共查询到20条相似文献,搜索用时 15 毫秒
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Jun Xu Fei Xiao Yu Cao Yong Zhang Xiaohong Tang 《International Journal of Circuit Theory and Applications》2019,47(3):379-390
In reality, it is not easy to design microstrip filters for the sake of distributed-element effect. It is an effective approach to approximate distributed-element structures through appropriate lumped-element circuits. In this paper, some basic microstrip structures are discussed, whose equivalent lumped-element circuits are derived. Then, a novel microstrip filter is obtained by connecting these microstrip structures, according to the similar topology of the third-order lumped-element bandpass filter. The equivalent lumped-element counterpart of the proposed microstrip filter clearly reveals its physical mechanism, ie, how the resonances are created and coupled and how the transmission zeros are created. Furthermore, a set of the design formulas are presented, which can be used to calculate initial structure parameters and then facilitate design process. The proposed microstrip bandpass filter can realize a third-order elliptic bandpass response with one transmission zero at each side of the passband. In addition, two short-circuited stubs are added to input/output ports to create the third transmission zero. The filter is featured by good frequency selectivity and out-of-band suppression. For demonstration, an actual example was designed, fabricated, and measured. 相似文献
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基于ADS的一种高指标带通滤波器设计 总被引:1,自引:0,他引:1
介绍了平行耦合线微带带通滤波器的基本原理,提供了一种基于ADS软件设计高指标平行耦合线微带带通滤波器的实例和详细设计步骤,并给出了仿真结果以及ADS优化步骤和原则. 相似文献
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Optimal design of third‐order microstrip bandpass filters by direct synthesis technique (DST) 下载免费PDF全文
Fei Xiao Huarong Gong Yong Zhang 《International Journal of Circuit Theory and Applications》2018,46(10):1827-1837
To design microstrip filters is not easy for the sake of their distributed‐element effect. Undoubtedly, to understand their physical mechanism is very important to their design. In this paper, one effective approach to design some third‐order microstrip bandpass filters with each of 2 transmission zeros at each side of the passband is discussed. Lumped‐element equivalent circuits are used to represent these microstrip filters. Then, these lumped‐element equivalent circuits can be synthesized by direct synthesis technique we recently proposed, so that it is likely to calculate initial structural parameters of these microstrip filters and then facilitate their design. Verified by the measured results of the filter designed through the approach in this paper, the performance of the filters is close to ideal frequency responses. Furthermore, another third‐order microstrip bandpass filter is presented, in which open‐circuited stubs at input/output ports are introduced to suppress one specified harmonic to improve out‐of‐band attenuation. 相似文献
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In this article we reviewed the implicit space mapping concept. We illustrated it using a simple tapped-line microstrip filter example. We demonstrated the robustness of our approach by performing an accurate design of a microstrip hairpin filter. A detailed and easy-to-follow design optimization procedure was provided and the Agilent ADS implementation of the algorithm was described. A good electromagnetically validated design in Sonnet em was obtained in a few fine model simulations. Implicit space mapping is a simple approach to combine a circuit-theory based CAD model and an EM simulator model to achieve fast and accurate optimal design and modeling. 相似文献
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新型开环耦合谐振滤波器的设计与应用 总被引:2,自引:1,他引:1
为了满足日新月异的无线通信对小型化带通滤波器的要求,针对传统类型滤波器存在线性度、矩形系数、插入损耗、体积等方面的问题,笔者介绍了一种通过在微带开环谐振滤波器中引入交叉耦合,产生一对传输极点,从而提高滤波器选择性的滤波器设计方法,并讨论了这种滤波器的综合方法和实现流程。实际设计了一个六阶开环谐振滤波器,并给出了全波仿真结果。分析和仿真都表明这种滤波器具有体积紧凑、选择性高的优点。 相似文献
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Design concepts, fabrication, measurements, and optimization of a microstrip filter, directional coupler, and amplifier are presented. The microstrip circuit implementation is simple and easily alterable for optimization. Results from an undergraduate laboratory course are presented which show reasonable agreement with design parameters, and the optimization process adds to the educational experience 相似文献
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张跃辉 《电子测量与仪器学报》2009,23(Z1):368-371
针对微波上变频器进行研究与设计。主要采用微带电路的形式完成电路的设计。采用HMC412MS8G微波单片集成电路完成微波上变频器研究,重点是利用ADS软件完成了中心频率为11.5 GHz的平行耦合线微带带通滤波器设计和测试。完成了上变频电路板的设计、安装与测试。 相似文献
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基于传统的梳妆线谐振式滤波器设计原理及微带线定向耦合器理论,提出了一种新型的吸收式带通滤波器,其特点是滤波器的电压驻波比不仅在通带内很好,通带外很大频率范围内驻波也小于3.5,这也是该滤波器与常用的反射式滤波器的区别。首先,该滤波器采用微带线结构实现,与传统LC结构滤波器相比,可应用于更高的频段;其次,该滤波器具有较宽的带宽;再者,该滤波器设计灵活简单、成本低、易于集成。通过MWO软件仿真优化,实现了通带中心频率为3500MHz、3d B带宽为479MHz、通带内插入损耗小于3d B、通带内电压驻波比小于2、带外驻波比在很大频率范围内小于3.5的新型微带吸收式带通滤波器的设计。 相似文献
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Xiaolong Zhong Kenneth K. Mei Yaowu Liu 《International Journal of Numerical Modelling》2003,16(4):337-344
