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2008 12th International Conference on Mathematical Methods in Electromagnetic Theory最新文献

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Circular Polarized Rectangular Dielectric Resonator Antenna using single probe feeds 使用单探针馈源的圆极化矩形介电谐振器天线
S. A. Malekabadi, S. M. Moghadasi
In this paper rectangular dielectric resonator antennas (RDRAs) which providing circular polarization (CP) using single probe feeds are studied. A new technique for CP achievement is presented. This technique proposed that by modifying the RDRAs in suitable way, the fundamental mode of conventional rectangular DRA splits into two near-degenerate orthogonal resonant modes and CP is obtained. The proposed antennas are numerically investigated using finite element method (FEM). The investigation indicates that the radiation patterns of all antennas are remaining broadside throughout the bandwidth.
本文研究了采用单探针馈源提供圆极化的矩形介质谐振器天线。提出了一种实现CP的新技术。该技术提出,通过对rdra进行适当的修饰,将传统矩形DRA的基模分裂为两个近简并正交谐振模,从而得到CP。采用有限元法对所提出的天线进行了数值研究。研究表明,在整个带宽范围内,所有天线的辐射方向图都保持在宽侧。
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引用次数: 9
Enhanced transmission phenomenon from the eigenoscillation point of view 从本征振荡的角度看增强传输现象
N. Don, A. Kirilenko, A. Perov
Eigenoscillations of corresponding waveguide and periodic open resonators have been studied for explanation of the enhanced transmission through irregularities with below-cutoff holes. It has been found that the origin of the discovered effects is in the existence of the eigenoscillations of the interface between the free halfspace and the metal halfspace perforated with double-periodic set of channels or the eigenoscillations of waveguide plane junction.
研究了相应波导和周期开放谐振腔的本征振荡,以解释具有下截止孔的不规则增强传输。发现这些效应的根源在于自由半空间与双周期通道的金属半空间之间界面的本征振荡或波导平面结的本征振荡的存在。
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引用次数: 0
Transient radiation from the open end of circular waveguide 圆波导开口端的瞬态辐射
O. Dumin, O. Dumina, V. Katrich
The transient radiation from the open end of a circular waveguide is considered by analytical and direct numerical methods. The radiation of short pulse from the aperture is considered by calculation of special time form of field by means of modal basis method. The method permits to solve the problem of pulse evolution for positive and negative time with the use of Laplace transform by construction of operator of propagation. The method of correction of pulse distortion on aperture is suggested on the base of properties of operator of propagation in waveguide. The control of pulse form of field on aperture is demonstrated.
用解析法和直接数值法研究了圆波导开口端的瞬态辐射。利用模态基法计算了光场的特殊时间形式,考虑了短脉冲的辐射。该方法通过构造传播算子,利用拉普拉斯变换来解决脉冲正、负时间的演化问题。根据波导中传播算子的特性,提出了光阑上脉冲畸变的校正方法。论证了光场脉冲形式对孔径的控制。
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引用次数: 1
Dielectric function in semi-empirical tight-binding theory applied to crystalline diamond 半经验紧结合理论中的介电函数在晶体金刚石中的应用
Á. Miranda, V. Ponomaryov, L. N. de Rivera, R. Vazquez, M. Cruz‐Irisson
A semi-empirical tight-binding theory is employed to calculate the electronic band structure and the imaginary part of the dielectric function of crystalline diamond. Also, in order to validate the parameters used in this work, we have performed calculation by means of density functional theory with the local density approximation theory. We present the dependence of the dielectric function on the photon energy within two different approaches: interatomic and intra-atomic momentum matrix elements, which are applied and compared.
采用半经验紧密结合理论计算了晶体金刚石的电子能带结构和介电函数虚部。此外,为了验证本工作中使用的参数,我们利用密度泛函理论和局部密度近似理论进行了计算。我们提出了两种不同的方法:原子间和原子内动量矩阵元素中介电函数对光子能量的依赖,并对其进行了应用和比较。
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引用次数: 1
Estimation of thickness of subsurface air layer by neuron network technology application to reflected microwave signal 应用神经元网络技术估计反射微波信号的地下空气层厚度
O. Drobakhin, A. V. Doronin
Neuron network technology application to subsurface air layer thickness estimation is considered. The envelope of time-domain signal was used as input data. The three-layered neuron network with backpropagation and sigmoid (S-shaped) activation function of neurons was chosen. The comparison with results of correlation method is presented.
