带状线交指滤波器的准确设计

在L、S等较低的微波频段,带状线交指滤波器是常用的滤波器之一。文献上一般只给出比较详细的矩形杆间距和带状线宽度的设计公式,对于谐振杆长度l或者端间隙Sa的确定,以及终端杆边距S0的确定,仍然要通过实验方法不断修改多次才能完成。提出了十分简单准确有效的电容间隙Sa的设计方法,即Sa=b/4,解决了一直困扰工程师的一个难题。     

带状线交指滤波器电容间隙的准确设计

在L、S等较低的微波频段，带状线交指滤波器是常用的滤波器之一，文献上一般只给出比较详细的矩形杆间距和带状线宽度的设计公式，对于谐振杆长度，或者端间隙Sa的确定，以及终端杆边距Sa的确定，仍然要通过实验方法不断修改多次才能完成。本文在工程实践与分析研究的基础上，提出了十分简单准确有效的电容间隙Sa的设计方法，即Sa=b／4，不再需要繁琐的近似计算以及大量的实验过程和高频仿真，解决了一直困扰工程师的一个难题。     

采用平行耦合的带状线阶梯阻抗谐振器的带通滤波器

——本文推导了采用平行耦合的带状线阶梯阻抗谐振器的带通滤波器设计公式。公式考虑了任意耦合电长度以及四分之一波长耦合结构。这种滤波器的优点是通过改变谐振器结构,可以控制寄生响应和插入损耗。利用这个设计公式,设计并制船了两个实验滤波器,它们的性能与理论计算相一致。     

一种新的微带线梳状滤波器设计方法研究

针对现有微带线梳状滤波器设计方法在计算滤波器初始值方面存在误差较大、优化困难等问题,通过带状线模型与微带线模型的比较,提出一种新的微带线结构梳状滤波器设计方法。该方法基本思路仍然采用带状线梳状滤波器的设计方法,通过简单的模型变换,即可设计相应的微带线梳状滤波器。该设计方法计算简单,初始值计算较为精确。利用ADS软件对设计初始值进行仿真比较,证明了该设计方法的有效性。     

一种新型交指-发夹型多层带状线带通滤波器

提出了一种新型交指－发夹型多层带状线带通滤波器结构,并设计加工了一个中心频率为2.25GHz,分数带宽为31%的四级带通滤波器,测试值与仿真值吻合得较好.通过仿真结果比较以及实验结果证明,与传统交指型带通滤波器相比,新型交指－发夹型滤波器不但体积减小了约一半,而且能够方便地引入交叉耦合,从而在阻带内产生传输零点,很好地改善滤波器的频率选择特性.     

多层LTCC带通滤波器的设计

LTCC技术具有可实现高密度电路互连、内埋置无源元件、延迟小以及优良的高频特性与可靠性，目前正成为微波与射频等通讯领域常用的技术之一。本文给出了设计多层LTCC带通滤波器的一般步骤，设计时所需注意的事项，并利用HFSS对中心频率为2450GHz，带宽为100MHz的滤波器进行了仿真模拟。讨论了采用平行耦合圆杆带状线电感、电容的实现，给出了电路模拟和仿真模拟的结果．     

平行耦合线滤波器

介绍了交错平行耦合带状线滤波器的设计方法及其过程，用此方法设计了7．5～18GHz的带通滤波器，使用Microwave Office软件对此滤波器进行了仿真，并对滤波器进行了安装测试。     

微带交指带通滤波器计算机辅助设计

本文利用带状线分布特性和数值处理,给出了带屏蔽的多平行交指微带线的分析公式;在此基础上,得到了微带交指型带通滤波器(MIBPF)的机辅设计方法。最后,采用该方法设计了四个 MIBPF 样品,实验结果表明,效果令人满意。     

耦合带状线微波带通滤波器的仿真设计

本文介绍了一种耦合带状线微波带通滤波器的设计思路,并使用Ansoft公司最新的微波仿真软件HFSS11设计仿真C波段耦合带状线滤波器。得到理想结果,且应用到产品上。     

平行耦合带状线带通滤波器的分析方法

传输线理论分析法由于未考虑到滤波器中不连续性结构所带来的传输损耗,往往其分析结果不够准确。针对这一问题,提出了一种新的平行耦合带状线带通滤波器的分析方法。在已获得的带状线不连续性等效电路模型基础上,运用传输线基本理论推导出了附加开路线的平行耦合带状线传输矩阵计算公式,将平行耦合带状线带通滤波器等效成单根带状传输线子网、阶梯跳变子网以及附加开路线的平行耦合带状线子网的级联,通过上述多个级联子网的传输矩阵相乘得到该滤波器的散射参数。实例验证结果表明,该方法计算结果与IE3D软件仿真结果吻合较好,且该滤波器散射参数的平均误差小于2%。     

Artificial Neural Network Models for the Gap Discontinuities in Stripline Circuits

Gap discontinuities appear in many stripline circuits, such as the multilayer microwave monolithic ICs and the interconnect systems in high-speed digital circuits. In this paper, a multilayer perceptron neural network (MLPNN) is used to model the gap discontinuities in stripline circuits. The MLPNN is electromagnetically developed with a set of training data that are produced by the full-wave finite-difference time-domain (FDTD) method. The full-factor design of experiments is used for determining the size of the training data.     