A new numerical model of microstrip transmission line circuits in terms of distributed circuit parameters is here illustrated. Based on full‐wave electromagnetic results, the extraction methods of these distributed circuit parameters on different types of microstrip transmission line circuits are introduced. As a preparatory experiment, an improved CAD method using this model is tested on microstrip low‐pass filter. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
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Kari Jokela 《International Journal of Circuit Theory and Applications》1979,7(4):445-461
A design method is described to realize narrow-band stripline or microstrip bandpass filters having one transmission zero near to the upper and lower bandedge. The filters utilize capacitively coupled open half-wave TEM-line resonators. Two nonadjacent resonators are also inductively coupled. No short circuits are needed. The design is based on the approximate or exact synthesis of the lowpass protoype presented by Levy. The transmission line parameters are obtained easily from the design formulae which have been derived using the susceptance (or reactance) slope parameter technique. The filter performance is good up to 12 per cent bandwidth. Measured results show good agreement with the theoretical ones. 相似文献
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Xiaoping Chen Wei Hong Tiejun Cui Zhangcheng Hao Ke Wu 《Electrical Engineering (Archiv fur Elektrotechnik)》2006,89(1):67-70
A planar four-pole dual-mode filter with symmetric transmission response based on substrate integrated waveguide (SIW) is
proposed. The filter centered at 10 GHz, consisting of two TE102–TE201 dual-mode SIW cavities, is implemented in a single layer substrate by PCB process. A linear microstrip taper is used to implement
the transition between 50 Ω microstrip and SIW. The measured results are in agreement with simulated results. 相似文献
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耦合微带线参差谐振带通滤波电路 总被引:3,自引:0,他引:3
对于微波集成振荡器或放大器输出端的滤波器,要求具有较好的抑制谐波性能,本文提出耦合微带线参差谐振带通滤波电路,它由半波长谐振器式平行耦合微带线单元电路与传输线段联构成,其特点是有利于对谐波输出的抑制。 相似文献
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Fei Xiao 《International Journal of Circuit Theory and Applications》2018,46(3):415-426
In radio frequency/microwave or even higher frequency range, various transmission‐line filters have been proposed for frequency selection. Specifically, there is a kind of transmission‐line filters not having source/load inverters. To design them is somewhat difficult, if their physical mechanism is not fully understood. In this paper, the concept of the distributed‐ to lumped‐element equivalence is applied in the synthesis of several microstrip band‐pass filters without source/load inverters. As demonstrated, it can help to reveal the physical mechanism of the filters such as how the resonances are created and coupled. In addition, the distributed‐ to lumped‐element equivalence relations between filter specifications and structural parameters are presented and good initial dimensions are calculated, which will facilitate filter design. Several examples are presented for demonstration. 相似文献
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Pragnan Chakravorty Durbadal Mandal 《International Journal of Numerical Modelling》2016,29(3):520-529
Bandpass filters with wide pass‐band are an essential requirement in various equipments of satellite and defence communication sectors. Here a method of split‐path interactions is proposed to approximately predict the resonant frequency and topology of bandpass filters which otherwise fall under the category of heuristic designs. Curved transmission lines are often required to make filter structures physically compact; however, curvature effects create errors in the theoretical (design) prediction of resonant or central frequencies for bandpass filter design. Earlier propositions on curvature corrections had been considerably precise, but recent design standards demand even higher accuracies. The prime feature of this work is the use of a meta‐heuristic optimization (i.e. Particle Swarm Optimization) technique in curvature corrections for the first time which brings accuracies of over 99% in the corrected results. The split paths used in this design are suitably curved, with the proposed optimized curvature correction technique, so as to attain a compact size of the filter. The resulting filter has a low insertion loss of around −1.00 dB and a sharp stopband cut‐off. Fabrication was done on a FR4 microstrip substrate with a good agreement between measured and simulated results. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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The increasing number of wireless applications have created the need for useful models that promote RF circuit design on modern PCB materials for frequencies below 3 GHz. Accurate models minimize the amount of physical tuning and rework after an RF design has been fabricated. A PCB was developed that allows the full characterization of various case size (0402, 0603, 0805, 1206) capacitors and inductors, microstrip and coplanar lines and tee junctions, ground vias, coupled lines, edge connector transitions, and filters. For simplicity, only the capacitor and inductor models are presented. Results from a high-pass filter design are presented as validation of the calibration and model accuracy 相似文献