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本文从理论和设计两方面说明开关电容高Q陷波电路也可以通过Q倍增结构实现。采用这种结构还可以减小电路的电容比和总的电容值,从而减小制造芯片时的面积. 相似文献
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提出了一种基于CCCⅡ的三输入单输出多功能电流模式双二阶滤波器结构.该滤波器结构简单,仅包含两个MOCCCⅡ,一个电阻和两个接地电容.该结构通过选择不同的输入端和输出端可以得到4个三输入单输出二阶多功能滤波电路,这4个电路均可以实现低通、高通、带通、带阻、全通滤波功能,并且角频率ω<,0>和品质因素Q可以实现独立可调,具有很低的无源和有源灵敏度. 相似文献
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本文提出了一种具有较低灵敏度和正反两相输出的开关电流(SI)改进型通用积木块(MUB),可以实现抽样数据信号处理的各种基本运算.据此,以开关电容电路为原型,采用信号流图方法生成了一种新型SI高Q双二次滤波器,可获得低通、高通、带通和带阻等多种滤波功能。 相似文献
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一种新的利用运放极点的有源滤波器 总被引:1,自引:0,他引:1
本文提出一种新的由一个运放、一个电容和几个电阻组成的有源滤波器电路。该电路充分利用了运放的极点,能实现低通、高通、带通、带阻和全通网络功能。作为带阻滤波器时,不仅能独立地调节ω_0与Q,并能调节阻带衰减。文中给出了计算实例与实验结果。 相似文献
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文中基于KHN电路结构,使用第二代改进电流传送器,提出二阶滤波器的电流模式实现电路,该电路能实现低通,带通,高通,全通,带阻及陷波等各种二阶滤波器函数。同时该电路具有输入阻抗低,输出阻抗高、元件灵敏度低等优点,易于级联实现各种高阶电流滤波器函数,另外该电路也便于集成实现。 相似文献
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Xiao-Hua Wang Bing-Zhong Wang Hualiang Zhang Chen K.J. 《Microwave Theory and Techniques》2007,55(9):1912-1918
A new slotted ground structure featuring compact size and spurious-free passband in the context of microstrip lines is proposed. The compactness of the new structure originates from the lengthened coupling gap in the ground. The spurious-free response in a wide passband is a result of combining both narrow and wide slots in the new structure, which effectively forms a stepped-impedance slot resonator. Compared to the previously proposed dumbbell- and H-shaped defected ground structure, over 40% size reduction can be realized in the new structure. The new structure also provides flexibilities in introducing additional functionalities to the bandstop resonators. By embedding varac- tors in the slotted ground structure, tunable bandstop resonators can be implemented and 13% tuning range centered at 2.36 or 2.67 GHz have been obtained. 相似文献
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《Microwave Theory and Techniques》1983,31(12):1045-1050
A complementary relation between a dual-mode bandpass and bandstop waveguide filter is found. Then a new idea for constructing a bandstop filter is developed. Two trial samples of bandstop filters are constructed to demonstrate the principle. 相似文献
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《Microwave Theory and Techniques》2009,57(3):657-666
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《Microwave Theory and Techniques》1974,22(4):394-399
A new class of waveguide filters is introduced, constructed from several thin plates sandwiched together. The combination of alternate plates having large and small rectangular apertures leads to a propagating structure which possesses a bandstop response and prescribed characteristic impedance. This basic element may be used as a simple compact bandstop filter, particularly where the main passband and stopband are well separated, such as in harmonic rejection. For filters with many stopbands, combinations of several waveguide sandwich filter elements are used to provide the main passband and the required attenuation characteristics in the prescribed stopbands. Although the filter is ideally suited for bandstop filtering due to its small size, low cost, low loss, and high power handling capability, additional applications to bandpass filtering and dispersive delay line operation are also cited. 相似文献
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Hsu C.-L. Wu M.-L. Liu Y.-C. Lee Y.-C. Chang J.-Y. 《Photonics Technology Letters, IEEE》2006,18(24):2572-2574
