查询词典 dipole antenna

This thesis contributed to the comprehensive study of the Finite-Difference Time-Domain method and its application to the numerical computation of radiated electromagnetic fields in switched mode power supplies. The work includes mainly three parts: the study on the performance of PML absorbing boundary condition applied to pseudo low frequency electromagnetic problems; the validation of the FDTD method with PML absorbing boundary conditions and the corresponding computer software based on the numerical study of the electromagnetic field of an electric dipole antenna, and its application to the numerical computation of radiated electromagnetic fields in switched mode power supplies; the development of an improved alternating direction implicit finite-difference time-domain method.

在综合前人工作基础上，本文对时域有限差分法及其在开关电源辐射电磁场数值计算中的应用进行了系统的分析和研究，其核心内容包括：伪低频电磁场数值计算中PML吸收边界条件性能的研究；基于基准问题—电偶极子天线三维辐射电磁场，验证了本文构造的基于PML吸收边界条件的三维FDTD法及其计算软件，并应用于高频开关电源辐射电磁场的数值分析；提出了一种改进的交替方向隐格式时域有限差分法。

Furthermore, a size reduction rate of 50% compared with a general dipole antenna is realized.

此外，天线高度和常规偶极子天线相比减小了约50%。

A folded dipole antenna is in the shape of the letter T.

被折叠的偶极天线是在信件T 的形状。

Using the finitedifference timedomain electromagnetic method and c language program in the matlab software,the spatial electromagnetic field distribution radiation of photoconductive dipole antenna is calculated and displayed on the computer in a pseudocolor graph.

研究了光电导天线产生太赫兹波的辐射特性，利用麦克斯韦方程及其边界条件，计算了近远场的电场强度；采用电磁波时域有限差分方法，在Matlab系统软件中，用C语言编写程序计算光电导偶极天线的辐射太赫兹波的空间电磁场分布，并在计算机上以伪彩色图形显示，这种电磁场的可视化结果为天线的设计和改进提供了直观的物理依据。

The driven element of a Yagi is the equivalent of a center-fed, half-wave dipole antenna.

Yagi 的被驾驶的元素是中心被哺养的，半波偶极天线的等值。

In this thesis, FDTD method and the far field integration method are introduced and used in study of radiation characteristics of the dielectric parallelly loaded dipole antenna for pulse radiation.

本文用FDTD方法研究了脉冲天线在并联加载介质块后的辐射特性，并在共形网格算法的改进上做了一些探索。

The aspect of discuss in this paper such as anisotropic dipole antenna radication field numeral calculation and wave parameter calculation has little documentation systematic introduce at the present.

在研究过程中，涉及到复宗量贝塞尔函数的数值计算，由于它对本文的结果影响较大，且各种数学手册无虚宗量贝塞尔函数值可查，所以对其进行了较为详细的研究。

But we can believe that it will be a satisfactional method for its many merits. Keywords: ground penetrating radar, crosshole radar, electromagnetic fields, forward problem, dipole antenna. propagation constant.

这一现状当然要依靠理论的完善来加以解决，虽然这一过程是长期的，但可以相信，由于探地雷达的诸多优势，它必将获得极大发展而成为一种最理想的地下物探手段。

MF-PEDA exhibits excellent broadband behaviors covering the frequency range from 3.1 to 10.6GHz, good fidelities of signal waveforms in space, and radiation patterns similar to those of a conventional dipole antenna.

提出的宽带扇形-槽线耦合结构，可有效克服这类偶极天线在带宽和馈电方面的局限，从而让平面椭圆偶极天线能有效应用于工程实现。

This BALUN can effectively compensate the series reactances by introducing a shunt resonant circuit and thus achieve the maximum bandwidth of microstrip dipole antenna.

该BALUN引入一个并联谐振电路，可以有效补偿半波振子的串联电抗而实现微带半波振子带宽的最大化。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。