查询词典 antenna lead in

According to the theory of electromagnetic field and the theory of error a nalysis,the far field condition for antenna test is discussed,the influence of limited test distance on antenna far field measurement in a microwave anechoic chamber is analysed, and the error model is established.

利用电磁场和误差分析理论，在阐述天线远场测量条件的基础上，分析了微波暗室有限测试距离对天线远场测量的影响，建立了误差模型，并结合实例说明了微波暗室有限测试距离对天线场强测量、增益测量的影响。

First, the basic tracking laws of the user satellite s satellite-satellite antenna are deduced and according to several different conditions, the expressions for the azimuth angle and elevation angle of the satellite-satellite antenna are revised.

针对几种情况，并考虑地球的隔断影响和天线的自身限制，对星-星天线的方位角和俯仰角表达式进行了修正和补充。

Then based of it, we combine the log periodic antenna with the biconical as a broadband assembled antenna.

然后在此研究基础上对三角天线进行研究分析，并将对数周期天线与之组合设计制造出一副组合式宽带天线，用于展宽对数周期天线的频带宽度。

In this paper the dimension parameters which influence the electrical properties of the biconical antenna is discussed by means of simulation and experimental test. And a biconical omni-directional antenna array operating within 0.8~3GHz is designed. Its design parameters and the results of the simulation including curves of the VSWR, radiation pattern and the gain within the band are also given.

本文通过仿真与实验测试对影响双锥天线电性能的各种尺寸参数的作以探讨，并且设计了一种可工作于0.8～3GHz的宽带双圆锥全向天线阵，给出了该天线的具体结构尺寸以及仿真后的VSWR数据曲线，E面，H面辐射方向图和频段内各频点的增益值，以及此天线在0.8～3GHz范围内的VSWR测试数据曲线，并进一步提出了一些设计此类天线的关键点。

with the development of satellite navigation communication,antenna is a very important unit,performance of the satellite navigation communication system is affected by it partly.a new type of bifilar helix for satellite navigation communication system is introduced,and the traving-wave bifilar helix is analyzed briefly.meanwhile,the design and the test results are given.the results show that the antenna possesses excellent circular hemispherical beam with wide angle circular polarization and better impedance match,and has a compact structure and high integration.it can be applied in caps systems successful.

小 摘要：随着卫星导航通信技术的迅速发展，天线作为卫星导航通信系统中的重要部分，在一定程度上决定着卫星导航通信系统的性能。介绍一种用于卫星导航通信系统的双臂螺旋天线，讲述爬行波式螺旋天线的设计过程，并给出最终测试结果。结果表明，该天线具有优良的圆对称半球波束，良好的广角圆极化特性和优良的阻抗匹配特性，其结构简单、紧凑，为通信入站回传提供了一种优良的选择。

Company's main products are indoor coverage systems used in aluminum chamber, the board antenna, rubber antenna, eight antennas, and other wood used in plastic housings.

公司主要产品有室内覆盖系统使用的铝腔体，板型天线、橡皮天线、八木天线等所使用的塑料外罩。

Whether antenna deployable truss can unfurl to the appointed place in time and by rule and line affect the success of the whole antenna launching task directly.

天线伸展臂能否及时、准确的展开到位直接影响到整个卫星发射任务的成功与否。

Product type:This product carries to stick for the cartful glass contain source television antenna receive the system, it belong to the whip form antenna type.

产品类型：这一种产品进位对给一车玻璃的根包含来源电视天线受到系统，它属于鞭形式天线类型。

Thus it provides a theoretical basis for design and adjustment of refector antenna, particularly the modified Cassegrain antenna.

一、引言在反射面天线系统的设计中，相位中心的位置是一很重要的参数，因为它决定了馈源在反射面夭线系统中的相对位置，优选馈源的相位中心是提高夭线增益，控制旁瓣和交叉极化电平的有效手段。

I used circular polarization helix antenna and linear polarization horn antenna do a lot of experiments for many situation, for example, different polarization mode、different distance between antennas and metallic body among antennas, and I acquire some valuable data.

使用圆极化方式的螺旋天线和线极化方式的喇叭天线分别对不同极化方式、不同天线间距和天线之间存在金属障碍物等各种情况进行了大量的实验，并获得了有价值的数据。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48