查询词典 antennas

In order to overcome the shortcomings of the monopole antennas, a methods of quasi-fractal is used, which decrease the resonant frequency.

为此，对HF频段的单极子天线进行准分形，有效地降低了天线的谐振频率。

At last, two circular monopole ultra-wideband antennas with different radius are made.

并给出了仿真结果。

The second design are two short and thick sleeve monopole antennas, including a conic and a cylindrical conductor.

第二种设计是两种短粗套筒天线，包括一个锥形套筒和一个柱形套筒。

Secondly two different clutter suppression methods are proposed according to the clutter characteristic of airborne radar with cylindrical array antennas, which can resolve the problem of clutter spectrum's nonhomogeneity at range.

然后根据圆柱型阵机载雷达杂波分布特点提出了两种不同的杂波抑制方法，它们能够很好地解决圆柱型阵机载雷达杂波距离向分布非均匀的问题。

In this paper, firstly the differences between cylindrical array and uniform planar array are discussed in terms of eigenvalue distribution of the clutter covariance matrix and clutter distribution at range, and the conclusion of space-time clutter spectrum's nonhomogeneity at range for airborne radar with cylindrical array antennas is gained.

该文首先从圆柱型阵机载雷达杂波协方差矩阵特征值分布和杂波功率谱距离向分布两个方面分析了圆柱型阵列与均匀平面阵列之间的区别，得到杂波功率谱随距离变化的结论。

The NON-AS algorithm can be applied to receiver of multiple input and multiple output systems,and selection of receive antennas is based on the Frobenius-2 norm of instantaneous received signal vector.

NON-AS算法适用于多输入多输出系统的接收端，接收天线选择是基于每个天线瞬时接收到信号矢量的F-2范数。

A network coding based transmission scheme is proposed for multi-antennas based uplink wireless relay networks. Performance is evaluated from the perspective of ergodic capacity and outage probability, and is compared with ordinary receive diversity scheme and orthogonal space time coding scheme.

针对配置多天线的上行无线中继网络，提出了一种基于网络编码的传输方案，从遍历容量和中断概率的角度对其进行了分析，并与基于同样拓扑的普通接收分集方案和正交空时编码方案进行了性能比较。

In the beginning, some people secretly tuned into broadcasts from North Point on their parabolic antennas. But as time passed, the broadcasts no longer came in; maybe the satellites were destroyed.

人们开始接收北方传来的电视信号，但是没过多久信号就消失了，也许卫星已经被摧毁了，除了军用网络，一切计算机网络也被切断了。

There are also parabolic antennas modified to transmitters.

这也有对传输器的抛物面天线改造。

In the paper, we will make use of the improved alternating projections to carry out two examples on pattern synthesis of the conformal phased antennas on the general paraboloid of revolution and analysis them.

文中给出了改进的交替投影法的计算步骤，并将该方法成功地应用于旋转抛物面上的2个共形相控阵天线的方向图综合。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。