查询词典 conical helix

For the demand of low orbit satellite communication system requiring, designs the quadrifilar helix antenna was designed.

根据低轨道小卫星通信系统对天线的要求，文章对四臂螺旋天线进行研究。

The theory of the quadrifilar helix antenna is analyzed in the aspect of application, thus the design work is done under the theoretical guidance.

2从工程应用出发对四臂螺旋天线进行详细的理论分析，为设计工作提供理论指导。

The quadrifilar helix antenna is widely used in the space communication, as it has globe symmetry band and good circular polarization.

四臂螺旋天线由于其优良的圆对称半球波束特性，良好的广角极化特性，在空间通信中得到广泛的应用。

A new quadrifilar helix antenna is given. The antenna has four feed ports and the phase difference between two border upon ports is 90 degree. The simulation results indicate that this antenna has a good performance of axial ratio and gain pattern.

为了改善天线的轴比性能，文章提出了一种4臂等幅馈电、相位依次相差90度的天线方案，仿真结果表明，这种天线的增益特性和轴比特性都得到了较大的改善。

Considering the actual condition on the satellite, the forms of the antennas are defined as quadrifilar helix antenna and microstrip antenna, and their pros and cons are discussed.

其主要内容如下： 1 概述了该小卫星上对各种天线的使用需求，并针对该卫星实际情况，选定天线的形式，即四臂螺旋天线和微带天线，同时论述了它们的优缺点。

The paper studies a quadrifilar helix antenna with good radiation property and proposes a new one.It has four feed ports and the phase difference between two borders upon ports is 90 degree.

K ilgus在1968年提出的谐振式四臂螺旋天线[1]具有一些引人注目的特点，该天线通过选择适当的物理尺寸以及馈电方式可以形成不同的辐射方向图；此外它还具有重量轻、尺寸小、不需要参考地的优点。

A Quadrifilar Helix Antenna is adopted for the platform positioning and a horizontal monopole using the cylindrical wall of the cavity as its ground is adopted for communication.

定位天线采用四绕螺旋天线；通信天线采用以腔壁为地的水平单极振子。

quadrifilar helix antenna ; circular-polarization ; axial ratio

它有四根旋臂和顶部的两根直臂，每根旋臂的旋转角

When human DNA begins to rebundle as a twelve-stranded helix system and this information is acted upon, there will be incredible power.

当人类的 12 条 DNA 螺旋系统开始重新连接一起—而信息就开始起作用，那将有着不可思议的力量。

But 5-helix was apt to form inclusion body when expressed directly in prokaryotic cell and was difficult to renature, which causes inconvenience to future study.

但5-helix基因在原核细胞中直接表达时易形成包涵体，复性困难，给研究带来不便。

He paid $5,000 for this cupcake.

他我这个纸杯蛋糕花了5000美元。

I mean, if you want to, that is

我的意思是，如果你们想吃的话。