SMART ANTENNA FOR WIMAX BASE STATIONS

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Smart_antenna

PLL frequency synthesizers are used as the first local oscillator and the second local oscillator for up convention, in order to achieve enough short term and long-term frequency stability. The phase noise of the two synthesizers is derived from the performance of selected reference frequency and VCO. Both of the two local sources use oscillator with phase noise in frequency domain source library to simulate. The phase noise parameter of the two models depends on the derived result.
The following is the system schematic in ADS.
BPF_Butterworth FBS-200-2 Fcenter=IFf req1 BWpass=20 MHz Apass=1.2 dB BWstop=60 MHz Astop=20 dB
Amplif ier RF2671 S21=dbpolar(IFAGC,0) S11=dbpolar(-12,0) S22=dbpolar(-15,180) S12=0
ADS Application Notes
Microwave Laboratory, Department of Electronic Engineering The Chinese University of Hong Kong

WiMAX 简介讲解

WirelessMAN-OFDMA
• 本規範主要訴求在提供移動式應用。調變方式與WirelessMAN-OFDM相同，但多重接取採用的是分頻的FDMA，並支援可變 (scalable)頻寬的機制，其功能為根據通道狀況改變系統頻寬與次載波數
WirelessMAN-OFDMA (cont.)
• OFDMA的運作原則是將所有次載波分割成若干群組，稱為次通道(subchannel)，分配給不同用戶使用，並根據傳輸環境狀況決定各個次通道的次載波數。
LOS模式與NLOS模式
• NLOS(Non Line of Sight)模式 – 速度較慢，穿透力較高，適用於都會環境 – 使用2-11GHz頻段，最大傳輸距離為10公里 – 當通道頻寬為20MHz時，最高速度約75Mbps • LOS(Line of Sight)模式 – 速度較高，穿透力差，適用於空曠的環境 – 使用10-66GHz頻段，最大傳輸距離為5公里 – 當頻寬為28MHz時，速度最高為134Mbps
名詞解釋
• BS（Base Station，基地臺），指訊號發射端。 • SS（Subscriber Station，接收端），有室內、戶外型，必須轉接才能連到一般設備。 • CPE（Customer Premise Equipment，客戶端接收器），內建在設備上，不用像SS還要轉接裝置。 • RS（Rely Station，中繼器），在802.16j（Mobile Multi-hop Relay）制定，能延伸BS訊號，能智慧型轉發訊號。 • PTP（Point to Point，點對點模式），1臺BS對應1臺SS。 • PMP（Point to Multiple，點對多點模式），1臺BS可對應多臺 SS。 • License Band及Un-License Band（License-Exempt），前者為特許營運頻帶，必須有營運執照才能使用，例如2.5GHz及 3.5GHz，後者為非特許營運頻帶，不需執照，一般皆可使用，例如5.8GHz。 • LOS（Line-of-sight）及NLOS（Non-Line-of-sight），前者是指設備間沒有任何障礙物，視為直視距離，後者則是兩端間有障礙物，視為非直視距離。

摩托罗拉 RFS 4000系列80211n集成业务控制器说明书

规格表使分支机构真正实现有线无线网络融合设计紧凑和易于使用的摩托罗拉RFS 4000 802.11n 无线业务控制器，集成了固网、无线和安全联网特性等，使企业能够利用单一平台搭建强健可靠的分支网络。

此外，RFS 4000还提供集成的双模双频802.11n接入点，可实现广泛覆盖和卓越性能——满足中小企业（SME/SMB ）的所有需求。

此外，RFS 4000系列提供内置应用，比如Wi-Fi 和RFID 定位以及热点VoWLAN/视频服务等。

始终保持可靠联网RFS 4000具备多种特性，可在几乎任何环境中确保分支网络的可靠性和抗毁性。

RFS 4000可借助智能RF 防止接入点和自组网节点发生故障，因而，通过这个功能，联网用户可以实现自动优化和自愈。

摩托罗拉正在申请专利的群集机制，能够防止无线交换机发生故障对业务带来的影响，并提供主用/主用或主用/备用控制器冗余选项。

如果广域网发生中断，冗余的3G/ExpressCard 可通过提供广域网回程选项确保互联网服务。

RFS 4000为集成的双模双频机型，是业界唯一同时支持用户使用2.4和5GHz 两个工作频段的业务控制器，此外，它还具备在多小区环境中实现自组网的功能。

此外，作为摩托罗特性具备多种特性和功能的融合平台RFS 4000是一款全面集成的802.11n 无线业务控制器，将802.11n 接入点与带5个POE 端口的有线网络交换机整合在一起，具备IPSECVPN/防火墙/WIPS 安全、RADIUS 和DHCP 服务器、定位和RFID 引擎、3G 故障恢复等特性WiNG 架构借助将无线语音、视频、数据和多RF 技术（譬如RFID 、Wi-Fi （包括802.11n ），以及Wi-MAX 等未来技术）融为一体的单一平台，有效提高业务流程效率；丰富的企业级功能包括：在L 2/L 3部署的无缝漫游、灵活的故障恢复功能、全面的安全功能、长话级语音及其他增值服务，比如，多RF 定位。

