Finally discussion is on how to optimize sidelobe level of the two sections of difference beam.
最后讨论了对于差波束两个切面旁瓣电平的优化的问题。
The finite difference beam propagation method(FD-BPM) can simulate the performance of the waveguide accurately.
有限差分束传播法则能够准确地模拟波导的性能。
The finite difference beam propagation method(FD-BPM)is used to design a device of 66% MMI-converter-Combiners.
采用有限差分波束传输法（FD-BPM）设计了一种66%模式转换、合并器。
Variational-Effective index method and Finite difference beam propagation method(FD-BPM) are both practicable waveguide simulation tools.
在众多的波导模拟工具中变分有效折射率法和有限差分束传播法都是实用性非常强的。
The three-dimensional finite-difference beam propagation method was used to compute the optical properties of fiber devices based on side-polished fiber.
本文还用三维有限差分光束传输法计算了侧边抛磨光纤波导的光学特性。
Calculating on practical problems shows that both the finite-difference beam propagation method and the gain character programs can give reasonable results.
实际计算表明，本文所编写的有限差分束传播法和掺铒波导增益特性计算程序，均能给出合理的计算结果。
The wave propagation characteristics of the splitter are numerically simulated by the finite difference beam propagation method and experimentally investigated.
首先用有限差分光束传播法模拟了器件的光波传播特性，然后进行了初步的实验验证。
This paper introduces the operation principle and engineering realization of a sort of high precise sum-difference beam single pulse direction finding receiver.
阐述了一种高精度和-差单脉冲测向接收机的工作原理及工程实现。
We analyze the pattern function of DBF in subarray under the ideal condition and with channel mismatch, and give the pattern functions of sum and difference beam.
本文分析了子阵dBF在理想通道条件及通道失配情况下的方向性函数，给出了其和差波束方向性函数特性。
The paper presents the principle of enhancing the resolution ability for the radar with sum-difference beam and the compression result by using the lobe compression technique.
介绍在具有和差波束的雷达中采用波瓣压缩技术提高雷达分辨能力的原理，以及采用该压缩技术后的压缩效果，最后给出该技术在幅度和差单脉冲雷达中的工程实现方。
The alternate-direction implicit finite difference beam propagation method (FD-BPM) is used to analyze the two-dimensional (2D) symmetrical multimode interference (MMI) couplers.
交替方向隐式有限差分波束传输法被用来分析二维限制对称多模波导干涉耦合器。
The one-dimensional phased array antenna discussed in this paper needs to radiate a narrow beamwidth and low sidelobe pattern on the horizontal, a sum and difference beam on the vertical.
所设计的一维扫描相控阵天线在方位面具有窄波束、低副瓣特性，在俯仰面实现和差波束。
So the main work in this dissertation is compiling and debugging the program for solving the field distribution in channel waveguides using three-dimensional finite-difference beam propagation method.
为此，本文重点完成了利用三维有限差分束传播法求解条形波导中场分布的计算程序的编写和调试。
The third difference is this: a beam of ordinary light diverges; a laser beam does not.
第三个不同点是：普通光束分离；而镭射光束却不然。
That's the first difference between a beam of ordinary light and a laser beam.
这是第一个不同点在普通光束和镭射光束之间。
So the research in this paper is about the internal force variation rule of the frame-supported beam of wall body, which based on some mature investigative experience at difference models.
因此本文的内容主要是在总结一些成熟的研究经验的基础上，对有开洞墙体的框支梁在不同的结构条件下其内力变化的规律进行研究。
Because the working media of laser is gas, and the pressure difference between the inner apparatus and environment of laser is large, so the window of output laser beam must be sealed.
由于其激光工作介质是气体，而且激光腔内的压力与外界环境压强相差很大，激光束的输出窗口必须密封。
Result shows that laser beam deflects to the direction which optical path length increase. The far-field intensity of laser beam is not the same for the difference of wavelength.
结果表明：强的激波结构使激光束远场强度分布发生了向光程增大方向的明显偏折，对于波长不同的激光束得到光束通过流场后的远场强度分布不同。
As the same time, the difference of force transferation between stiff beam under elasticity brace and stiff brace is compared.
计算的同时比较了弹性支撑上的刚性主梁和刚性支撑上的刚性主梁在活载传递上的差别。
With these difference equations and compensatory ones, the torsion problem of this kind of beam can be solved to get its torsional shear stress and co.
联立差分方程和补充方程即可求解此类复杂截面的扭转问题，得到扭转剪应力及截面扭转常数。
In the continuous composite beam bridge, the difference in type, arrangement area and arrangement space of shear connectors will cause variation in mechanical characteristics of the structure.
在连续组合梁桥中，剪力键的类型、布置范围和布置间距的差别将引起结构受力特性的差异。
Because of the difference of the beam wide, the two interaction mechanisms have intrinsic differences.
由于脉宽的差异，这两类激光脉冲与固体靶的相互作用机制会有本质不同。
It is shown that sum-difference amplitude-comparison monopulse is in fact an effective search method for a single target with azimuth in the vicinity of the peak the sum beam.
研究表明，传统单脉冲和差比幅法实际上是一种搜索方位在和波束最大点附近的单目标的有效方法。
In high seismic intensity zone, when the spans of adjacent frame beams have great difference, the short-span frame beam can be designed as coupling beam.
在高烈度地震区，相邻框架梁跨度相差过大时，可以将短跨框架梁按照连梁设计。
The phase difference between the signals from beam forming net can affect the modulation index of single channel signal and can lower the precision of tracking.
和差网络输出的和差信号相位差会影响单通道信号的调制度，进而降低跟踪精度。
Based on the classical theory of electromagnetism, the relation and the difference between OAM and the parameter of the beam in paraxial approximation are analyzed.
从经典电磁场理论出发，主要介绍了傍轴近似条件下，光束的轨道角动量和光束的参数之间的关系。
Transmission characteristics of light beam in different media are distinctive. Difference of refractive index of air and seawater is a determination factor that affects laser transmission.
光在不同介质中的传播特性不同，大气和海水折射率的差别是影响激光传输的决定性因素。
It can be approved by the theory and experiment that the extinction ratio of the parallel beam splitter is better than 10 ~ (-3), and the shear difference is improved too.
理论分析和实验测试表明，该棱镜消光比优于10 -3，且可以实现大的横向剪切。
It can be approved by the theory and experiment that the extinction ratio of the parallel beam splitter is better than 10 ~ (-3), and the shear difference is improved too.
理论分析和实验测试表明，该棱镜消光比优于10 -3，且可以实现大的横向剪切。
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