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讨论与辐射特性相关的楔形平面波导的设计问题,对于渐变波导光栅输入Bloch模转换成平面输入波,其辐射能量绝大多数集中在干涉m=0级Brillouim区中,设计了一最佳阵列波导,得到最佳条件、结构参数,讨论了影响传输效率的因素,并进行了仿真计算.(OD3) 相似文献
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非对称单脊波导的FD-TD分析 总被引:2,自引:0,他引:2
本文针对一种新颖的相控天线阵辐射单元-非对称单脊波导共线缝隙阵,用FDTD方法对这种三维非均匀结构的特性进行了深入的研究。得出其场分布、波导波长及其作为基本辐射单元的辐射特性,给出了上述特性和波导非对称之间的关系曲线;所得的结果对宽角扫描的大型平面缝隙相控阵的设计有重要参考价值。 相似文献
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Ti:LiNbO3单模波导的设计和参数选择 总被引:1,自引:0,他引:1
波导参数的选择是设计和制造高质量的平面波导器件的关键。本文推导了二维扩散波导的参数和初始参量之间的模式截止条件。并引用了半经验数据(或公式),增加了理论设计的工艺可靠性和可控性。证实了设计原则的有效性。 相似文献
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首先提出了一种新结构共面波导馈电的小型平面超宽带(UWB)天线,该天线类似一般的共面波导馈电宽缝隙天线,为了获得超宽带工作特性,设计方案中采用了叉状结构的调谐支节,并将其辐射缝隙设计为多边形;通过数值计算研究了某些尺寸参数对天线输入特性的影响,在计算的基础上通过大量的实验详细研究了天线的频域工作特性,然后对其时域瞬时脉冲信号保真度特性进行了数值分析。计算与实验的结果表明,该天线具有超过3.2∶1的工作带宽和全向辐射特性,而且具有较好的线性相位传输特性和脉冲信号保真度,是一种有实用意义的超宽带天线。 相似文献
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综述了平面漏波天线最近的发展情况。主要介绍了微带漏波天线和基片集成波导(SIW)漏波天线,探讨了这些漏波天线的工作模式,介绍了这些天线的理论分析与设计方法,描述了这些天线的传播特性及辐射特性。 相似文献
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一种车载对数周期阵列天线的结构设计 总被引:1,自引:1,他引:0
对车载对数周期阵列天线(LPDA)结构设计方案进行了详细论述。阵列天线整体外形成四棱锥状,由4个对数周期天线单元按同一角度阵列而成,每个对数周期天线单元的集合线作为四棱锥的四条棱。使用Pro/E对其进行了实体造型,对空间阵列天线关键部件进行了静力分析。为了验证其安全性,对其强度和刚度进行校核,在此基础上完成了空间阵列天线的结构设计。阵列天线工作可靠,结构紧凑,便于车载拆装,很好地满足了预期的使用性能要求。 相似文献
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阵元数太多导致前视阵列SAR系统天线成本高和设计复杂,如何以较少的阵元数获取较高的成像质量是前视阵列SAR系统面临的重难点问题.根据系统成像质量要求,结合波束扫描、栅瓣抑制等技术,本文提出一种稀疏收发天线阵的设计方法.理论分析和仿真实验结果表明,该方法在保证一定成像质量的前提下,有效降低了阵元数量,提高了系统信噪比,具有一定的应用价值. 相似文献
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利用阵列流形的微分几何作为分析工具,构造了实际使用中常见的平面天线阵的几何结构,并对这些阵列结构的测向精度进行了研究和全面仿真。通过比较各种天线阵几何结构的优劣,可以从中选择一种合适的、最优的阵列结构,避免设计的盲目性和随意性。这为超分辨阵列结构的选择和设计提供了一条有效的途径,在实际应用中将具有十分重要的参考价值。 相似文献
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频率分集阵列(Frequency Diverse Array, FDA)雷达其波束具有时间 距离-角度三维相关性,使其在主瓣干扰抑制、欺骗干扰、真假目标识别等领域有着传统相控阵雷达无法比拟的优势。阵列结构和非线性频控函数设计是实现FDA辐射能量空间聚焦的主要方式。考虑到现有基于一维线阵的研究文献中较少有关于不等间距阵列的特性分析,本文将密度锥削阵与FDA结构相结合,仿真验证了密度锥削阵FDA与相控阵(Phased Array, PA)、一维均匀线性FDA(Uniform Linear Array FDA, ULFDA)、对数FDA(log-FDA)相比的阵列性能优势。同时,仿真分析了密度锥削阵FDA间距递增因子、非线性频控函数设计对其阵列方向图的性能影响。 相似文献
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S. E. Bankov G. G. Grachev M. D. Duplenkova E. V. Frolova 《Journal of Communications Technology and Electronics》2014,59(6):504-522
A multibeam integrated reflector antenna operating in the millimeter wave band is considered. The antenna consists of a radiating array, a planar mirror, and a multichannel feed. The results of simulation of a radiating array of slots in a metal screen are presented. The array is manufactured on the basis of a medium with forced refraction, including a double-slot array, which can radiate along the normal to the array plane. Operation of the array in the multibeam mode is analyzed. It is shown that application of a medium with forced refraction increases the array aperture efficiency in this mode. The results of the design of a planar two-layer mirror are presented and the mirror’s quality indices are estimated. A multichannel radiator designed as an array of planar H-plane horns is studied. The results of simulation of such a radiator with the help of an approximate technique and numerical solution of an electromagnetic problem are considered. The design of the multibeam antenna and its experimental characteristics are presented. 相似文献
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The theory and design of systolic arrays for Viterbi processing in communication systems with a time-dispersive time-varying channel is discussed. The architecture, algorithms, and processor elements, for a two-dimensional systolic array are described. The array supports the branch metric computations required for an adaptive Viterbi processor. The array is designed so that computations propagate along the rows of the array, while data symbols propagate along the columns. All interprocessor data flow and connections within the array are nearest-neighbor. The array illustrates how the Viterbi-processor algorithms can be structured to achieve a high degree of computational concurrency. Variations in the array design are described and evaluated in terms of computational resource requirements and utilization and computational throughput. A high-bandwidth memory interface is proposed, and system design considerations are discussed 相似文献
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S. E. Bankov L. I. Pangonis E. V. Frolova 《Journal of Communications Technology and Electronics》2010,55(11):1208-1222
Problems of the design of a centimeter-band antenna array containing a multichannel power divider based on EBG waveguides and helical radiators are considered. The general configuration of such an array is proposed. The properties of this array and the requirements on the array elements are analyzed. Features of the design of two-channel and four-channel elementary power dividers forming the multichannel power divider are studied. The structure and the parameters of these devices are determined. The array input part is designed in the form of a coaxial-to-waveguide transition (CWT) with equal power division. The CWT characteristics obtained with the use of numerical simulation are compared with experimental data. The results of the experimental investigation of a 16-element thinned antenna array in the frequency band 8–10 GHz are presented. 相似文献