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介绍了一种P波段宽带双极化微带天线单元及2元阵列的设计。天线单元设计中采用口径耦合理论和多层贴片结构,增大了天线的带宽,两个极化端口采用共面馈电;馈电网络设计中采用反相馈电技术有效抑制了交叉极化,采用短路耦合线实现反相馈电,降低了对天线带宽的影响。仿真结果表明,该天线阵实际增益达到11.8dB,水平极化端口在0.68~0.86GHz频率范围内驻波比小于2,相对带宽为24%;垂直极化端口在0.63~0.86GHz频率范围内驻波比小于2,相对带宽为30.6%,两端口隔离度高于40dB。 相似文献
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设计了一种双频段双极化的阵列天线。该阵列天线采用多层微带天线形式,七层结构,通过口径耦
合和微带线边馈两种馈电方式实现双线极化,在辐射贴片上方增加寄生贴片以扩展带宽,实现双频段。天线工作在
12.25 ~12.75GHz 及14 ~ 14.5GHz,实测增益18dB 左右,隔离度大于40dB。该天线剖面低,重量轻,可作为子阵组
成更大规模的双频段双极化阵列。 相似文献
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介绍了一种L形探针耦合馈电的天线形式。天线为正交双极化贴片天线,每一个极化由双端口反相合成馈电,具
有隔离度高,工作频带宽,剖面低等特点。阻抗带宽可达25%,隔离度大于30dB,天线的最大高度小于23mm。该天线形
式在实际产品中得到了应用。 相似文献
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介绍了一种新型的Ku频段宽带高增益双极化微带贴片单元及96元阵列的设计。设计中单元采用层叠贴片天线结构,提高了单元的带宽和增益,两个极化端口采用分层馈电,其中水平极化端口采用共面馈电,垂直极化端口采用探针背馈。在馈电网络的设计中引入反向馈电技术,降低了交叉极化。仿真与实测结果表明:该阵列增益达到了26dBi,口径效率约为51%,交叉极化电平小于-30dB,水平极化端口相对阻抗带宽达11.3%,垂直极化端口相对阻抗带宽达13.7%,两端口隔离度高于40dB. 相似文献
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小型化和宽轴比带宽是双圆极化天线设计领域的研究热点。文章设计了一款馈电结构简单,天线尺寸较小的双圆极化微带天线。天线利用同轴电缆双端口馈电,在介质板上下两层对称分布的两个哑铃型贴片,分别辐射右旋圆极化(RHCP)波和左旋圆极化(LHCP)波。在天线的基础上,添加寄生贴片,通过天线互耦作用,改善了天线的匹配和增益情况。经仿真分析,此天线实现了48%的工作带宽和13%的轴比带宽,具有工作频带宽,可实现双圆极化,结构简单以及尺寸小型化的特点。 相似文献
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介绍了一种小型宽带宽波束圆极化微带天线设计。该天线采用双层短路贴片,通过旋转结构设计结合多点馈电技术,实现了微带天线的宽带宽波束圆极化辐射。仿真与测试结果表明:VSWR〈2的阻抗带宽为15.9%(1.45~1.7 GHz),半功率波束宽度和3 dB轴比波束宽度在8.6%(1.45~1.58 GHz)的频带内均大于100°,天线尺寸仅为0.43λ×0.43λ×0.035λ。 相似文献
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Kaneda N. Deal W.R. Yongxi Qian Waterhouse R. Itoh T. 《Antennas and Propagation, IEEE Transactions on》2002,50(8):1158-1160
A novel broadband planar antenna based on the classic Yagi-Uda dipole array is presented. This "quasi-Yagi" antenna achieves a measured 48% bandwidth for VSWR <2, better than 12 dB front-to-back ratio, smaller than -15 dB cross polarization, 3-5 dB absolute gain and a nominal efficiency of 93% across the operating bandwidth. Finite-difference time-domain simulation is used for optimization of the antenna and the results agree very well with measurements. Additionally, a gain-enhanced design is presented, where higher gain has been achieved at the cost of reduced bandwidth. These quasi-Yagi antennas are realized on a high dielectric constant substrate and are completely compatible with microstrip circuitry and solid-state devices. The excellent radiation properties of this antenna make it ideal as either a stand-alone antenna with a broad pattern or as an array element. The antenna should find wide applications in wireless communication systems, power combining, phased arrays and active arrays, as well as millimeter-wave imaging arrays. 相似文献
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The design, fabrication, and experimental implementation of the one-patch microstrip antenna coupled with an H-shaped aperture are presented. The presented antenna has a wide bandwidth, high gain, and low cross-polarisation levels with only one-patch. The measured bandwidth of this antenna is 56.2% for the voltage standing wave ratio ⩽2.0. The cross-polarisation level is below -18.2 dB at the E-plane and below -25.7 dB at the H-plane. The maximum gain at 2.05 GHz is 10.4 dBi and the 3 dB gain bandwidth with a centre frequency at 2.17 GHz is 24% 相似文献
