5G双极化室内全向吸顶天线设计及应用研究

通过设计实现方案和仿真分析,对比了5G圆锥型双极化室内全向吸顶天线和5G PIFA型双极化室内全向吸顶天线的性能指标和优缺点.在办公楼场景开展了单、双极化全向吸顶天线覆盖性能测试,并进行了造价对比分析.结果表明,5G双极化室内全向吸顶天线与5G单极化室内全向吸顶天线覆盖性能相当,但可节省投资及降低后期维护成本,能实现5...     

适用于LTE室内分布的三极化天线结构研究

对LTE系统及现有室内分布天线进行概述,提出一种新的适用于LTE室内分布的三极化天线结构,对这种三极化天线进行仿真分析,给出天线性能指标,说明该三极化天线具有良好的性能,并可针对室内分布环境的变化进行波束调整,该三极化天线在LTE系统中具有广泛的应用价值。     

双极化对数周期阵列天线

介绍了一种由双极化对数周期天线单元组成的1—6GHz宽带高效测向天线降，给出了双极化对数周期天线单元分析、设计方法及计算、测试结果。分析了拼阵方法，对于对数周期天线的一些概念作了计算和分析。该天线阵在一测向系统中得到了较好的应用。     

TD-LTE系统中的单双极化智能阵列天线性能分析

研究了TD-LTE系统中双极化技术对智能阵列天线性能的影响,理论分析了下行波束赋型算法中赋型增益与信道矩阵SVD分解后的奇异值的关系,并基于相关阵信道模型利用数值计算统计出单、双极化智能阵列天线的信道特征参数。然后,通过蒙特卡洛数值仿真方法对TD-LTE系统在单、双极化智能阵列天线配置下的误块率性能进行评估。理论分析和仿真结果都表明,双极化智能阵列天线在误块率性能损失较小情况下显著减小了阵列尺寸,具有实际应用价值。     

风廓线气象雷达双极化相控阵天线系统

文中介绍了一种运用于风廓线气象雷达的双极化相控阵天线系统,通过双极化天线单元的分离式设计以及馈电网络分层架构,使得天馈系统结构紧凑,连接形式简洁;然后对分离式双极化天线单元进行了仿真,分析其扫描驻波并最终确定了2种极化辐射单元的位置关系和具体尺寸。最后给出了天线阵列实测的典型技术参数和方向图。     

中国移动通信集团设计院喜获5项天线相关专利受理

近日,由中国移动通信集团设计院有限公司研究所提出的"一种双极化吸顶天线"、"一种宽频带双极化全向天线及馈电方法"、"一种移动通信基站天线隔板"、"一种共站址基站天线"、"一种室内多系统共用的上、下行信号处理方法及设备"5项专利申请已由国家知识产权局受理,喜获国家专利号。     

一种宽带宽角双极化相控阵天线单元研究

设计了一种宽带宽角双极化相控阵天线单元,该天线单元采用指数渐变开槽天线形式,并设计了金属匹配柱安装在双极化天线单元之间,保证了开槽天线的接地连续问题。依次给出了该双极化天线单元的仿真设计、阵列样机的性能测试,从仿真和测试结果中可以看出,该双极化天线在3倍频程带宽内具有良好的匹配和辐射特性,并且能实现大角度二维扫描。该双极化天线单元具有宽频带、体积小、结构简单等特点,适于用作宽带宽角扫描相控阵天线的阵列单元。     

双极化测向天线交叉极化机理分析及优化设计

双极化天线的极化隔离度是多极化测向系统的关键指标之一,是系统用以正确测向的基础.针对正交双极化天线的极化隔离问题,提出了一种单极子阵列等效模型对不同结构的交叉极化机理进行分析,利用对称平衡化设计思路,提出小口径条件下提升交叉极化性能和极化隔离性能的技术方案,并结合全波仿真方法进行了验证.     

