共查询到18条相似文献,搜索用时 156 毫秒
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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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提出一种基于微带三模谐振器的超宽带带通滤波器设计.该滤波器由一个中心加载阶跃阻抗开路枝节的三模谐振器,及两组用于抑制谐波的新型哑铃型缺陷地结构组成.使用交指型馈电方式及在馈电处的地板开槽实现超宽带需要的的强耦合,利用缺陷地结构抑制高次谐波实现良好的阻带特性.仿真结果表明,所设计的滤波器通带3 dB相对带宽达到80%(4.06~9.48 GHz),通带内插入损耗小于0.58 dB,回波损耗大24 dB,通带外10 dB阻带覆盖到30 GHz,通带两侧附近均有一个传输零点,获得了陡峭的通带边缘,较好地实现了美国联邦通信委员会(FCC)授权的超宽带通信系统的频谱使用要求.该滤波器结构简单,谐振器自身尺寸小于中心频率下0.5λg×0.5λg.最小带线和最小缝隙宽度均不小于0.1 mm,易于低成本加工,具有较高的实用价值. 相似文献
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一种水声引信接收机的前端滤波器设计与实现 总被引:1,自引:0,他引:1
水声通信的环境非常复杂,因此需要为水声引信接收机设计一个高性能的前置带通滤波器,即拥有平坦的通带和陡峭的阻带.为解决多重负反馈带通电路的元件离散性大、网络参数对元件变换敏感的问题,本文设计一种正反馈、高Q值带通滤波器,滤波器由三个有源二阶正反馈滤波器级联实现,滤波器中心频率11 kHz,带宽2 kHz,通带纹波不超过1... 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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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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A novel microstrip tunable filter design approach is suggested. Coupling factor of a ferroelectric capacitor connected with the microstrip resonators of the filter is considered to make possible the design of the filter keeping constant the pass band width while tuning. Results of the filter characteristic simulation and measurement are presented. 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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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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基于MATLAB的FIR数字滤波器设计与仿真 总被引:2,自引:2,他引:0
数字滤波器的设计和应用是数字信号处理中的核心内容之一。利用MATLAB信号处理工具箱中的FDATool工具设计出具有去噪滤波功能的有限脉冲响应滤波器,根据滤波器的不同应用需求,利用FDATool工具设计出具不同滤波功能的有限脉冲响应滤波器,并且根据设计要求和滤波器特性随时调整参数,直观简便,极大地减轻了工作量,极大方便了滤波器的设计,达到理想的应用目的。最后,对所设计的滤波器进行滤波仿真验证,对含有噪声的信号进行去噪处理,通过比较分析滤波器去噪前后信号时域及频域波形图,得出所设计的滤波器能够达到理想的去噪效果。 相似文献