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Coplanar waveguide fed quasi-Yagi antenna 总被引:1,自引:0,他引:1
A novel coplanar waveguide fed quasi-Yagi antenna is presented. A wide bandwidth is achieved by using a broadband coplanar waveguide to a slotline balun. An X-band prototype has been realised which demonstrates a broad bandwidth (30%), -19 dB front-to-back ratio, and cross-polarisation better than -17 dB at 10 GHz. 相似文献
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Yao Demiao Cai Jianming Jiang Mingzhi 《电子科学学刊(英文版)》1997,14(1):68-74
A novel three layers microstrip antenna element that has the advantages of wideband and high-gain is proposed. The eigenvalue equation and the frequency characteristic formulas of the input Voltage Stand Wave Ratio ( VSWR ) are obtained by using the spectral domain method and equivalent circuit method, respectively. With the aid of the numerical results, a C-band microstrip antenna element with bandwidth of 16% (VSWR<1.5) or 25% (VSWR<2) and gain of 10.2-11.3 dB is developed, which are much larger than the bandwidth of 5-6% and the gain of 6-7 dB of the common microstrip antenna element. 相似文献
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This article presents a theoretical and experimental study of the design of a miniaturized wideband dielectric-filled waveguide (DFW) antenna. The operational frequency is X band, i.e., 9.0⩽f⩽10.5 GHz. The desired bandwidth is 1.5 GHz. The antenna uses an air-gap matching network to reduce its high aperture reflection. In order to ease the integration with antenna circuits and to increase the bandwidth, two E-plane steps are used. The antenna is designed to have -3 dB beamwidths of 60° and 100° for the E- and H-plane patterns, respectively. An input reflection of less than -10 dB for the desired bandwidth is observed. The gain of the antenna is 7 dBi. A cross-polar level of less than -25 dB is achieved. This article discusses the mathematical model for input reflection, the design scenarios, and the experimental results 相似文献
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研究设计了一款低剖面、宽带、高增益、低副瓣的定向平板天线。为了实现低剖面,采用了宽带微带天线单元、馈电网络等设计,定向天线整体采用印制板;为了实现低副瓣,采用阵列天线与馈电网络的一体化设计,用多层印制板加工技术实现天线单元间不等幅度的馈电精度,尽可能减少人工装配步骤,以降低装配误差。文中对设计的低副瓣定向天线进行了加工测试。测试结果表明,所研制天线的阻抗带宽为26.1%。在阻抗带宽范围内,可以实现最大增益大于23.6 dBi、E面和H面的副瓣电平分别小于-27.4 dB和-28.3 dB、前后比小于-42.2 dB。 相似文献
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提出了一种基于缝隙耦合超材料表面的低剖面圆极化高增益天线,该天线由一个超材料表面和一个微带缝隙天线紧贴着组成. 通过改变超表面切角的大小来产生圆极化波,同时还可以提高天线增益和拓宽阻抗带宽. 为了验证仿真结果,制作和测量了一个大小为1λ×1λ×0.067λ(在10 GHz处)的样本天线,仿真和测量结果显示出良好的一致性. 结果表明,在整个工作带宽内天线的增益均在7.5 dB以上,最大增益达到10.5 dB,比普通缝隙天线提高了5.3 dB,阻抗带宽(S11 < ?10 dB)为27.4%,轴比带宽(AR < 3 dB)达到12.3%. 因此,该天线能同时满足低剖面、圆极化、高增益等多种性能的要求,可以应用于许多领域. 相似文献
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基于FR4环氧板,设计了一种可用于体域网的非对称共面波导馈电的超宽带天线。该天线由Y型贴片、梯形地板和三叉戟共面馈线组成。Y型贴片、圆形贴片、三角形贴片实现4~5 GHz的中低频处带宽小于-10 d B的效果,梯形地板和三叉戟共面馈线实现7~14 GHz的高频处带宽小于-10 d B的效果。该天线采用非对称共面波导的馈电方式,具有良好的共面性与高度的集成性,使得天线的总体尺寸更小,辐射贴片的面积为22 mm×21 mm。与以往的小型化超宽带天线相比,该天线具有尺寸更小、带宽更宽的优势。经网络矢量分析仪测试结果表明,该天线在2. 14~11. 32 GHz的超宽带频段内回波损耗小于-10 d B(相对带宽为136. 4%),可适用于2. 4/5. 2/5. 8 GHz无线局域网、3. 5/5. 5 GHz WiMAX、LTE频段38和LTE频段40。同时,该天线距离人体大于5 mm时的比吸收率(SAR)小于2 W/kg,满足国际标准。 相似文献