波导

In addition,the dispersion relation and delay characteristics of the coupled mode in two different YIG films are studied by numerical analogue in the range of inclination angle from 5° to 20°.

本文研究了在倾斜静磁场作用下，双层YIG薄膜波导结构中静磁体波的传播特性，得到了其色散的特征方程，计算了磁场倾角从5°到20°范围内双层波导结构中静磁体波传播的色散关系和延迟特性。

Based on the characteristic equation of THz electromagnetic wave in metallic hollow waveguide, the dependence of the transformation attenuation and phase constant on the frequency of THz wave, inner radius of the waveguide and conductance of the metal material using Newton-Raphson iterative method.

从其传输的特性方程出发，利用Newton-Raphson迭代方法数值模拟了传输损耗和相位常数随太赫兹波频率、波导内径以及波导中金属镀层的电导率变化关系。

A large uumber of numerical calculations using the analytic formula and the dispersion equation have been candied out on the relations of the attenuation and phase constant with wave frequency, thickness and conductivity of the lossy layer.

此式适用于截止频率附近，通过解析表达式和波导模式色散方程，对衰减常数和相位常数进行了大量数值计算，得到了它们随损耗层厚度、频率以及损耗层电导率的变化规律，两种方法所获得的结果有较好的一致性，研究表明，损耗强度和损耗层厚度的变化会改变波导中电磁模式的色散和简并特性，对于改善高功率回旋行波放大器中注波互作用带宽和模式竞争非常有益。

We use the waveguide simulation software BeamPROP? to analyze the effects of the Y-branch angle, the radius and central angle of arc waveguides, and the length of straight waveguide on insertion loss and nonuniformity.

采用光波导数值模拟软件BeamPROP~分析Y分叉角度、圆弧波导的半径与圆心角、直波导长度等结构参数对插入损耗与分光均匀度的影响。

Using finite difference time domain method, the electromagnetic field distribution of THz wave is simulated in a THz 2D PC splitter and by plane wave expansion method the dispersion relation and defect modes are achieved in a THz rotated PC waveguide.5. A woodpile three-dimensional (3D) PC with face-centered-tetragonal symmetry is one of the most popular 3D PCs because of its favorable band gap characteristics. Based on the woodpile fct lattice structure, we propose a novel woodpile THz lattice structure with comparatively decreased symmetry, better band gap properties and easy fabrication by varying some structure parameters.

计算结果为利用非线性光学差频方法产生THz辐射源的实验研究提供了深入和全面的理论基础；四、利用平面波展开法，通过改变二维THz光子晶体的结构参数，对二维THz光子晶体完全带隙进行了优化，分析出两种适合工作在THz波段的二维光子晶体结构；采用时域有限差分法和平面波展开法，计算出THz波在二维光子晶体"T"型分束波导，45度旋转波导中传输的电磁场分布以及缺陷模；五、Woodpile面心立方四角结构是三维光子晶体中被研究最广泛的结构之一。

In order to facilitate quantitative analysis, a rational model of physics for a rise inverse sine structure of 1×2 S-branch power splitter in glass is proposed. In thermal ion exchange, the distribution of normalized refractive index of two-step ion-exchanged optical power splitter and the distribution of splitter refractive index of different exchange time have been gotten.

为了便于定量分析，采用了一种上升反正弦S型分支光波导系统的物理模型，得到了在热扩散条件下两步离子交换光功分器波导区的归一化折射率分布和在不同交换时间所形成的玻璃波导折射率分布。

Consequently, there exists no difference between the propagation constants of these waves, the rotation of plane of polarization is absent when a linearly polarize...

我们得出结论：这种波导可用来制作极化不灵敏移相器；而文献〔3、7〕中的结果(在这种波导中，右旋和左旋圆极化波的传播常数不相等；当线极化波通过它时出现极化面的旋转)是有问题的。

It is found that the characteristic equations for right hand and left hand circularly polarized waves are identical.

在这种波导中，右旋和左旋圆极化波的特征方程是相同的，因此，它们的传播常数也是一样的；而当线极化波通过这种波导时，不出现极化面的旋转。

The characteristics of this copolyimide in chemistry and photics were determined.High quality copolyimide film could be obtained by casting the copolyimide solution on glass plate.Then the copolyimide was made into waveguide by using advanced processing techniques.Test results at optical co...

共聚物材料在溶液状态下用旋涂法获得了较高质量的共聚物薄膜，并在此基础上采用先进的光波导工艺技术将该材料制备成条波导，测试结果表明该波导在光通信波段1550nm处的平均传输损耗小于0.66dB/cm，局部损耗在0.2dB/cm，进一步改进后有望获得性能优异的光电子器件。

The Y branch of low-loss and wide branch angle can be used as power dividers/combines in modulators, switches, interferometric devices, semiconductor laser arrays, planar silica-based waveguide lasers.

本论文在最后还应用改进的广角光束传播法研究和设计了新型的低损耗Y分支波导结构，这种波导结构同时具有大分支角度的特点，在光波导开关、M—Z干涉仪等光器件中具有重要的应用。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。