考虑了神经元网络技术在地下空气层厚度估计中的应用。采用时域信号包络作为输入数据。选择具有反向传播和s形神经元激活函数的三层神经元网络。并与相关法计算结果进行了比较。
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引用次数: 16
Fano resonance of waves in periodic slabs 周期板中波的法诺共振
N. Ptitsyna, S. Shipman, S. Venakides
We investigate Fano-type anomalous transmission of energy of plane waves across lossless slab scatterers with periodic structure in the presence of non-robust guided modes. Our approach is based on rigorous analytic perturbation of the scattering problem near a guided mode and applies to very general structures, continuous and discrete.
我们研究了在非鲁棒导模存在下平面波能量在具有周期性结构的无损平板散射体上的fano型异常传输。我们的方法是基于在导模附近的散射问题的严格解析摄动,并适用于非常一般的结构,连续和离散。
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引用次数: 8
Theoretical study of guided-mode resonances in planar doubly-periodic dielectric structures 平面双周期介质结构中导模共振的理论研究
N. Sydorchuk
In this paper the scattering characteristics are calculated with the technique based on the volume integral equations for polarization currents. Full-wave analysis is performed. A silicon-on-sapphire periodic structure is used to study the guided-mode resonances in plane-wave excitation conditions. Numerical computations for the reflection spectral resonances are presented for both weak and strong layer modulations. Spectral stability of resonances as a function of angle of incidence is investigated.
本文采用基于极化电流体积积分方程的方法计算了极化电流的散射特性。进行全波分析。利用蓝宝石上硅的周期结构研究了平面波激励条件下的导模共振。给出了弱层调制和强层调制下反射光谱共振的数值计算。研究了共振谱稳定性随入射角的变化规律。
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引用次数: 2
Improved method of remote sensing retrieval of sea water chlorophyll 一种改进的海水叶绿素遥感反演方法
E. Korchemkina, E. B. Shybanov, M.E. Lee
Method of satellite data correction, adjusting the standard atmospheric correction, is considered. Marine phytoplankton pigment concentrations were retrieved from SeaWiFS data using the correction proposed. Maps of chlorophyll distribution in region of Crimean South Coast were plotted, showing best correlation with biological data than when using standard methods.
考虑了利用大气标准改正卫星资料的方法。利用提出的校正方法从SeaWiFS数据中检索海洋浮游植物色素浓度。绘制了克里米亚南海岸地区叶绿素分布图,与标准方法相比,与生物数据的相关性最好。
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引用次数: 0
Using method of integral equation on the base of cross region to solving three-dimentional difraction problems 利用基于横截面的积分方程方法求解三维衍射问题
V. Morozov, V. Magro, V. Marmer
Using method of integral equations to solving three-dimensional diffraction problems are presented. The solution of three-dimensionally problem of radiation from longitudinal slot in wide wall of rectangular waveguide is considered.
介绍了用积分方程法求解三维衍射问题的方法。研究了矩形波导宽壁纵缝辐射的三维问题。
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引用次数: 1
Correlation properties of electromagnetic field generated by emitters with random orientation 随机方向发射体电磁场的相关特性
S. Lyagushyn, Yu.M. Salyuk, A. Sokolovsky, Dnipropetrovs’k National University
The necessity of more thorough description of electromagnetic field is substantiated for the problems of quantum optics. An attempt to construct the correlation functions of emission generated by a superfluorescent system of Dicke type is done. Operator evolution equations for a system of two-level emitters interacting with electromagnetic field lead to quantum analogues of Maxwell equations. Reduced description method applied to the superfluorescent process allows to find parameters characterizing the field fluctuations and some generalizations of matter equations.
对于量子光学问题,证明了对电磁场进行更彻底描述的必要性。本文尝试构造了Dicke型超荧光系统的发射相关函数。两能级发射体与电磁场相互作用系统的算子演化方程导致麦克斯韦方程组的量子类比。将简化描述方法应用于超荧光过程,可以找到表征场波动的参数和物质方程的一些推广。
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引用次数: 5
期刊
2008 12th International Conference on Mathematical Methods in Electromagnetic Theory
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