共查询到20条相似文献,搜索用时 62 毫秒
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提出了一种基于缺陷地结构的新型左手传输线结构。新结构由微带线与共面波导通过上下耦合构成,其中共面波导由缺陷地(DGS)结构设计,串联电容通过介质基板上表面的微带线与共面波导中心导带耦合而成,并联电感则由共面波导与地之间的短截线得到。 相似文献
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提出一种应用于超宽带通信且结构紧凑的平面微带带通滤波器,通带范围为3.1~10.6 GHz,带内插损小于1 dB,群延时为0.2~0.6 ns,高于10 dB的带外抑制.超宽带的带宽通过在耦合微带线正下方底面加载缺陷地结构(DGS)实现;分别在耦合线上加载折叠的阶跃阻抗枝节和DGS上附加2条槽线,在通带的低频和高频边沿产生2个传输零点,以获得较好的频带选择性与良好的带外抑制.在实验误差允许下,仿真和测量结果较一致. 相似文献
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介绍目前应用于微波平面电路小型化领域的DGS结构,通过仿真试验研究了DGS结构对耦合微带双线的影响,基于仿真结果设计小型化、结构简单的超宽带高通滤波器,并制作实物进行测量,实测数据与仿真结果基本吻合。 相似文献
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介绍了一种带有缺陷地结构的互补型传导传输线带通滤波器结构,并对其进行了电磁仿真,得到比较好的结果.该结构在使用环形谐振器缩小器件尺寸的基础上,引入互补型传导传输线,使得滤波器保持性能良好的基础上进一步缩小尺寸."螺旋"形DGS结构用来抑制谐波效应,使得带通滤波器的整体性能得到显著优化.该滤波器在中心频率915 MHz处回波损耗达到20.5 dB,通带内最小插入损耗为1.9 dB,3 dB带宽为52 MHz.该带通滤波器便于在微波集成电路中使用,有利于实现设备的小型化. 相似文献
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提出了一种新型的基于缺陷地结构的双频带带通微带滤波器.缺陷地结构采用双模开口谐振环形式, 并使用不同组合方式的双模开口谐振环产生两个通带.滤波器的两个工作中心频率分别为3.5 GHz和5.8 GHz, 其中第一个频带涵盖了所有全球微波互联接入的应用频段, 第二个频带可以应用于雷达设备.为了进一步证实这款滤波器的性能, 基于Roggers RT5880板材制作了滤波器实物, 整体滤波器的大小仅为20 mm×20 mm, 测量数据和仿真结果吻合较好, 并且有两个传输零点, 可以满足工程上的需要. 相似文献
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Susanta Kumar Parui Tamosi Moyra Santanu Das 《International Journal of Electronics》2013,100(9):915-924
An asymmetric defected ground structure (DGS) with respect to a microstrip line is proposed. Its unit cell consists of two square slots connected with a rectangular slot by meandered transverse slots. The simulated, measured and equivalent circuit responses have been presented. The unit DGS pattern under microstrip line produces wide rejection bandwidth and high sharpness factor. Its elliptic band-reject filter response is modelled by appropriate LC equivalent circuit. Two such DGS cells under a microstrip line produce 3-pole quasi-elliptic bandstop filter response, which shows deeper attenuation without appreciable change in pole frequencies in comparison to single cell structure. Unit DGS pattern under coupled gap microstrip lines produces band-accept filtering characteristics. The frequency characteristics show a quasi-elliptic highpass filtering characteristics with sharp lower transition knee. Accordingly, an LC equivalent circuit is proposed. A cascaded band-accept and band-reject filter is proposed for designing a wideband bandpass filter. The bandwidth and centre frequency of the bandpass filter can be varied by choosing different set of DGS dimensions. 相似文献
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A compact common-mode filter is proposed to suppress common-mode noise for application of high-speed differential signal traces. The filter adopts one big C-shaped defected ground structure (DGS) cell in the left of ground plane and two small C-shaped DGS cells with opposite direction in the right of ground plane. Because these DGS cells have different dimensions, the filter has three adjacent equivalent resonant points, which can suppress wideband common-mode noise effectively. The left C-shaped DGS and its adjacent C-shaped DGS cell form an approximate closed structure, which can efficiently reduce the influence of the mutual capacitance. The filter provides a common-mode suppression from 3.6 GHz to 14.4 GHz over 15 dB while it has a small size of 10 mm10 mm. The fractional bandwidth of the filter is 120%, and the differential signals still keep good signal integrity. The experimental results are in good agreement with the simulated results. 相似文献
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提出了一种基于周期缺陷地结构的可集成毫米波加脊半模波导滤波器。该滤波器利用了波导的高通特性以及周期缺陷接地结构的宽带抑制特性,从而构建了有效的通带滤波器。测试表明,该滤波器的3 dB通带范围为39.4~45.4 GHz,中心频点为42.4 GHz,3 dB相对带宽为14.1%,带内最低插入损耗为2.4 dB,位于44.2 GHz,高频带外抑制在58 GHz达40 dB。该滤波器的横截面相比矩形波导滤波器减小了约64 %,有利于电路小型化、集成化。随着5G通信向毫米波频段发展,这种小型化毫米波滤波器在5G通信中有着广阔的应用前景。 相似文献
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Defected ground structures (DGS) have been developed to improve characteristics of many microwave devices. In this paper, using FDTD method, effect of DGS to mutual coupling reduction of a two-element microstrip antenna array is investigated. The proposed DGS antenna is compared to other techniques and is shown to have an exceptionally lower mutual coupling between two E-plane coupled elements. Impact of the designed DGS on higher-order modes and radiation pattern of the antenna array is also examined. 相似文献
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This article presents a compact microstrip dual-band bandstop filter (BSF), in which one λg/4 defected ground structure (DGS) pair is utilised to realise one stopband while two stepped impedance resonators (SIRs) help obtain another stopband and suppress the spurious harmonics. The design strategies and the equivalent circuits are introduced in detail. The measured results indicate 43.8% and 18.7% fractional bandwidth in the two stopbands (2.4 GHZ and 5.2 GHz) respectively, and the return loss is greater than 15 dB in the whole passband. In addition, size reduction can be conveniently achieved by adjusting the length of the SIRs and DGS. 相似文献
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Lin Li Zheng-Fan Li H.-X. Xia J.-X. Yang 《International Journal of Electronics》2013,100(8):1115-1121
A novel wideband bandpass filter with a very compact size is presented in this article. Using a side-coupled stepped impedance resonator, wideband characteristics with adjustable centre frequency and 3-dB fractional bandwidth can be obtained easily. Finally, a filter sample is designed and fabricated to provide an experimental verification on the proposed topology. Good insertion/return losses, flat group delay, wide bandwidth as well as ultra compact size are achieved as demonstrated in both simulation and experiment, which makes this filter a very promising candidate for applications in future wideband communication system. 相似文献