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WLAN系统天线实用工程技术
分类:天线资料 下载:1 浏览:582 时间:2017-08-10本技术讲座主要根据宽带无线局域网系统组网实用工程中涉及天线的有关问题讲解相关的基础知识。 涉及的相关内容有: (1)天线的定义; ( 2)天线的基本类型; (3)天线的主要技术指标及其意义; (4)传输距离与发射/接收天线增益、发射功率和接收灵敏度的关系; (5)扩频系统中处理增益对系统传输性能改善的基本概念; (6)与宽带无线局域网相关天线的特点及适用范围; (7)根据实际地形、地貌和系统具体情况,选择合适天线、架设条件及射频系统的配置; (8)天线安装架设中注意事项及防雷安装要求。 -
分析宽频带、双极化、恒束宽、四脊喇叭的混合方法
分类:天线资料 下载:0 浏览:572 时间:2017-08-10何山红 傅永生 (南京电子技术研究所.江苏南京 东南大学移动通信国家重点实验室.江苏南京) 摘要:介绍了作为反射面天线馈源的宽频带+双极化+恒波束四脊喇叭.运用有限元和模式匹配相结合的混合法详细推导且计算了四脊喇叭的广义散射矩阵1然后运用口面积分计算了四脊喇叭的辐射远场.给出了四脊喇叭和用四脊喇叭做馈源的反射面天线的实测结果1 关键词:四脊喇叭.馈源.有限元法.模式匹配法.混合法.广义散射矩阵 -
A Novel Low-Profile Dual Band Dual Polarizaion broadband array antenna for 2 3G Base Station
分类:天线资料 下载:0 浏览:377 时间:2017-08-10Abstract In this paper, a novel dual-band broadband array antenna with low profile and dual polarization is proposed and developed. The array is formed by arc-probe-fed annular ring elements and pairs of cross microstrip dipoles nested together. The bandwidth of the annular ring antenna is improved through arc-probe-fed technique. The measured impedance bandwidths determined by VSWR<2 cover 806~960 MHz and 1710~2170MHz. The port isolation and the symmetry of the radiation for the lower band are improved by the “anti-phase and dual-feed” technique which also reduces the cross polarization level. The influences on the radiation patterns of upper band caused by the phase error are invested and the radiation patterns are improved through the phase compensation. In the end, the array is designed and the simulated and measured results are presented. The proposed array antenna is highly applicable to the base station of multi-band operations. Key words: Dual-band antenna, Dual-polarization, Broadband, Annular antenna, Printed microstrip dipole -
A Novel High Isolation Dual Polarization Broadband Array Antenna with Low Cross Polarization for 3G
分类:天线资料 下载:0 浏览:457 时间:2017-08-10Abstract In this paper, a novel linear array antenna is proposed and investigated experimentally and the measured results are plotted. The measured impedance bandwidth determined by VSWR<1.5 covers 1710~2170MHz and the port isolation is better than -30dB by additive isolated conducting frames which change the other array characters very little. The cutting slots in the side walls of the ground provide the given HPBW of 90±8°(Half-Power Beam Width) in azimuth plane and maintain a stable array characters. The antenna has a high front-to-back ratio of radiation pattern of 25dB and a low cross polarization level (-10dB in the forward region and -22dB on the axes of peak gain). The array formed by printed microstrip antennas mainly features in the slots and the isolated conducting frames which ensure the array characters satisfy the wireless communication criterions. The array antenna is highly suitable for the base station applications for 3G system. Key words: Base station antennas, Broadband, Dual-polarization, Port isolation, Cross polarization -
A Novel array formed by diamond antennas with high isolation for base station applications
分类:天线资料 下载:0 浏览:374 时间:2017-08-10ICWMMN(国际无线、移动和多媒体网络会议) 2006论文集 Abstract A novel linear array formed by diamond antennas with low profile and high isolation is developed and studied experimentally in this paper. The array can provide unidirectional patterns with a HPBW (Half-Power Beam Width) of 65±6° in azimuth plane and more than 15dBi peak gain in 1710-2170MHz with VSWR<1.5. The antenna consists of five dual-polarized array elements named “four-diamond” antenna. The isolation of two different polarized input ports of the array can be enhanced to -30dB by employing some isolation enhancement technologies. A dual-polarized broadband linear array is fabricated and the measured results are presented. The proposed array antenna is suitable for the GSM1800, CDMA1900 and ITU’s IMT-2000 base station applications. Key words: Base Station Antenna, Dual-polarization, Broadband, Isolation Enhancement, Four-diamond antenna -
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天线基本概念讲稿
分类:天线资料 下载:2 浏览:446 时间:2017-08-09目录 1无线电波的基本知识 2超短波的传播 3天线辐射电磁波的基本原理 4关于传输线的几个基本概念 5典型的移动基站天线技术指标综述 6通信距离方程 -
无线网络优化中的天线
分类:天线资料 下载:1 浏览:678 时间:2017-08-09目 录 一、天线的基本特性 1、 天线辐射的方向图 2、 天线的增益 3、 天线的驻波比 4、 天线的极化 5、 天线参数在无线组网中的作用 6、 通信方程式。 二、网络优化中的天线 1、 网络优化的概念 2、 网络优化的主要内容 3、 网络优化中天线的作用 三、海天公司为无线网络优化研制的天线介绍 1、 遥控电调电下倾天线 2、 公路双向天线 3、 高速公路覆盖用的高增益天线 4、 120o双极化天线 5、赋形天线 -
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