The Influence of the AEW Radar Antenna Sidelobe on the System Improvement Factor 机载预警雷达天线副瓣对系统改善因子的影响
Correction of Site Effects on Antenna Factor Measurement 场地因素对天线系数测量影响的修正研究
Triple sleeve antenna The drain voltage has been increased by a factor of four. 三层重叠高增益天线漏电压增高了三倍。
In this paper, the basic equations for antenna far field measurement theory are presented. From them, some important formulas for measuring radar cross section of target, gain of antenna, antenna factor and other parameters are deduced. 提出了天线远场测量理论中的基本方程组,并由此导出目标的雷达散射截面、天线增益以及天线系数等参数的重要计算公式。
The basic antenna parameters are given, for example power transmission coefficient, input voltage standing-wave ratio ( VSWR), quality factor, radiation field and directivity. The power transmission coefficient is calculated as a numerical example. 导出天线基本参数如功率传输系数,输入电压驻波比,品质因素,辐射场以及方向性系数的表达式,并以功率传输系数为例进行了数值计算。
Error Analysis of Antenna Factor in EMC Test EMC测试中天线系数的误差分析
In order to improve picture transmission quality, to reduce users'charge, and to popularize satellite education TV, the effective way is to improve satellite's transmitting power, to develop more efficient receiving antenna, and to reduce the noise factor of receiver system. 文中指出:增加卫星的发射功率,研究高效率的新型接收天线,降低接收系统的噪声系数,是提高图象传输质量,减少用户负担,普及卫星教育电视的有效途径。
Based on the energy dependence, we introduce the generalized Foster theorem for an arbitrary antenna system and the network quality factor Q to further describe the behaviors of the generalized resonance. 在此基础上,导出天线系统的广义Foster定理和表征广义谐振的网络Q值。
The antenna factor is a very important parameter. 天线系数是一项重要参数。
In order to assure the orbital antenna have the higher thermal stability, it's necessary to carry on the analysis of factor influence for temperature under space environment. 为了保证星载天线在轨运行时有较高的热稳定性,就必须对其进行空间环境下的热温度场影响因素分析。
Nevertheless, the antenna factor offered by the producer had been calibrated on certain precondition, If your antenna was used directly, measurement errors may occur at your test site. 然而,天线生产者提供的天线系数都是在一定前提下进行校准的,如果直接用于测量现场就会带来误差。
However, if you got the fact gain of the antenna first, you can calculate out the authenticity and accuracy antenna factor. 但若在测量现场先求得天线实际增益,便可计算出精度更高、实用而有效的天线系数。
An approach to determine the uplink capacity and load of code division multiple access(( CDMA)) systems employing the smart antenna technique was presented. The impacts of average antenna interference gain, inter-intra interference ratio, and multi-user detection factor were determined. 理论分析了影响基于自适应智能天线技术的码分多址(CDMA)移动通信系统上行链路容量的因素,研究了波束赋形平均干扰因子、小区外与小区内干扰比率因子以及多用户检测因子对系统容量的影响。
Built up thermal calculation model of Space-borne paraboloidal Antenna with the I-DEAS software, Analyze the influence factor of the thermal stability when it orbits the earth; 用I&DEAS软件建立了星载抛物面天线的热计算模型,分析了影响星载抛物面天线在轨的热稳定性的因素;
There are many factors that can influence the phased array antenna sidelobe level. In this paper the author select three kinds of factor of them to analyze. 影响低副瓣相控阵天线实现的因素很多,主要有三个因素:单元间互耦的影响、量化副瓣的存在和公差的影响,本文对这三种因素做了计算机模拟分析。
Model of phase relation between antenna array elements under Rice channel is researched, and the feasible methods of estimating the Rice K factor are summarized; 研究Rice信道下天线阵列的相位关系模型,总结Rice因子估计的可行方法;
Concrete attenuation factor is measured using antenna which is radiated concrete planar, and power value is measured both metal plate is placed behind concrete and metal plate is not placed. By calculating the margin and bring it into formula, attenuation factor is gained. 混凝土的衰减因子的测量采用天线照射混凝土平面,测量出混凝土后面放置金属板和不放置金属板功率值,通过计算它们的差值并代入衰减公式得到衰减因子的值。
Antenna is one of basic equipments in EMC test. Antenna factor is an important parameter of the antenna for electromagnetic compatibility. 天线是电磁兼容测试的基本设备,天线系数是电磁兼容天线的一个重要参数。
The contents of antenna array are discussed and the principle of pattern multiplication is elaborated, which focuses on the analysis of the changes of array factor with various factors by Matlab. 3. 讨论了天线阵的相关内容,阐述了方向图乘积原理,并借助Matlab重点分析了阵因子随各种因素的变化情况。
This system has many functions such as the transformation of test unit, the self-calibration of instrument, the correction of antenna factor, the conversion of test unit, the spectral scanning and the spatial scanning. 系统拥有测试单位的转化、仪器的自校准、天线系数的修正、测试单位的转化、频谱扫描和空间扫描等功能。
The accuracy of the antenna factor is related to the accuracy of the Electromagnetic Compatibility Measurement. 天线系数的准确性关系到电磁兼容测试的准确程度。
When we measure Antenna Factor in OATS or Semi-Anechoic Chamber, the result will include reflection interference signal because of site factors or surrounding obstacles factors. Thus, the result of measurement may be inaccurate. 在开阔实验场或半电波暗室中测量天线系数时会由于场地本身原因或周围障碍物原因将反射干扰信号带入测量结果,令天线系数测量值不准确。
The result shows that the reflection interference caused by site factors is effectively eliminated by measurement with time-domain gate. Time-domain gate can obviously correct the measurement result of antenna factor, especially in vertical polarization. 测量结论证明了加入时域门能有效去除由场地因素引起的反射干扰,对天线系数测量结果,特别是在垂直极化下的测量结果,有明显的修正作用。
On the view of antenna, the volume of antenna is always the dominant factor to determine antenna performance which brings up a question how to possibly improve the antenna performance in the finite and compact space. 从天线的角度来看,天线的积始终是天线性能的决定性的因素,这就提出了一个问题,如何在有限的空间,尽可能提高手机的天线性能。
As the air interface, the antenna play a very important role in the performance of the whole system and in most cases their dimensions are the decisive factor that determine the size of terminals. 天线作为无线通信进出口,在很大的程度影响着无线通信系统的性能。在大多数的情况下,天线的尺寸也是无线通信终端尺寸的主要决定因素。
In OATS and Semi-Anechoic Chamber, author carries out Antenna Factor comparison measurement with and without time-domain gate in different site setup. 在开阔实验场和半电波暗室两种情况下,对不加时域门和加入时域门进行了不同设置下的天线系数对比测量。
Antenna Factor of EMC antenna is a fundamental parameter in Electromagnetic Compatibility Measurement. 电磁兼容天线的天线系数是电磁兼容测试里最基本的测量参量之一。
Nevertheless, antenna, the essential part of wireless communication system, becomes an important factor that constrained its development. 然而无线通信中必不可少的天线,却制约其发展。
The attenuation factor and refractive index of concrete are measured using microstrip antenna array, the value of attenuation factor and the refractive index is gained, and complex permittivity of the concrete is figured out using these two terms. 利用微带阵列天线对混凝土的衰减因子和折射率进行了测量,得到了衰减因子和折射率的值,并利用这两个值计算出了混凝土的复介电常数。