共查询到20条相似文献,搜索用时 109 毫秒
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微带贴片天线上的电流分布与它的工作模式、谐振频率有直接关系.通过分析微带天线贴片表面的电流分布来优化微带天线的结构,从而使天线性能满足要求,这种方法直观、有效,在国内外已被广泛采用.文中由规则矩形贴片的谐振频率和该贴片上的电流分布出发,探讨在保持电流路径长度不变的情况下,贴片形状的变化对谐振频率的影响,从而找到应用电流路径法设计多波段天线的更一般性的规律. 相似文献
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设计了一种加载U型缝的小型化分形结构微带天线。该天线应用Giuseppe Peano分形理论和U型缝加载技术,延长电流的有效路径,从而降低天线的谐振频率,实现天线小型化,同时采用空气作为介质层,减小天线的Q值,增加天线带宽。通过使用HFSS对天线进行仿真优化,得到了天线尺寸参数。仿真结果表明,天线的相对带宽为6%(3.47~3.71 GHz),最大增益可达2.91 dBi,整体辐射性能良好。天线贴片尺寸仅为14 mm×14 mm,相比于普通微带天线,面积缩减了59%。该天线结构简单,尺寸小,能较好地适用于WiMAX通信。 相似文献
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给出了一种基于光子晶体接地板的新型微带贴片天线.这种微带贴片天线被置于具有二维光子晶体接地板的介质基片上,此结构能够有效地阻止表面波的传输.利用Ansoft公司的高频电磁场仿真软件HFSS研究了该光子晶体材料的阻带位置和阻带带宽,以及这种光子晶体微带天线的输入反射损耗和方向图等重要参数,并与普通微带贴片天线进行了比较,结果表明,光子晶体结构增大了微带天线的工作带宽,提高了前向辐射的增益. 相似文献
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随着现代无线通信系统的发展,对天线也提出了一些特定的更高的要求。设计了一种S频段宽波束圆极化微带天线,以满足系统对天线宽波束辐射的要求;在天线的辐射贴片上附加寄生贴片以展宽天线带宽,并利用金属化过孔以实现单边短路,达到天线小型化设计的目的;利用旋转结构结合多点馈电技术以获得微带天线宽波束圆极化辐射。通过理论分析并利用三维电磁仿真软件HFSS对天线进行了仿真设计和实验,仿真结果与测试结果吻合良好。 相似文献
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一种基于PBG结构的多频微带天线的分析与设计 总被引:1,自引:0,他引:1
在C型缝隙微带天线介质基板内引入光子晶体结构,设计了一种基于PBG结构的多频微带天线,此天线采用在C型缝隙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三角柱空气隙PBG结构的设计方案.采用基于有限元方法的电磁仿真软件Ansoft HFSS10.0对所设计的天线进行了仿真.与普通... 相似文献
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Aanandan C.K. Mohanan P. Nair K.G. 《Antennas and Propagation, IEEE Transactions on》1990,38(10):1581-1586
A microstrip antenna with large bandwidth is developed using a parasitic technique. Compared to the available wideband antennas, the proposed antenna structure is very compact and gives a less distorted radiation pattern with frequency. An impedance bandwidth eight times that of a conventional patch antenna of the same size is achieved. The concept of coupled microstrip line model is extended for theoretical interpretation of the impedance loci. The experimental procedure and results are described, and a theoretical analysis is presented 相似文献
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针对当前已有超宽带(ultra-wideband, UWB)微带单极子天线带宽窄、尺寸大等缺陷,设计了一款小型化UWB阶梯形微带单极子天线,采用开槽的矩形辐射贴片、阶梯形微带馈电线和缺陷地面结构(defected ground structure, DGS)实现良好的UWB特性. 对天线的回波损耗、电压驻波比(voltage standing wave ratio, VSWR)、辐射方向图及增益进行了仿真计算和优化设计,实测显示,天线的工作频段为2.6~22.1 GHz,增益最大值为12.9 dBi,仿真和实测结果基本吻合. 所设计天线结构简单、覆盖频率广、尺寸小、工作频带内具有良好的辐射特性,表明该天线适用于各种UWB通信系统中. 相似文献
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Kaushik Mandal Partha Pratim Sarkar 《AEUE-International Journal of Electronics and Communications》2013,67(12):1010-1014
In this article, we describe a novel type of defective ground surface (DGS) microstrip antenna that achieves higher gain, multi resonant frequency with compact size. The proposed antenna consists of a hexagonal shaped patch with small volume. Six triangular slots have been cut on the ground plane, just below the six corners of the hexagonal radiating patch. Antenna is circularly polarized one and it has the measured peak gain of 7.2 dBi. The antenna shows multi frequency behavior and more than 57% compactness compare to the conventional hexagonal patch antenna. The simulated results are confirmed experimentally. The proposed antenna is simple in structure compared with the regular stacked or coplanar parasitic patch antennas. It is highly suitable for wireless communications. 相似文献
