耗优于10dB,且插入损耗从DC到1.7GHz时优于0.5dB,带外抑制从2.9～4GHz优于20dB。仿真结果和实验结果吻合良好。这种滤波器尺寸小,易制造,且具有陡峭的截止频率响应特性,可应用于许多微波系统中。     

Compact lowpass filter using stepped impedance hairpin resonator

A novel microwave lowpass filter using a microstrip stepped impedance hairpin resonator is proposed. This filter has the advantages of compact size, easy fabrication, and sharp cutoff frequency response. The filter is useful for many microwave system applications