In this letter, the broadband notch filter exhibiting a flattened bandstop spectral response is experimentally demonstrated for the first time by using the guided-mode resonance associated with the periodic subwavelength structure possessing asymmetric binary grating profiles. The proposed filter consisting of grating and waveguide structures is realized by utilizing a single-layer poly-silicon film deposited on a quartz substrate. The asymmetric grating profile is carried out by dividing the one-filling-factor binary structure into the one with two distinct filling factors within one identical period. A flat bandstop spectral response at the central wavelength of 1.22 mum is obtained under normal incidence for transverse-electric polarization. Its transmittance of bandstop spectrum can be suppressed as low as -20dB within a broad spectral range of 85 nm and its corresponding Deltalambda/lambda is larger than 6%. The spectra under oblique incidence are demonstrated to verify the proposed filter has a high immunity for the angular deviation up to 20deg 相似文献
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A new resonant bandpass filter based on a photonic band gap (PBG) structure is designed and optimised. The finite-difference time-domain method is applied to characterise the proposed filter. The filter is much easier to fabricate, more compact and simpler to design than the conventional parallel-coupled line filter, has wide stopband and steep and deep upper bandstop. The filter length is about one guiding wavelength (/spl lambda/e). A semiconductor-based structure is realised using microelectronics technology and good agreement between the experimental and simulation results has been achieved. 相似文献
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Dual-band bandpass filters using equal-length coupled-serial-shunted lines and Z-transform technique 总被引:3,自引:0,他引:3
Lin-Chuan Tsai Ching-Wen Hsue 《Microwave Theory and Techniques》2004,52(4):1111-1117
A synthesizing method is presented to design and implement digital dual-band filters in the microwave frequency range. A dual-band filter consists of a bandstop filter and a wide-band bandpass filter in a cascade connection, wherein the transfer functions of both the bandpass filter and bandstop filter are expressed in the Z domain. The bandstop filter is implemented by using a coupled-serial-shunted line structure, while the wide-band bandpass filter is constructed by using a serial-shunted line configuration. In particular, the bandwidth of each passband of the dual-band filter is controllable by adjusting the characteristics of both the bandpass filter and bandstop filter. By neglecting the dispersion effect between microstrip lines of different widths over a wide bandwidth, a dual-band filter is realized in the form of microstrip lines and its frequency responses are measured to validate this method. 相似文献
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基于螺旋交指结构设计了一种新型的带阻谐振单元,并采用全波仿真软件对其进行分析。仿真结果表明,在此谐振单元中存在2个较窄的阻带,改变单元结构的尺寸可分别控制2个阻带的位置。在此基础上,采用2个单元级联的方式设计并加工了一款具有优越电磁性能的结构紧凑的双频带阻滤波器。采用矢量网络分析仪对所设计的滤波器进行测试,测试和仿真结果吻合较好,2个阻带的中心频率为3.30GHz和4.93GHz,对应的阻带带宽分别为3.233.37GHz和4.733.37GHz和4.735.10GHz,阻带边缘陡峭度大于90dB/GHz,所设计的带阻滤波器具有优越的性能。此外,该滤波器的有效尺寸为24.0mm×5.2mm,与传统带阻滤波器相比较,小型化优势明显。 相似文献
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电磁带隙结构(EBG)是一种周期性结构,具有明显的带阻特性。首先介绍了EBG结构的特点,通过理论分析计算和仿真,阐述了其禁带形成的原因,依据EBG结构所具有性质的特点,分析了该结构对表面电流的影响。并利用EBG结构带阻特性以及影响表面电流的特性,将其应用于抑制表面电流从而减小电磁干扰(EMI)。通过仿真建模实验、数据测量得到的结果,说明了将EBG结构应用于抑制电磁干扰的可行性。 相似文献