查询词典 antennas

There are all kinds of antennas used in EMC test such as biconical antennas, log periodic antenna, helical antenna, ridged horn antenna and etc.

用于电磁兼容试验的宽频带天线有很多类型，如双锥天线、对数周期天线、螺旋天线、喇叭天线等等。

Paper introduces the sorts and request for design of optical antennas, choosing the cassegrain antennas based on the characteristic of space optical communication. The structure and work principle of cassegrain antennas are discussed, as well as the relation of parameters each other.

论文介绍了光学天线的分类和设计要求，根据空间光通信的特点选择卡塞格伦反射式天线，讨论了卡塞格伦天线的组成及工作原理，以及卡塞格伦天线参数之间的相互关系。

I used circular polarization helix antenna and linear polarization horn antenna do a lot of experiments for many situation, for example, different polarization mode、different distance between antennas and metallic body among antennas, and I acquire some valuable data.

使用圆极化方式的螺旋天线和线极化方式的喇叭天线分别对不同极化方式、不同天线间距和天线之间存在金属障碍物等各种情况进行了大量的实验，并获得了有价值的数据。

A fast generalized complex sphere decoder is proposed for under-determined MIMO systems with fewer receive antennas than transmit antennas in this paper.

它能处理多输入多输出系统中发送天线多于接收天线的情形，并能同时检测具有格型结构和不具有格型结构的二维空间星座信号。

Deficiently, only ordinary antennas are studied here, circular array and cylindrical array, for example. Farther study about complex and anomalous conformal antennas is expected.

不过，本文中只对简单形式的共形阵天线，如圆形阵、圆柱面阵天线进行了分析，复杂的不规则的共形阵天线的情况还有待于进行进一步的研究。

A series of theoretical and experimental studies on the microstrip patch antennas with dielectric superstrates is carried out systematically. Firstly, a comprehensive survey of the microstrip antenna technology and its theories are presented. Then, two analysis techniques, named as the spectral domain Green's function method and the spectral domain integral equation method are developed. The SDGF method is a simplified analysis technique, which takes advantage of the spectral domain immittance approach to find the dyadic Green's function for the stratified media, and obtains the complete closed-form formulas for radiation patterns, directivity, efficiency, gain etc. Some interesting calculated results are presented. The SDIE method is capable of determining resonant frequency, radiation characteristics, input impedance etc, for the covered microstrip patch antennas. Comparing with other full-wave analyses it reduced computation and mathematical labour remarkably. The singularities near the pole location of the surface-wave modes and the difficulty of the integral computation over infinite range of oscillating integrands are dealt with actively and documented well. Results predicted by the SDIE method agree extremely well with our experimental results for resonant frequencies of various superstrates. The superstrate effects on impedance and radiation characteristics also have been investigated experimentally so that the gap due to lack of measured data and computed results for multi-layered superstrate has been filled to some degrees and two useful observations have been achieved for weakening the resonant frequency shift and optimizing the microstrip antenna gain. As a meaningful application, the design and analysis of a 4×4 patch array are introduced.

实用微带天线普遍加介质覆盖层来防护热，物理损伤和环境影响，也可能在飞行或严酷气候条件下自然形成覆盖层本论文对带介质覆盖层的微带贴片天线系统地作了一系列理论和实验研究首先，对微带天线技术和理论作了全面的综述然后，发展了两种分析方法，称为谱域格林函数法和谱域积分方程法SDGF法是一种简化的分析技术，它利用谱域导抗法来求得分层媒质的并矢格林函数，并得出方向图、方向性系数、增益等参数的完整的闭式公式，给出了一些令人感兴趣的计算结果SDIE法能确定介质覆盖微带天线的谐振频率、辐射特性和输入阻抗等与其它全波分析方法相比，它明显减小了计算量和数学工作量已有效地处理了表面波模极点附近的奇异性和对振荡的被积函数的无限区间积分计算的困难对于不同覆盖层情况下的谐振频率，由SDIE法所预示的结果与我们的实验结果吻合得很好对于覆盖层对阻抗和辐射特性的影响也已作了实验研究这在某种程度上填补了缺少实验数据和计算结果之间的间隙，并得出了缓解谐振频率偏移和优化天线增益的两点有用的结论作为有意义的应用，介绍了一个4×4元矩形贴片天线阵的设计和分析。

In Chapter 3, some monopole antennas are studied, which is focused on the realization of light weighted and miniaturization of the antennas.

通过比较分析，获得了天线性能随不同几何参数的频率变化规律，特别是宽频带特性的频变规律。

A system for transmitting a signal via diversity antennas (60, 70; 150, 160, 170, 180; 190, 200) includes: at least one delay element (100) for generating at least one delayed replica of the signal subject to a given delay; the signal and the at least one delayed replica being adapted to be transmitted via the diversity antennas (60, 70; 150, 160, 170, 180; 190, 200), and a control unit (110) for the at least one delay element (100) for varying (110) the given delay (100), whereby the signal and the at least one delayed replica, transmitted via the diversity antennas (60, 70; 150, 160, 170, 180; 190, 200), give rise to alternate constructive and destructive combinations therebetween.

一种用于经由分集天线(60、70；150、160、170、180；190、200)传送信号的系统包括：用于生成受到给定延迟的信号的至少一个延迟复件的至少一个延迟部件(100)；该信号和该至少一个延迟复件适合于经由该分集天线(60、70；150、160、170、180；190、200)传送，以及用于至少一个延迟部件(100)改变(110)该给定延迟(100)的控制单元，由此该信号和该至少一个延迟复件经由分集天线(60、70；150、160、170、180；190、200)传送，导致在其间交替的建设性和破坏性组合。

Being associated with three research projects, this dissertation makes deeply insight into the fast and accurate analysis, optimal design and manufacture of HF and VHF/UHF broadband omnidirectional miniature loaded wire antennas, loaded helical antennas and multiple-tuned VLF inverted L valley span antennas.

本文密切结合&十五&国防预研项目&软件无线电天线&和&宽带小型化天线&以及国防重点项目&某长波台发信天线电气参数分析与设计&等项目，研究了短波和超短波频段上的宽频带加载线天线、加载螺旋天线和超长波倒L形多路调谐山谷天线的快速精确分析、优化设计以及样机制作。

And the Finance Chair of PIERS 1997, Hong Kong. His research interests include RFID tag antennas, dielectric resonator antennas, microstrip antennas, wire antennas, guided wave theory, computational electromagnetics, and mobile communications.

他的研究领域包括无线射频设别天线、介质谐振器天线、微带天线、线天线、导波理论、计算电磁学以及移动通信等。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。