查询词典 block antenna

With the narrow bandwidth of microstrip antenna, a microstrip antenna with the substrates of double negative media is designed by the software HFSS which is based on finite element method.

针对微带天线带宽较窄的问题，采用基于有限元法的HFSS软件，设计1种以双负材料为衬底的微带天线。

Antenna mutual coupling is considered and the general coupling coefficients matrix from the equivalent network model of the multiple-antenna is obtained.

考虑多天线间互耦，建立了多天线系统等效网络模型，导出通用耦合系数矩阵。

In this paper the effects of scanning truncation error, scanning position error, random amplitude and phase error, and multiple-reflection error in near-field antenna measurement are analyzed; error equations and the uncertainty of measurement are obtained through computer simulation; compensated techniques for reducing the effects of measurement errors in near-field antenna measurement are presented and the formula and arithmetic of phaseless near-field techniques are derived.

本文从解析法和数值仿真两个角度深入分析口面天线近场测量中扫描面截断误差、扫描面位置误差、随机幅相误差、多次反射误差等误差源对天线远场特性测量精度的影响，一方面从理论上给出相应的误差方程，另一方面建立误差分析模型，通过计算机模拟，得到不同误差条件下测量结果的不确定度，并介绍了减小这些误差的修正方法，推导无相位近场测量的公式和算法。

On the basis of studying law of Farad Electromagnetic Induction and the antenna theories in electrodynamics,We can improve the device — semi-wavelength antenna —which is used for receiving electromagnetic waves and apply it to Farad Electromagnetic Induction Experiment.

在研究法拉第电磁感应定律和电动力学中有关天线理论的基础上，将电磁波的接收装置—半波天线加以改进，应用到法拉第电磁感应实验中去，即能方便直观地验证法拉第电磁感应定律，也能形象地诠释麦克斯韦方程的物理意义。

Based on the project of Cruise Antenna for Receiving DBS Video Signal, we analyze and design the foreside antenna and the circuit of comparing intensity of signal received f...

本文结合"DBS数字卫星广播移动接收天线"项目，对其前端天线进行了研究与实现，并对天线在载体移动过程中寻星和锁定卫星的关键电路—接收信号幅度比较器进行了研制。

Design the foreside antenna with ring-focus array antenna within no more than 7.8cm* VOcm* 88cm.

这种环焦阵列天线不仅可以克服初级馈源喇叭所引起的遮挡大于副镜所造成的次级遮挡的缺点。

Based on the project of Cruise Antenna for Receiving DBS Video Signal, we analyze and design the foreside antenna and the circuit of comparing intensity of signal received from DBS satellite in this paper.The project has the great achievements as below.?

本文结合"DBS数字卫星广播移动接收天线"项目，对其前端天线进行了研究与实现，并对天线在载体移动过程中寻星和锁定卫星的关键电路—接收信号幅度比较器进行了研制。

More specifically, the invention relates to an antenna (1) comprising: first (2) and second (3) linear sub-antennas which are equipped with sensors (21-2M, 31-3N) forming first and second line segments and generating a basic signal, the angle between the respective directional vectors of the first and second tangents to the midpoint respectively of the first and second line segments being between 30 DEG and 150 DEG ; an antenna processing device (4, 5) forming combined signals; a signal-processing device (6, 7) generating combined useful signals; a device (8) for calculating the correlation coefficients (Cij between the combined useful signals; and a device (8) for generating a detection signal (Rij when a correlation coefficient exceeds a threshold.

更具体地，本发明涉及一种天线(1)，包括：带有形成第一和第二线段并产生基本信号的传感器(21-2M，31-3N)的第一(2)和第二(3)线性子天线，第一和第二线段各自中点的第一和第二切线的对应方向矢量之间的夹角在30°和150°之间；形成组合信号的天线处理装置(4，5)；产生有用组合信号的信号处理装置(6，7)；计算有用组合信号之间的相关系数(Cij的装置(8)；以及当某相关系数超过阈值时产生检测信号(Rij的装置(8)。

The DC power supply wire and connector wire drawn from power supply box should wiring buried wire as possible, exposed wire must be fixed by holding latch; Notch on the ground between transmitting antenna support and receiving antenna support, so that bury power supply wire and connector wire, geosyncline's surface need be covered with stainless steel bead.

从电源盒引出的直流电源线及连机线，应尽可能布暗线，明线须用卡固定；发射天线架与接收天线架之间须在地面开槽，以便埋下电源线及连机线，地槽表面需用不锈钢压条封盖。

First, based on phased array antenna's mono-pulse goniometry and separate coordinate technology about phase control, the antenna beam pointing error formula, caused by phase quantization error, is derived from linear array and circular array to planar array and cylindrical array.

首先以单脉冲相控阵天线测角原理为基本理论出发点，利用相位控制的坐标分离技术，基于线阵、圆形阵等简单形式的相控阵天线，推导了平面阵、圆柱面阵等相控阵天线由相位量化误差引起的波束指向误差公式。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？