共查询到19条相似文献,搜索用时 492 毫秒
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《现代电子技术》2017,(5):93-96
根据电磁材料的相关理论,设计出一种由新型谐振器和金属线组成的电磁双负超材料,即介电常数和磁导率同时为负的电磁材料。新型谐振器通过较小谐振腔并联的方式,在较大的单元尺寸下提高了谐振频率,既使该电磁超材料在K波段实现了双负特性,又保证了材料的辐射面积,克服了高频段超材料由于尺寸太小而难以应用的困难。设计出一种K波段的微带天线,将新型谐振器加载在天线上,并用HFSS软件对未加载谐振器和加载谐振器的天线进行仿真对比。仿真结果表明,相比普通天线,加载新型谐振器的微带天线性能得到明显提升,驻波比2 d B以下的带宽增加了58.3%,增益变大,并且由于谐振器对天线副瓣的抑制,提高了天线的方向性。 相似文献
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微带天线易于产生谐波辐射,造成功率的损耗。加入DGS的微带天线可以抑制谐波,但是普通DGS会增加天线的背向功率漏射,且接地板利用率较低,分形DGS可以很好地克服这些缺点。为了缩短DGS的设计周期,采用BP神经网络对DGS进行进建模,在此基础上分析设计了一种分形DGS微带天线,并对制作的实物进行了测量,测量结果与仿真结果吻合较好,证明了该神经网络模型的正确性和分形DGS在微带天线谐波抑制中的有效性。 相似文献
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基于双面对称单环开口谐振器对结构奇异的电磁特性,设计了一种频率可控的各向异性零折射超材料。将这种零折射超材料应用于普通双频微带天线,制备了中心频率为5. 15GHz 和6. 8GHz 的零折射双频微带天线。仿真和测试结果显示,由于零折射超材料的引入,天线的侧向辐射减弱,方向性增强。在低频工作时,零折射微带天线E 面和H 面半功率波束宽度分别减小了29°和10°,增益提高了2. 2 dB。在高频工作时,零折射微带天线E面和H 面半功率波束宽度均减小了16毅,增益提高了2. 4 dB。将零折射超材料应用于微带天线的介质基板,为高性能双频微带天线设计提供了有效途径。 相似文献
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邵建兴 《中国电子科学研究院学报》2010,5(1):36-39
针对传统微带天线低频端尺寸较大的缺点,设计了一种基于光子晶体的新型微带天线结构,即通过采用在传统微带天线贴片下方挖出凹槽,将辐射板放入凹槽中,并在微带天线的介质基板中引入高度不同的周期性圆柱空气隙光子带隙(PBG)结构的设计方案。采用基于有限元方法的电磁仿真软件HFSS 10.0对所设计的天线进行了仿真。仿真结果表明,当回波损耗小于-10.0dB时,天线的工作频段分别为2.40GHz~2.51GHz和3.54GHz~3.62GHz,且天线在这两个频段内具有良好的辐射特性。与传统的微带天线相比,所设计的天线后向辐射明显降低,且其整体尺寸减少了59.19%,从而验证了这种设计方案的有效性。 相似文献
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针对微波无线输能系统中接收天线质量轻、体积小、剖面低、易与微波电路集成的特点,设计了一款新型的具有谐波抑制功能的宽带圆极化宽缝接收天线。通过在长方形缝隙中添加末端具有圆形贴片的交叉结构实现圆极化性能,添加切角结构展宽圆极化带宽。在馈线上添加具有一定长度的开路支节,配合使用缺陷地结构共同实现谐波抑制功能。研究并测试了天线的反射系数、轴比、增益以及远场辐射方向图,仿真与实测基本吻合。仿真结果显示,该天线很好地抑制了基频5.8 GHz的二次谐波和三次谐波,在4.5~6.2 GHz的范围内S11<-10 dB,相对阻抗带宽31.8%;基频5.8 GHz处的轴比AR=1.3 dB,在频率范围4.2~6.15 GHz内轴比AR<3 dB,相对轴比带宽37.7%;基频5.8 GHz仿真增益6.7 dB。 相似文献
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介绍了一种利用逆开环谐振器实现微带天线谐波抑制的方法.在传统逆开环谐振器的开口处添加一对缝隙,可有效的降低传输零点的位置.提出了加载逆开环谐振器微带线的等效电路模型,电路模型结果与仿真结果相吻合,证明了所提电路模型的正确性,并从等效电路模型的角度分析了传输零点下降的原因.将不同传输零点的结构单元级联起来制作在微带线的接地板上,很好地实现了微带天线的谐波抑制.仿真结果与测试结果相吻合,证明了所采用方法的有效性和正确性.该设计方法结构紧凑,简单易行. 相似文献
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具有二次Koch分形边界的圆极化微带天线 总被引:1,自引:0,他引:1
设计了一种单馈点圆极化微带天线。微带贴片采用二次Koch分形边界的贴片结构,通过底馈方法激励起两个相互正交的简并模实现圆极化;采用CSTMicrowaveStudio@软件进行了仿真,其结果表明,在微带贴片的对角线上适当位置用探针馈电,可以实现圆极化辐射。对具有介质损耗的天线进行了仿真,结果与理想介质的差异较大。设计了一个右旋圆极化微带天线,并进行了测试。该天线工作于1.575GHz;VSWR小于2的阻抗带宽为51MHz;轴比为4dB;增益为3.8dB;贴片尺寸为42.4mm×42.4mm,可以用作GPS天线。 相似文献
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New wideband microstrip antenna using log-periodic technique 总被引:3,自引:0,他引:3
A novel wideband microstrip antenna using a series-fed linear array of patch resonators in a log-periodic arrangement is described. A 9-element example gives good input v.s.w.r. and radiation control over a 30% bandwidth with better than 70% efficiency. The new array configuration gives wider bandwidth than single-layer or stacked microstrip patches combined with better efficiency than patches on lossy substrates or microstrip spirals. 相似文献