超表面加载极化可重构双极化微带天线设计

基于超表面结构设计了一种2.555~2.655 GHz频段的极化可重构双极化微带天线。首先根据微带天线理论设计了缝隙耦合正交馈电的双极化微带贴片天线,然后提出并设计了一种方形切角的新型超表面结构,并将该超表面放置在双极化微带天线上,通过机械方式旋转超表面,实现了左、右旋圆极化和水平、垂直线极化之间的极化转换。利用HFSS仿真软件对该超表面加载微带双极化天线进行了仿真。结果表明,该双极化天线能够便捷地实现极化转换,且在两种极化状态下,天线在工作频带内的回波损耗小于–10 dB,隔离度大于20 dB,圆极化工作状态下的轴比小于3 dB,天线的整体性能良好。     

一种适用于LTE和Sub-6 GHz频段的宽带双极化基站天线

提出了一种适用于LTE和Sub-6 GHz频段的紧凑型双极化基站天线辐射单元,辐射振子臂采用1.2 mm板厚的FR4基板双层印制工艺。利用在双极化辐射单元上方加载寄生单元的方式来扩展天线工作频带。实物测试结果显示天线工作频段可连续覆盖LTE(1.8 GHz^2.7 GHz)和5G的Sub-6 GHz频段(3.3 GHz^3.7 GHz),带内电压驻波比小于1.8,隔离度大于20 dB。天线最高增益为9.42 dBi,半功率波束宽度为60°±9°。测试和仿真结果吻合较好。可应用于4G和5G移动通信基站。     

Dual‐polarized MIMO antenna system for WiFi and LTE wireless access point applications

In this paper, a dual‐polarized multiple‐input multiple‐output (MIMO) antenna system suitable for indoor wireless access point is proposed. The presented MIMO antenna system consists of two coplanar‐waveguide‐fed monopole antennas with orthogonally polarized modes. According to the closely spaced structure of the MIMO antenna system, the mutual coupling between the ports is a big challenge. Therefore, a new structure of parasitic element is introduced in order to improve the mutual coupling between the ports. For the purpose of validating the simulated results, the antenna prototype has been fabricated and measured; the comparison of the results shows that there is an acceptable agreement between the measurement and simulation results. The proposed design covers the frequency bands of WiFi (2.4 GHz), Worldwide Interoperability for Microwave Access (2.3 and 2.5 GHz), and Long‐Term Evolution (LTE; 1.5 and 2.6 GHz) applications with a reflection coefficient less than −10 dB and a mutual coupling coefficient better than −15 dB. The MIMO antenna system provides an envelope correlation coefficient less than 0.15, polarization diversity gain more than 9.985 dB, and quasi‐omnidirectional pattern within the expected frequency band. In addition, LTE downlink throughput measurements show that the proposed antenna system delivers data rates close to the theoretical maximum for quadrature phase shift keying, 16 quadrature amplitude modulation (QAM), and 64‐QAM modulations. Copyright © 2014 John Wiley & Sons, Ltd.     

LTE移频室内解决方案研究

提出了一种LTE移频室分解决方案,在室分系统中通过一条物理线路传输LTE的MIMO信号,并且可以达到MIMO双路的覆盖效果。通过测试验证了该方案的性能,可实现LTE网络在室内的快速部署。     

一种基于多天线簇的新型LTE室内定位系统

随着移动互联网业务的迅速发展,位置服务需求越来越多样化,定位技术也变得越来越重要.LTE(long term evolution)室内蜂窝网络可以解决GPS(global positioning system)信号无法进入室内的问题,从而提供高精度的位置服务.LTE室内定位需要不同基站之间进行精确同步,这给室内网络部署带来了新的挑战.针对上述问题,提出了一种基于多天线簇的LTE新型无线定位系统,通过上行探测参考信号(sounding referencesignal,SRS)获取信号到达时间差(time difference of arrival,TDOA).该方法不需要簇间同步,可有效降低网络部署难度.其次,针对此系统设计了一种新的TDOA定位算法,可支持灵活的天线簇配置.最后,通过仿真及实验验证了该定位系统及算法的有效性,实验结果表明可实现米级室内定位精度.     

