一种计算微机械小孔耦合微带天线阻抗的新方法

利用传输线模型结合微带线和波导缝隙间的耦合机制 ,结合对有效介电常数的计算 ,提出了一种适用于小孔耦合微带天线以及微机械微带天线工程设计使用的计算方法 ,并利用该方法计算了小孔耦合微带天线的输入阻抗以及微机械结构微带天线的输入阻抗 ,并将其反射损失和其它方法所得结果进行了比较 ,比较结果证实了本文方法的有效性 .     

关于电偶极跃迁的普用选择定则的讨论

推导出电偶极跃迁的普用选择定则，以单电子（或单价）原子和多电子原子能级间跃迁为例，阐明了这些规律的实质。     

有限长截锥侧隙缝天线在E面上的辐射场

针对隙缝天线严格的解析辐射解复杂难求的问题，提出了采用几何绕射理论的计算方法，并将飞行器机身等效为有限长截雄，得到了计算结果．     

Analysis of wire antennas mounted on large perfectly conducting platforms using MLFMA

The electric field integral equation (EFIE) combined with the multilevel fast multipole algorithm (MLFMA) is applied to analyze the radiation and impedance properties of wire antennas mounted on complex conducting platforms to realize fast, accurate solutions. Wire, surface and junction basis functions are used to model the current distribution on the object. Application of MLFMA reduces memory requirement and computing time compared to conventional methods, such as method of moment (MOM), especially for the antenna on a large-sized platform. Generalized minimal residual (GMRES) solver with incomplete LU factorization preconditioner using a dual dropping strategy (ILUT) is applied to reduce the iterative number. Several typical numerical examples are presented to validate this algorithm and show the accuracy and computational efficiency.     

Low dipole moment large β electrooptic chromophores based on exocyclic double bond conjugated bridge

Novel low dipole moment (μ) and large first hyperpolarizability (β) electrooptic chromophores have been designed based on the special characteristic of reversed dipole moment in the excited state of exocyclic double bond (ECDB) conjugated bridge by the optimization of the substituted method, and their electronic and second-order nonlinear optical properties have been theoretically investigated by employing the AM1/FF and ZINDO/S-CI approaches. By extending the conjugation length and optimizing the donor/acceptor strength, the oscillator strength of the excited transition that contributes to the molecular nonlinearity can be further enhanced. The designed chromophores possess a larger figure of merit (FOM) than that of 4-N,N-dimethylamino-4′-nitrostilbene (DANS), and lower (<5 D) ground state dipole moment.     

极化矢量■与磁化矢量■的关系

本文讨论电磁场与介质的相互作用。认为在一般情况下,介质既产生极化,也产生磁化。因此,极化对介质的磁化有贡献。同样,磁化对介质的极化也有贡献。     

三维FDTD中完全匹配层的应用

介绍了完全匹配层推广到三维情况，并且在ＦＤＴＤ方法中应用于完全匹配层吸收边界计算了自由空间中电偶极子辐射问题，得到了非常精确的结果。     

球形地质体在阶跃磁偶极源激励下的瞬变电磁响应

解析地研究了瞬变电磁 深中的一个体物理模型，被探测的目标为一球形地质体，发射为一通有阶跃电流的磁偶极子。得出了解析解表示式，同时给出了几种特殊情形下的解式。     

具有中心对称介质的三阶非线性偶极辐射

在经典物理框架内，把中心对称介质的偶板子运动方程化为了具有立方项的二阶非线性微分方程，用Jaeobian椭圆函数和第一类全椭圆积分给出了方程的解和电子振荡周期，并对偶极辐射进行了经典描述，给出了电子的辐射能量、瞬时辐射强度和平均辐射强度．     

对数周期天线阵波束形成的最优激励研究

文章利用微波网络理论与矩量法相结合,系统地分析、计算了对数周期天线阵的输入阻抗、增益及方向特性,并在此基础上对任意波束指向和最大输出功率下,天线阵的最优激励进行了详细分析,所得结果对天线阵的合理布局及超视距通信系统的设计具有指导意义。