抛物面

The addition of director element in 2 element bi-quad feeds gave high values of efficiency of illumination of offset parabolas.

叠加双菱馈源天线增加的引向器给了偏馈抛物面天线更高的照射效率。

With different dimensions of the director and distances between elements, somewhat higher gain can be achieved, but then the diagram is not optimal for the illumination of the offset parabolas.

用不同尺寸的引向器和不同的振子之间距离，可以实现更高的增益，但另一方面，方向图对偏馈抛物面天线不是最佳照射。

This fact at the start excludes some antennas as efficient feeds for SAT TV offset parabolas.

这实际就把一些做为卫星电视偏馈抛物面天线的高效馈源排除在外了。

I presented some diagrams of efficiency of a coffee can with different diameters as feeds for parabolas with different F/D and it is very clear how efficiently they work with offset dishes whose F/D is in the range 0.7-0.9.

我提供一些不同直径的咖啡罐做不同F/D的抛物面的馈源的效率图表，可以清楚的看出，当偏馈抛物面天线的F/D在0.7-0.9范围时，它们的工作效率如何。

That is, the vertical radiation angle is too narrow for the illumination of SAT TV offset parabolas, and horizontal is too wide, as shown in the figures.

原因是它的垂直方向角非常狭窄，换句话说，对于偏馈卫星电视抛物面天线来说，垂直方向角太狭窄了，而水平方向角又太宽了，如图所示。

A 3D corner reflector antenna, with dimensions of 1.7 wavelengths, still has too narrow a vertical diagram and is suitable only for very shallow offset parabolas, with F/D of about 1 and more.

一个尺寸为1.7波长的3D角反射器天线，垂直方向图非常狭窄，只适合很浅的偏馈抛物面天线，其F/D大约1或者更多。

It is obvious that 3D corner reflector antenna could be also adjusted for offset parabolas with a lower F/D if the diagram could be widen in vertical plane and narrowed in horizontal plane so that they are approximately equal to each other and at the same time retain all other good characteristics of this antenna.

显然，3D角反射器天线也必须调整才能用于低F/D的偏馈抛物面，如果它的垂直方向图必须宽，水平方向图必须窄，那么垂直和水平两者之间必须大体平衡，而同时要保持天线的其它所有良好特性。

Its span 12.8 meters, the telescope tube diameter 4.27 meters, the weight 11 tons, by three major part are composed, the first part is the opticator, the second part is the scientific instrument, the third part is the servosystem, including two lengths 11.8 meters, the width 2.3 meters, can provide 2.4 kilowatts powers the solar cell windsurfboards, two the parabolic antenna which use with the ground communication.

它全长12.8米，镜筒直径4.27米，重11吨，由三大部分组成，第一部分是光学部分，第二部分是科学仪器，第三部分是辅助系统，包括两个长11.8米，宽2.3米，能提供2.4千瓦功率的太阳电池帆板，两个与地面通讯用的抛物面天线。

The principles of applications of MLA, such as laser alignment, optical array generator, agile beam steering, and V-shaped light cone, et al., are expounded.

对微光学阵列在激光准直、阵列发生器、灵巧光束扫描器、抛物面反射型集能器阵列和V型光锥阵列等重要领域的应用原理和实现的技术途径进行了阐述，为微光学阵列器件的实用化奠定了基础。

Finally, a sixteen-meter - caliber-circinal-paraboloid structure under the action of self-weight is optimally designed.

对在自重载荷作用下的16m口径圆抛物面天线结构进行了优化设计，结果表明该优化程序收敛快、稳定性好。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。