四网协同中室内分布系统天线口功率的理论研究

如何在四网协同中改造现有或新建分布系统是重中之中的问题。主要介绍了四网协同中各系统天线口功率的基本计算方法,在已知各系统边缘场强的前提下,最终确定四网协同的天线口功率,为后续的分布系统设计方案提供了重要依据。     

传统室分错层单支路泄漏实现MIMO双流效果

随着移动网络的迅速发展,用户对下载速率的要求越来越高。但考虑建设成本,目前绝大多数楼宇的LTE室内分布系统方案为在原有的单通道分布系统基础上进行简单的合路,无法发挥LTE MIMO双流传输模式的技术优势,损失LTE室内分布系统约50%的容量。为低成本实现4G室内分布系统中的MIMO双流效果,提高4G用户感知,本文提出错层单支路泄漏实现MIMO双流效果的方法。     

A dual polarized antenna on a novel broadband multilayer Artificial Magnetic Conductor backed surface for LTE/CDMA/GSM base station applications

The paper presents a low profile dual polarized dipole antenna topology backed by a novel broadband multilayer Artificial Magnetic Conductor (AMC) based reflecting surface. The antenna consists of a pair of square loop shaped dipoles with T-shaped feed structures arranged orthogonally to provide dual slant polarizations at ±45°. The antenna structure is backed by a novel multilayered AMC structure consisting of stacked square patches with via connected at middle and an air filled ground plane at the bottom. Experimental results show that the proposed antenna operates from 700 to 1000 MHz with bandwidth of 35% and an average gain of 8.5 dBi over the bandwidth. The Simulated and measured results of the antenna structure indicate the antenna to be suitable for interoperable Long Term Evolution (LTE), Code Division Multiple Access (CDMA) and Global System for mobile communications (GSM) applications.     

Branch correlation measurements and analysis in an indoor Rayleigh fading channel for polarization diversity using a dual polarized patch antenna

Spatial diversity techniques are advantageous if the received signals of the diversity branches are sufficiently uncorrelated. Theoretical study using the power unbalance between the two branches employing Laplacian direction of arrival (DOA) distribution is carried out. It is shown that for low value of cross-polarization power ratio (XPR) the correlation has a negligible effect. In order to validate the theoretical results indoor NLOS measurements were carried out. The measurements were done to study the cross-correlation between two received signals of orthogonal polarization using a dual linear polarized patch antenna. The antenna has been designed, built and measured. The results of the channel measurements are given. It is concluded that received signals with orthogonal polarization in indoor Rayleigh fading channels have no significant envelope correlation.     

一种高隔离度的双极化微带天线阵的理论和实验

本文提出利用双端口的串行角馈方形帖片实现双极化,并设计了一种共面的双极化馈线网络,综合运用多端口网络模型、腔模理论和分片法,给出了单口双端口天线单元和双极化天线阵列的理论分析。本文法计算简单便,适合于工程应用,实际设计了一副６ＧＨｚ频段的背地里层天线阵,实验测量的双端口隔离度达－４１ｄＢ,其性能明显优于通常的单层双极化微带天线阵,该面阵结构简单、馈线网络较小,且易合并成更大规模的双极化瑚线阵。     

A C/ka dual frequency dual Layer circularly polarized reflectarray antenna with microstrip ring elements

This paper reports a dual frequency dual layer circularly polarized reflectarray operating in the C and Ka bands. A 0.5-m right-hand circularly polarized planar reflectarray antenna is designed using microstrip ring elements of variable rotations to achieve a cophasal beam at broadside. The microstrip ring elements are more compact than the traditional reflectarray elements and can minimize blockage for the multilayer multifrequency applications. The highest efficiencies measured are 46% at 7.3 GHz and 38% at 31.75 GHz. The tested cross-polarization levels are -21 dB at 7.3 GHz and -29.2 dB at 31.75 GHz at the broadside direction. The tested results show that the designed ring element is suitable for both the single and dual layer applications with good bandwidth and circularly polarized performance.     

5G与LTE无线网络设计差异性分析

5G无线网络系统相对LTE系统在技术架构、设计目标和面向业务上具有较大的区别,其无线网络设计无法简单采用现有LTE网络的设计方法。通过分析5G系统组网的技术方案,从网络规划覆盖、机房和天馈设备安装、有源数字室内覆盖系统等方面分析其与LTE系统的无线网络设计的差异性,帮忙设计从业人员建立对5G网络的整体认识,更好促进5G无线网络的设计,提升网络覆盖效能。