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The development of a compact broadband microstrip antenna configuration is presented. The system uses a number of parasitic elements which are gas-coupled to a driven patch. The enhancement of bandwidth does not cause deterioration of the radiation pattern of the system. 相似文献
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Hong-Twu Chen Horng-Dean Chen Yuan-Tung Cheng 《Antennas and Propagation, IEEE Transactions on》1997,45(11):1581-1583
In this paper, an annular-ring loaded (ARL) spherical-circular microstrip antenna is studied theoretically. The antenna is excited by a coaxial probe. The theoretical formulation is based on full-wave analysis in the spectral domain by using the vector Legendre transform and Galerkin's moment method is used for numerical calculation. Numerical results of the resonance frequencies, input impedance, voltage standing wave ratio (VSWR), and radiation characteristics are presented. It is shown that the impedance bandwidth of the spherical-circular microstrip antenna can be broadened by adding an annular-ring parasitic patch. By comparing to the single circular-patch case the spherical-circular microstrip antenna with an annular-ring parasitic patch has larger minor lobes and larger cross-polarization radiation 相似文献
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本文在比较了一些微带天线实现双极化思路后,提出了一种新型高极化隔离度和低后向辐射的双极化微带贴片结构:即在口径耦合单元的馈线上增加一对对称寄生微带线调节枝节,进行匹配阻抗和实现高极化隔离度,并利用H形口径耦合,减小贴片单元的后向辐射,提高天线的辐射效率。该结构简单,调节简便,馈线网络占有面积较小,且易做成更大规模的双极化天线阵,非常适合现在高分辨率双极化合成孔径雷达和抗多径干扰高的移动通讯系统的需要。文中给出了仿真和实测结果,吻合较好,从而证明了设计的有效性。 相似文献
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Jui-Han Lu Hung-Chin Yu Kin-Lu Wong 《Electronics letters》1998,34(21):1989-1990
A novel compact circular polarisation (CP) design for a single feed equilateral-triangular microstrip antenna with inserted spur lines at the patch edges is presented. It is found that, with increasing spur-line length, the resonant frequency of the triangular microstrip patch is significantly lowered. Also, by further adjusting the inserted spur lines to have a length ratio of ~0.96, the proposed design can achieve CP radiation at a much lowered operating frequency, resulting in compact triangular microstrip antennas with circular polarisation 相似文献
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Ki-Hak Kim Seong-Ook Park 《Antennas and Propagation, IEEE Transactions on》2006,54(6):1688-1692
A novel band-rejected ultrawideband antenna with one parasitic strip is presented in this paper. It is designed to work on a substrate FR4 that has a thickness of 1 mm and relative permittivity of 4.6, and to operate from 3 to 17 GHz. The proposed antenna is fed by microstrip line and utilizes the parasitic strip to reject the frequency band (5.15-5.825 GHz) limited by IEEE 802.11a and HIPERLAN/2. The size of the antenna is 20/spl times/20 mm/sup 2/ and this antenna has good radiation characteristics. Effects of varying the location and length of the parasitic strip and the structure of the ground and monopole patch on the antenna performance have also been studied. 相似文献
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该文设计了一种具有四陷波及可重构特性的超宽带天线。通过在天线辐射贴片、微带馈线上刻蚀U形槽,以及在改进型地板上添加环形开口寄生单元来实现天线四陷波特性。采用在陷波结构中加入PIN二极管开关的方法实现陷波可重构特性,通过开关的断开与闭合,分别实现三陷波和四陷波特性,从而进一步提高了超宽带频段的利用率。分析了天线陷波产生的原理,研究了天线部分尺寸参数对陷波的影响。通过仿真和实物测量结果对比表明,该天线在3~11.74 GHz频段内可有效抑制窄带系统的干扰。天线尺寸为24 mm×16 mm×0.8 mm,结构较紧凑,可广泛用于各种超宽带通信系统。 相似文献