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Broad-band microstrip antennas using additional resonators gap-coupled to the radiating edges 总被引:1,自引:0,他引:1
A method for increasing the bandwidth of microstrip patch antennas by incorporating two additional resonators which are gap-coupled to the radiating edges of a rectangular patch is described. A two-dimensional analysis using Green's function and segmentation method is used for analyzing the proposed antenna configurations. A bandwidth as large as five times a single rectangular patch is obtained inS -band. Changes in the radiation pattern over this wide bandwidth are discussed. Experimental results are in reasonable agreement with the analysis. 相似文献
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Center-fed microstrip patch antenna 总被引:1,自引:0,他引:1
A novel feeding scheme for microstrip patch antennas is presented, which consists of a coaxial probe and shorting pin separated by a narrow slot centrally cut at the radiating patch. The impedance and radiation characteristics of a conventional probe-fed microstrip patch antenna and the proposed microstrip patch antenna are experimentally examined and compared. The effects of the slot length on the antenna operation are also discussed. 相似文献
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A wide-band single-layer patch antenna 总被引:3,自引:0,他引:3
The typical single-layer patch printed on a dielectric substrate is a narrow-band element. This well-known fact is mainly due to the limitations imposed by the dielectric substrate. From efficiency and cost considerations, in most of the cases, the substrate cannot be too thick. In order to increase the microstrip element bandwidth, additional resonators in different configurations and combinations can be used: parasitic elements, slots, etc. However, the microstrip antenna element with the widest bandwidth (a variation of the aperture-fed stacked-patch element) is about 40-50%. This antenna, an aperture-fed stacked patch, has a relatively poor front-to-back ratio, due to the fact that it has a slot in the ground plane. In this paper, a new type of patch element is presented. The patch is suspended over the ground plane and supported by a nonconductive pin. It is fed by a three-dimensional (3-D) transition connecting the patch to a perpendicular connector. The typical bandwidth of this element (in terms of VSWR) is 90%. When built on a large ground plane, the front-to-back of this element is better than 25 dB across the band 相似文献
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新型光子带隙微带贴片天线 总被引:2,自引:1,他引:1
提出一种新型光子带隙(PBG)结构微带贴片天线。在同轴线馈电型微带贴片天线的接地板上蚀刻出新颖PBG结构,通过数值仿真得到有效提高增益的结构。实际制作了PBG结构微带天线,并实测了天线特性参数。数值结果和实验结果进行了比较,取得了较为一致的结果.实测天线增益达8.8dB,比无PBG时提高约3dB,验证了该PBG结构的有效性。 相似文献
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