查询词典 antenna array

Planar Archimedean antenna has some advantages as wideband,small volume and good performance in circularly polarizing ,so it has broad appliance prosperity.

平面螺旋宽带天线具有频带较宽、体积较小、圆极化性能较好等特点，应用范围很广。

Circular twoarmed Archimedean spiral antenna s combination are designed and simulated with simulation software of high frequency electromagnetic Ansoft HFSS.

介绍微波被动比相测角的原理，利用ANSOFT高频电磁仿真软件HFSS设计圆形双臂阿基米德螺旋天线组合，天线组合的各项电性能指标均能满足微波宽带被动比相引信体制的要求，两天线进行中频比相的测试结果与理论计算结果吻合。

Since the transmitted data from each antenna is first pre-processed and then arithmetically added onto the training sequences, thus the influence of the unknown data to the channel estimation existed in normal implicit method can be cancelled.

由于每根天线的发射数据经过预处理后再算术叠加到训练序列上，从而消除了传统隐含估计方法中未知数据对信道估计性能的影响。

A novel arrow-shaped monopole antenna with a coplanar waveguide feed line is presented. The element and the feed line are etched on the same side of a substrate.

提出了一种新颖的共面波导馈电单极天线，"△"形辐射单元馈刻在介质板上，由同一面的共面波导传输线馈电。

A novel V-shaped slot antenna with a small right-angle triangle of supplementary slot is presented. The slot clement is fed by an arrow-shaped terminal of a microstrip line printed on the other side of substrate, and its good impedance matching is achieved by adjusting the area of this triangular supplementary slot.

提出了一种新颖的V形微带缝隙天线，地板上开一个直角V形缝隙，在V形缝隙的顶角处附加一个小直角三角形补偿隙，通过改变三角形补偿隙面积的大小可以对天线阻抗匹配进行优化，由基片另一侧的箭形微带线终端对缝隙单元馈电。

The main contributions in this area are summarized as follows,? The closed-form formula and its asymptotic form of system outageprobability are derived, through which it is shown that the outage probability decreased by a factor ofγ~(hereγdenotes the average SNR);? The closed-form formula of outage capacity is derived, through which weshow that 1 outage capacity increases with the increases of mean value of sytem SNR, and decreases with the increase of the variance of system average SNR; 2 in order to obtain higher outage capacity, the number of transmit antenna should be no more than that of receive antennas.?

特别的，针对多用户发送天线选择／最大比合并系统，主要贡献总结如下：·理论推导出中断概率的闭式解及其近似解，通过该近似解，可以得到中断概率以γ~的形式减少(这里γ是平均信噪比SNR)·推导出平均中断容量的闭式表达式，研究表明：1中断容量随着有效平均SNR的均值的增加而增加，随着有效平均SNR的方差的增大而减小；2为了获得更高的中断容量，发送天线的数目应当不大于接收天线的数目。

Chapter one and chapter two analyse the basis theory and give a whole design plan and expatiate the basic exoterica of system inculding primary technology for application. It involves the basic control theory of satellite antenna and analyse for the whole function. Chapter three gives the hardware design which includes hardware etlectrocircuit structure, principle chart, selecting all kinds of parts of the apparatus , the sensor elements and the design of serial communication electrocircuit etc. Chapter four and chapter five introduce software design for the SCM and the personal computer, giving mainly design theory and material program which includ the design of searching for the satellite and searching for the high-point and the program development by Delphi on PC, explaining the basic principium of asynchronous serial communication for epigyny computer and hypogyny computer.

第一、二两章阐述了系统的理论基础及应用的主要技术，包括卫星天线控制基础理论和整体功能分析等等；第三章是系统硬件设计，包括硬件电路组成及原理图、各类元器件的选取及传感器原理，串行通信电路设计等：第四、五两章是单片机、PC机软件设计，给出了主要部分的设计原理及具体程序，包括监控软件设计、寻优设计、寻星设计，PC端Delphi程序设计开发等，并阐述了PC机和单片机异步串行通信的基本原理，是本课题的重点所在。

Methods: A novel microwave antenna with water-cooled shaft was used in fresh liver of pig in vitro. Microwave energy was applied in one session at 60~90W for 5~25min, and the diameter and appearances of coagulation were observed.

采用一种新型的水冷式低杆温微波电极对离体新鲜猪肝行微波消融，单次能量输出60~90W，5~25min，观察不同消融条件造成的组织凝固范围和形态。

When using omnidirectional antenna, use all sorts of attemper advancedly algorithm cannot solve this bottleneck problem effectively.

当采用全向天线时，使用各种先进的调度算法都不能有效解决这个瓶颈新问题。

In this paper the influence of coma and spherical aberration on the far-field distribution and antenna receiving power is analyzed, in which aberration attenuation factor is introduced and the relation of it to root mean square of wavefront aberration is given.

分析了球差和彗差对信号光远场分布、天线接收光功率的影响，引入了畸变衰减因子，给出了畸变衰减因子与波前畸变均方根值的关系。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。