共查询到19条相似文献,搜索用时 40 毫秒
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本文应用传输线理论对PBG结构带通滤波器进行分析,并在此基础上仿真、设计一种新颖的K波段的双模带通滤波器.光子带隙结构具有独特的带阻特性,对高次模具有很好的抑制特性,能够提高微波电路系统的抗干扰能力.由于PBG的慢波特性,使得带通滤波器的结构尺寸大为减小,符合系统小型化的要求.在此基础上,就这种结构应用Ensemble软件进行优化仿真.最后制作出滤波器并进行了测试.仿真结果与实验结果吻合很好,插入损耗为-4.5dB,通带中心频率为25.2GHz,-3dB带宽为1.8GHz,相对带宽7%. 相似文献
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将高阻抗表面型光子带隙材料用于微带贴片天线的设计,利用其频率带隙抑制天线中激励的表面波.求解辐射方向图,并与常规微带贴片天线相比较,证实了在表面波的影响比较显著的情况下,光子带隙材料的引入可以有效地抑制表面波的传播,从而改善原有天线的性能.仿真结果表明:PBG天线的增益比原贴片天线提高了约0.53 dB. 相似文献
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PBG结构在微波领域的应用 总被引:1,自引:1,他引:1
20世纪80年代末出现的光子晶体是一种具有光子带隙的新材料,其特有的性质使得光子晶体具有广泛的应用前景。本文介绍了光子晶体的概念,综述了光子带隙结构在微波领域的典型应用和研究进展。 相似文献
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基于电磁带隙结构(Electromagnetic Band-gap, EBG),本文设计实现了一种W 波段宽带低损耗带通滤波器。通过EBG 结构的频率带阻特性实现低通滤波,同时利用矩形波导固有的高通特性实现滤波器的低端频率截止。采用减宽波导加载微带EBG 结构的方式将高通与低通结构相结合,经过适当的阻抗匹配设计,实现了覆盖75~110GHz 全W 波段的宽带滤波特性。EBG 结构通过在5mil 厚Rogers5880 基片上制作一系列E 面周期加载的谐振单元构成。实物测量结果表明,在75GHz~100GHz 内,回波损耗典型值为-20dB,在100GHz~110GHz 范围内,回波损耗典型值为-15dB,全带宽内插入损耗典型值小于1dB。该滤波器可用于各种W 波段电子系统及测量设备中。 相似文献
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PBG结构缺陷的谐振特性研究 总被引:3,自引:0,他引:3
本文研究了矩形波导中利用介质层PBG结构形成的Fabry-Perot谐振器的特性,并详细分析了PBG结构的纵向长度、谐振区长度以及介质层介电常数对其谐振特性的影响。本文以制作此类谐振器具有一定的参考价值。 相似文献
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通过对传统二维微带 PBG 结构的研究,针对微带线的传播常数是微带线相对于接地板上周期孔眼的两个主轴的位置和方向的敏感参数而不能根据实际情况任意布线的缺点,提出了一种新型一维微带 PBG(photonic bandgap)单元结构及其等效 L-C 电路模型。本文提出的 PBG 传输线可以应用于微波集成电路中,能够减小电路尺寸,且可以抑制高次谐波的产生。 相似文献
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光子带隙结构在微带线中的应用 总被引:2,自引:0,他引:2
提出了一种用于微带线的光子带隙结构,该结构由在微带线的底板上光刻出成周期型的正方形环缝组成,对此结构进行了仿真.通过改变环缝的边长,可以看到它们具有不同的阻带特性. 相似文献
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Sankar Basu Alfredo C. Tan 《AEUE-International Journal of Electronics and Communications》2001,55(6):397-407
Internally passive filters such as wave digital filters (WDF) and orthogonal filters, which have desirable properties, are developed as filter structures for adaptive filters. The equations for updating the multiplier coefficients as well as for computing the gradients are derived for these filters. The stability monitoring during the adaptation process for these filters is simple to implement. Simulation results are included to demonstrate the capability of these filters in system identification and noise cancellation. Moreover, motivated by applications of multidimensional adaptive filters in video compression and image enhancement, the proposed adaptive wave digital filters have been extended to two dimensions and applied as adaptive fan filters. Computer simulations are also conducted to show their potential applications to two-dimensional system identification and image enhancement. 相似文献
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复周期光子晶体的理想多通道滤波特性 总被引:11,自引:2,他引:11
利用光学传输矩阵法,引入理想因子,研究了3单元复周期结构光子晶体存在理想多通道滤波特性的参数条件。研究发现,其它参数固定时,晶体的高低折射率介质光学厚度比值离1越远,则多通道滤波特性越理想;波的入射角越大,则多通道滤波特性越理想;在适当的参数条件下,可以获得非常理想的多通道滤波特性,对应的理想因子值在10^-4以下。 相似文献
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Vladimir I. Prodanov Michael M. Green 《Analog Integrated Circuits and Signal Processing》1997,13(3):233-240
A family of gm-C biquad structures is derived. These biquads require only a pair of grounded capacitors and three transconductors. It is shown that a pair of complex zeros can be realized simply by replicating the output stage of the transconductance block, thereby constructing a second output current that is proportional to the original output current. Although these biquad structures are very compact, they allow independent programming of the filter's center frequency andQ . IC simulations and measurements are presented using a fifth-order tunable filter as an example. 相似文献
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介绍了阿基米德螺旋天线的原理与设计方法,仿真了背腔式阿基米德螺旋天线,并与实际测试结果吻合;研究了一种新颖的光子带隙平面螺旋天线,这种天线用光子带隙代替金属反射腔作为反射面以得到单向波束,仿真与实验发现,光子带隙阿基米德螺旋天线的增益提高约有2dB,后瓣降低了10dB,在有效的工作带宽内天线的性能得到了改善. 相似文献
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This paper presents a low-level treatment of the non-linear dynamics encountered in log-domain structures, by means of a non-linear circuit element termed a Bernoulli Cell. This cell comprises an npn BJT and an emitter-connected grounded capacitor, and its dynamic behavior is determined by a differential equation of the Bernoulli form. The identification of the Bernoulli Cell leads to the creation of a system of linear differential equations which describe the dynamics of the derived log-domain state-variables. Furthermore, it is shown that the Bernoulli Cell has a memristive type dynamic behavior. The approach aids the analysis of log-domain circuits, and allows the internal non-linear currents to be conveniently expressed in closed analytical form. A worked example for a specific topology with confirming simulation results in both frequency and time-domain is presented. The celebrated Hodgkin-Huxley nerve axon membrane dynamics are also successfully simulated as a characteristic example of memristive behavior. 相似文献