查询词典 in-line antenna

It is concluded that when a small solid angles range adjacent to the main direction in the far field is considered, the parallel beams combining of compact antenna arrays has its priority if the phases can be controlled, and the parallel beams combining of sparse antenna arrays has its priority if the phases can not be controlled.

分析表明：当关注的是远区主方向邻近的小立体角区域时，若能做到控相激励，宜采用紧凑阵的平行波束合成；若不能控相，宜采用稀疏阵的平行波束合成。

In this paper, the effect of antenna boresight pointing instability on SAR image quality is studied. At the same time, the theoretical analysis and simulation results for the effect of antenna azimuth and elevation boresight pointing multi-frequency jittering on image quality in a squint mode are given respectively.

研究了天线波束指向抖动对图像质量的影响，分别给出了等效斜视情形下天线波束方位向多频抖动和距离向多频抖动对成像质量影响的理论分析和仿真结果。

In order to solve initial alignment of antenna for laser communication system between an aircraft and a ground station,the composition and algorithm theory of an antenna alignment system were demonstrated in detail,and the experimental data were analyzed.

提出了对飞机-地面间激光通信系统天线视轴进行初始对准的方法。论证了系统的硬件组成和算法原理，对实验数据进行了分析。

By embedding a C-shaped slot in the resistance-loaded annular-ring microstrip antenna,we design a compact dual-frequency microstrip antenna in this paper.

在对环形微带天线进行电阻加载实现天线小型化的基础上，通过对环形天线的C形开槽，实现了天线的双频带工作。

Control theory of antenna array uses the range-barycenter formular which US Boing put forward in 1970s in radio frequency simulation. This method neglects the change of polarization that the array surface curvature causes and the spacing between the antenna elements, so big errors are made.

射频仿真暗室天线阵列的精度控制通常采用20世纪70年代美国波音公司提出的幅度重心公式，该表达式忽略了天线阵面弧度对三元组喇叭极化方式的影响，以及三元组天线单元间距对控制精度的影响，因此存在控制误差。

A duplexer separates an RF signal received from the built-in dual band antenna from an RF signal to be transmitted to the built-in dual band antenna.

双工器分离从内置双频带天线接收的无线电频率信号和要发送到内置双频带天线的RF信号。

SCR-521. The most significant improvement in the ASE was the useof an antenna duplexer, which permitted the use of just one send-receive antenna, rather than two separate units.This yielded appreciable improvement in aircraft performance because of drastically reduced wind drag.

ASE上最重大的改进的使用了天线双工机，使得可以只使用一个收发天线而不是两个，这使飞行时的风阻明显减少，飞行性能得到显著的提高。

In view of the development about the certain airborne radar antenna array,considering the structural features of antenna array,analyse the cruces in manufacturing of feed cavity and radiant plate,and present the corresponding solution by mainly dealing with precise positioning style,delicate clamp design,error distribution and compensation method,high speed machining technology design,machining simulation and program optimizing.

某机载雷达平面裂缝阵列天线的单面阵如图1所示。该面阵布置多路裂缝线源，共分布384处长度各不相同的辐射裂缝，每一路线源均由脊型波导口单独馈电。面阵由辐射板和馈电腔两个零件组成，采用整体钎焊成形。线源结构为非对称单脊共线形式，即在普通单脊波导的两侧与辐射裂缝相对应的位置上布置不对称的凹台。

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。

The result indicates that radiation gain and power transmission coefficient from tag antenna to chip should be considered in the first place in order to ensure the basic reading and writing distance of the tag. The way to improve power transmission coefficient is to design the tag antenna and make sure its input impedance conjugate matching to the chip input impedance.

研究结果表明，为保证标签天线的基本读写距离，在设计标签天线时，需要首先考虑天线增益和标签天线到芯片的功率传输系数，提高功率传输系数的途径就是调整标签天线与芯片的输入阻抗并使它们尽可能实现共轭匹配。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。