毫米波悬置微带线带通滤波器的精确设计

本文基于悬置微带线间隙不连续性的严格分析,导出了计及色散效应的不连续性等效电路参量。应用宽带网络综合理论,给出了端部耦合的悬置微带线带通滤波器的精确设计方法。根据这一方法,设计和试制了两个不同带宽的Ka波段带通滤波器样品,实验测得滤波器的带内最小插入衰减分别为1.42dB和1.01dB。     

径向微带线元件的计算方法

本文给出了设计径向微带线元件的一种工程计算方法.在微波集成电路中,用径向微带线元件组成的偏置电路工作带宽较宽,占用的衬底面积较小.     

Leakage of the dominant mode on stripline with a small air gap

In addition to the expected bound (proper) dominant mode, an independent leaky, (improper) dominant mode has been found to exist on a conventional stripline that has a small air gap above the conducting strip. Such an air gap often occurs during the fabrication process, and has in the past been suspected as the cause of spurious performance. This newly discovered leaky dominant mode leaks into the fundamental TM ₀ parallel-plate mode of the background structure, which is a parallel-plate guide with an air gap. Furthermore, it is found that the leaky dominant mode, not the bound dominant mode, is the continuation of the stripline TEM mode that exists with no air gap. Hence, it is the leaky mode that is excited predominantly by a conventional feed for the small air-gap structure. The general properties of both the bound and leaky dominant modes are obtained by using a full-wave spectral-domain approach. The primary purposes of this paper are to discuss the nature of the leaky dominant mode, and to show that its presence is indeed responsible for spurious transmission-line performance, such as unexpected loss and crosstalk, and interference between the bound and leaky dominant modes. These conclusions are verified experimentally     

悬置微带间隙不连续性的准TEM波分析

本文提出了悬置微带间隙不连续性的一个分析方法准TEM波分析。以间隙不连续性中心为基点,向两侧等间距地置入具有同样结构的间隙不连续性,从而构造出一个周期的不连续性阵列。不连续性间的距离(周期)是这样选择的,以致两者的互作用消失。研究其中的一个周期区域,利用二维Fourier变换技术计算出它的总电容,根据总电容,得到不连续性的等效电路参量。当悬置微带退化成微带线时,数值结果与R.S.Yahya等人(1974)给出的结果基本一致。     

Analyse de Circuits Passifs en Technologie Microruban Suspendu

Simple and complex suspended stripline uniaxial discontinuities are precisely characterized using the modal analysis combined with the spectral domain approach. Frequency dependent equivalent circuits for the studied discontinuities are derived. They can be used as data base for microwave cad programs. A directional coupler and different resonators are realized in this suspended stripline technology using the results of this study. Experimental performance of these components validates our theoretical results. An integral equations technique solved by the method of moments is used to characterize suspended stripline multiaxial junctions. Examples of the results are given for a bend, a T or a meander. A good agreement is observed between theoretical results and experimental ones.     

基于ADS的X波段低噪声放大器的设计与仿真

主要介绍了低噪声放大器的设计理论及用Agilent公司的ADS仿真软件进行X波段低噪声放大器的设计和仿真。在设计的过程中选择了NEC公司的HEMT管NE3210S01,HEMT管与FET相比较,其噪声系数更低,增益和工作频率更高。进行阻抗匹配采用的拓扑结构是并联导纳式结构,即利用串联微带传输线进行导纳变换,然后并联一个微带分支线,微带线的终端开路(或短路),用其输入导纳作为补偿电纳,以达到电路匹配。最后给出了仿真结果、版图设计及实测结果。     

Suspended stripline on magnetized ferrite and anisotropic dielectric substrates

Suspended stripline on magnetized ferrite and anisotropic dielectric substrates are examined here. The spectral domain immittance approach was used for obtaining the dyadic Green's functions in the Fourier transform domain. Galerkin's method was used to obtain the dispersion characteristics of the dominant mode, and the curves for a few cases are shown as examples which could be used in designing isolators, phase shifters, and directional couplers.     

New numerical data on open-end and gap stripline discontinuities

The excess charge technique in the spectral domain is applied to determining the quasistatic capacitances of the lumped equivalent circuits of open-end and gap stripline discontinuities. The numerical results obtained are used to check the validity of available closed-form expressions. These expressions are found to be inaccurate for stripline gaps when the strip width-ground plane spacing ratio is small.<>