共查询到18条相似文献,搜索用时 62 毫秒
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螺旋天线的快速分析及宽带化设计 总被引:3,自引:3,他引:0
研究了一种快速计算螺旋天线电特性的新方法,并结合遗传算法对天线进行了宽带、小型化设计。采用直线段对法向模螺旋天线进行划分,应用合成基函数及合成检验函数的矩量法对阻抗矩阵进行了降阶处理,节省了求解矩阵方程所需的时间和存储量。结合遗传算法对加载法向模螺旋天线上的加载集总元件的值、加载位置以及匹配网络参数进行一体化优化设计,并采用Sherman-Morrison-Woodbury公式快速求解加载后的矩阵方程,提高了优化设计的效率。最后,成功设计了一副工作在100~1000MHz的宽带小型化螺旋天线。 相似文献
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本文研究一种应用于卫星通信系统车载移动站的走向圆极化天线——双臂微带螺旋天线,文中应用二次曲线段三角基函数展开的矩量法对天线的各项电性能指标作了数值计算,为天线的设计和调整提供了充分的理论依据和切实可行的思路和方法。 相似文献
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用矩量法得到螺旋天线的电流分布,并在此基础上进一步确定了螺旋天线的近场分布.提出了用来度量线天线近场耦合强度的一种方法.针对螺旋天线的近场计算并描绘出了耦合度随收发间距变化的曲线图. 相似文献
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微带天线全波频域法中的小波应用 总被引:2,自引:0,他引:2
本文将小波分析引到微带天线全波频域法的计算中,对矩形微带贴片天线感应电流矩量法的小波计算进行了理论推导。对一矩形微带贴片天线进行了实际计算,并与用脉冲基函数和三角形基函数进行计算得到了结果进行了比较。 相似文献
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Xia Dongyu Zhang Hou Wang Chong Zhang Qianyue 《电子科学学刊(英文版)》2007,24(3):402-405
A novel ellipsoidal helical antenna is proposed and studied in this letter. As a special instance, the hemispherical helical antennas are analyzed firstly, which indicates that the characteristics of a two-arm unit are better than that of a single-arm unit. Based on this, the ellipsoidal helical antenna, formed by changing the axial direction's dimension of the two-arm hemispherical helical antenna, is analyzed by the moment method with curved basic and testing function. The effects to VSWR (Voltage Standing Wave Ratio), gain, polarization and patterns by the axial direction's dimensions are investigated. The study results provide dependable gist to the choice of antenna format according to the practical requirements. 相似文献
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Ufuk Kilic Matthew Hilfiker Alexander Ruder Rene Feder Eva Schubert Mathias Schubert Christos Argyropoulos 《Advanced functional materials》2021,31(20):2010329
Designing broadband enhanced chirality is of strong interest to the emerging fields of chiral chemistry and sensing, or to control the spin orbital momentum of photons in recently introduced nanophotonic chiral quantum and classical optical applications. However, chiral light-matter interactions have an extremely weak nature, are difficult to control and enhance, and cannot be made tunable or broadband. In addition, planar ultrathin nanophotonic structures to achieve strong, broadband, and tunable chirality at the technologically important visible to ultraviolet spectrum still remain elusive. Here, these important problems are tackled by experimentally demonstrating and theoretically verifying spectrally tunable, extremely large, and broadband chiroptical response by nanohelical metamaterials. The reported new designs of all-dielectric and dielectric-metallic (hybrid) plasmonic metamaterials permit the largest and broadest ever measured chiral Kuhn's dissymmetry factor achieved by a large-scale nanophotonic structure. In addition, the strong circular dichroism of the presented bottom-up fabricated optical metamaterials can be tuned by varying their dimensions and proportions between their dielectric and plasmonic helical subsections. The currently demonstrated ultrathin optical metamaterials are expected to provide a substantial boost to the developing field of chiroptics leading to significantly enhanced and broadband chiral light-matter interactions at the nanoscale. 相似文献
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本文叙述了背射模螺旋天线的频率响应理论。基于电流行波的假设,求解了远区场的近似解析解。结果与Nakano的数值解基本一致,笔者应用该理论研究了以背射模螺旋作为馈源,导体圆板作反射器的新型天线的辐射特性。取得了具有实用意义的结果。 相似文献
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螺旋波纹波导回旋行波管的模式耦合机制 总被引:1,自引:0,他引:1
从波导的等效边界条件出发,结合波导的激发方程组,通过数学推导说明了螺旋波纹波导回旋行波管的模式耦合机制。TE1,1模会在螺旋波纹波导中耦合出TE-2,1模,并且通过计算说明TE-2,1模主要和TE1,1模的空间-1次谐波发生耦合。 相似文献
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本文报道了螺旋氙泵浦宝石激光器的特性,获得斜率效率0.078%、最大能量148.3毫焦的激光输出。并对不同实验条件下激光输出结果作了实验研究和定性分析。 相似文献
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