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A novel wideband bandpass filter (BPF) using a cross-shaped microstrip multiple-mode resonator (MMR) is presented in the letter. The MMR is composed of a section of open-ended microstrip-line and a pair of short-ended stubs. Its three resonant modes are used to construct the passband of the proposed BPF. And two coplanar waveguides are used as the input/output transmission-lines to improve the coupling between the MMR and input/output transmission-lines. The filter has been investigated numerically and experimentally. Both simulated and measured results show that the filter has a good performance, including controllable bandwidth from 66% to 114%, low insertion loss (lower than 0.78 dB), and a small group delay variation. 相似文献
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Kaixue Ma Liang K.C.B. Jayasuriya R.M. Kiat Seng Yeo 《Microwave and Wireless Components Letters, IEEE》2009,19(1):24-26
A novel multimode bandpass filter with high and wide rejection band is proposed by using an open stub. The open-stub has two functions in the filter: (1) perturbation for the multimode operation and (2) zero point generation at the stopband for the stopband control. With proper input/output coupling, additional two poles, i.e., four poles, can be generated for the proposed filter structure. The design is then verified by experiment. The single structure four-mode filter has low insertion loss, good stopband performance, and compact size and linear phase. 相似文献
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文中设计并实际开发了一种基于砷化镓(Gallium Arsenide, GaAs)集成无源器件(Integrated Passive Device, IPD)技术的小型化高选择性宽带带通滤波器。首先,所提出的带通滤波器是通过引入集总参数谐振器来设计的,以实现高选择性和宽带性能。其次,进一步研究了实现高选择性和宽带性能的工作原理。最后,为了证明所述性能,基于GaAs-IPD技术设计、制造和测量了一个紧凑型高选择性宽带带通滤波器。该滤波器工作频率覆盖了整个X波段(6~13 GHz),相对带宽为74.0%,带外实现了四个传输零点,从而实现了高选择性和良好的带外性能,芯片尺寸为0.05λ0×0.03λ0。比较了实测结果与电磁仿真结果,验证了该设计的可行性。 相似文献
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采用修改的多模谐振器(MMR)结构,在输入端与输出端开槽形成交叉耦合,实现了一种结构紧凑、频率选择性较高的超宽带(UWB)带通滤波器。修改的多模谐振器能产生5个模式和2个在高低截止频率附近的传输零点,提高了频率选择性。在滤波器的基础上,通过加载谐振器,形成在8.11 GHz处具有陷波特性的超宽带带通滤波器。利用HFSS13.0验证设计原理。仿真结果表明,该超宽带带通滤波器通带为2.61~11.21 GHz,陷波频率为8.11 GHz,能有效抑制X频段(7.91~8.31 GHz)卫星通信系统对超宽带通信系统的影响,适用于超宽带无线通信系统。 相似文献
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Sheng Sun Lei Zhu Huei-Hsien Tan 《Microwave and Wireless Components Letters, IEEE》2008,18(3):173-175
A compact wideband microstrip bandpass filter using transversal resonator and asymmetrical interdigital coupled lines is proposed in this letter. A wide passband is first constructed using transversal signal-interference technique, resulting a pair of transmission zeros at each side of the desired passband. By driving this transversal resonator with two asymmetrical interdigital coupled lines at two sides, five extra transmission zeros are generated in the lower/upper stopbands with excellent dc-choked property, thus making up a wide passband with improved out-of-band performance. This wideband microstrip filter is then designed, implemented and experimented. Good insertion/return losses, flat group delay and good out-of-band rejections are achieved as demonstrated in both simulation and experiment. 相似文献
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《Microwave and Wireless Components Letters, IEEE》2009,19(5):290-292
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针对超宽带(UWB)系统易受窄带信号干扰问题,本文提出了一种新颖的带陷波特性的UWB带通滤波器,该带通滤波器由两级交指梳状耦合谐振器级联而成.通过在交指梳状耦合谐振器的一端添加非对称的开路负载,使该滤波器具有了通带内陷波特性.合理地调整开路负载的长度和宽度可以对通带内的任意频段进行抑制.本文设计的UWB带通滤波器工作频段为3.1~10.6GHz,陷波频段为5.8~5.9GHz,抑制电平达到-40dB.仿真结果和测试结果吻合较好,验证了设计的正确性. 相似文献
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《Microwave and Wireless Components Letters, IEEE》2008,18(9):581-583
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A microstrip dual‐wideband bandpass filter using a multimode resonator (MMR) is proposed in this letter. The proposed MMR loaded with a T‐shaped open‐ended stub and a short‐ended stub exhibits triple mode characteristics, and a synthesis method is developed to illustrate the wide passband with independently controllable center frequencies and bandwidths. To verify this design methodology, a dual‐wideband filter with fractional bandwidths of 19.1% and 27.9% is designed and fabricated. The measured results agree with the simulations. 相似文献
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文章提出了一种具有陷波可重构功能的差分宽带带通滤波器,具有良好的差模响应与共模抑制效果。所设计的差分带通滤波器通过采用对称的四阶分支线结构,在差模激励下可等效出电壁,在共模激励下可等效出磁壁。同时,该滤波器通过对称地耦合两个1/4波长的阶梯阻抗谐振器来产生所需频段的陷波特性,并通过改变阶梯阻抗谐振器上变容二极管两端的直流偏置电压来改变阶梯阻抗谐振器的电长度,从而调整陷波的频段。仿真和测试结果表明该差分带通滤波器的工作频带为2.7~7.3 GHz,相对阻抗带宽为92%。在工作频段中,差模回波损耗均大于10 dB,共模抑制大于15 dB。随着变容二极管两端直流控制电压从10.3 V变化到3.6 V,陷波的中心频率从5.6 GHz移动到6.1 GHz,同时滤波器宽带带通特性基本保持不变。 相似文献
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《Microwave Theory and Techniques》2009,57(11):2753-2760
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提出了一种基于LTCC技术的高性能超宽带带通滤波器的实现方法。该滤波器电路采用交织结构,同时只采用了4个谐振级,有效降低了通带内插入损耗,增大了滤波器带宽。借助电路仿真以及电磁场三维仿真软件进行电路优化,实际测试结果与仿真结果吻合较好,中心频率为1 080 MHz,带宽为500 MHz,在通带内插入损耗优于1.6 dB。由于该滤波器频率较低,属于UHF波段,波长较长,采用半集总半分布式结构实现了滤波器的小型化,封装尺寸仅为3.4 mm×4.8 mm×1.5 mm。 相似文献