室外光纤防水连接器产品手册说明书

CONTENTSPLASTIC MATERIALMETAL MATERIALACCESSORIES1 — ODVA系列防水连接器 / ODVA Series Waterproof Connectors2 — Fullaxs系列防水连接器 / Fullaxs Series Waterproof Connectors3 — Mini-SC系列防水连接器 / Mini-SC Series Waterproof Connectors4 — ODC系列防水连接器 / ODC Series Waterproof Connectors5 — 野战壁车式防水连接器 / Field Tactical Waterproof Connectors6 — J599系列航空光纤插头 / J599 Series Aviation Connectors 8 — 移动野战光缆绕线盘 / Portable Field Tactical Cable Reels7 — 其它品牌防水接头 / Other Brands Waterproof Connectors9 — 防水连接器配缆说明 / Fiber Optic Cables For Each Waterproof Connectors03 05 070911 1317 1523该款适配器使用在两个ODVA连接头相互对接的情况下。

适配器的两端均为螺旋卡口式的导向槽，以适配ODVA连接头。

This type of adapter is used to connect two ODVA connectors. Two ends of the adapter are both spiral bayonet grooves, for matching the ODVA connectors.产品特点/Features产品展示/Product displayODVA对接款式适配器/ODVA Adapter of Terminal-Terminal ODVA端接款式适配器/ODVA Adapter of Terminal-EquipmentODVAODVA SERIESWATERPROOF CONNECTORODVA系列防水连接器ODVA系列防水连接器，是一款具有塑料外壳体保护的室外型防水光纤连接器，防水防尘等级为IP67等级。

平面小型化三频微带天线

平面小型化三频微带天线王公晗;冯全源【摘要】针对多频天线结构复杂,天线尺寸较大,设计了一款紧凑型结构的三频单极性微带贴片天线。

该天线的辐射单元由双C型结构和加载倒L型结构构成,利用低频段的高次模,从而产生天线的高频段。

该方法可以有效实现多频特性,并能够有效地减小天线尺寸。

天线尺寸仅为20×31×1.6 mm3。

实测频段为2.40~2.50 GHz,3.17~3.90 GHz,4.67~5.83 GHz。

该天线具有体积小,结构简单,辐射特性良好的优点,实现了对3.5/5.5 GHz WIMAX频段和2.4/5.2/5.8 GHz WLAN频段的全覆盖,能够很好的适用于无线通信系统的应用。

%This paper proposed a compact structure of tri-band microstrip antenna in order to solve the problems complex structure and the larger size of multi-frequency antenna.The antenna was composed by the two C-ring structures with a pair of inverted L-shaped stubs.Besides,this design utilized high-order mode to generate high frequency.This method could effectively achieve multi-frequency characteristics and reduced the antenna size. The experimental results showed that the antenna had the impedance bandwidths of 100MHz (2.40-2.50 GHz), 730MHz (3.17-3.90 GHz)and 1160 MHz (4.67-5.83 GHz),which could cover both WLAN in the 2.4/5.2/5.8 GHz bands and WIMAX in the 3.5/5.5 GHz bands.【期刊名称】《探测与控制学报》【年(卷),期】2014(000)005【总页数】4页(P64-67)【关键词】天线;三频;高次模;小型化【作者】王公晗;冯全源【作者单位】西南交通大学信息科学与技术学院，四川成都 610031;西南交通大学信息科学与技术学院，四川成都 610031【正文语种】中文【中图分类】TN8210 引言近年来，随着无线通信的迅速发展，各类天线的发展也受到越来越多的关注。

天津大学微电子学与固体电子学考研复习辅导资料及导师分数线信息

天津大学微电子学与固体电子学考研复习辅导资料及导师分数线信息天津大学微电子学与固体电子学考研科目包括政治、外语、数学一以及电路、半导体物理或电介质物理、信号与系统、物理化学。

主要研究方向有四个，每个方向不同考试科目也不同，考生备考时需分清。

专业代码、名称及研究方向考试科目备注080903微电子学与固体电子学①101思想政治理论②201英语一或202俄语或203日语③301数学一④811电路①101思想政治理论②201英语一或202俄语或203日语③301数学一④813半导体物理或电介质物理①101思想政治理论②201英语一或202俄语或203日语③301数学一④815信号与系统①101思想政治理论②201英语一或202俄语或203日语③301数学一④839物理化学天津大学微电子学与固体电子学近两年考研录取信息院（系、所）专业报考人数录取人数电子信息与工程学院（2012年）微电子学与固体电子学184 53电子信息与工程微电子学与固体193 52学院（2013年）电子学天津大学微电子学与固体电子学2012年报考人数为184人，录取人数为53人，2013年报考人数为193人，录取人数为52人。

由真题可以发现，现在考点涉及的广度和深度不断扩宽和加深。

由天津考研网签约的天津大学在读本硕博团队搜集整理了天津大学电子信息与工程学院微电子学与固体电子学考研全套复习资料，帮助考生梳理知识点并构建知识框架。

真题解析部分将真题按照知识点划分，条理清晰的呈现在同学们眼前。

然后根据各个考点的近几年真题解析，让同学对热点、难点了然于胸。

只有做到了对真题规律和趋势的把握，8—10月底的提高复习才能有的放矢、事半功倍！天津大学电子信息与工程学院微电子学与固体电子学考研导师信息刘开华纵向课题经费课题名称情境感知服务位置信息获取机理与算法 2009-01-01--2011-12-31 负责人:刘开华科技计划:国家基金委拨款单位:国家基金委合同经费:32课题名称智能航空铅封技术研究 2010-01-01--2012-12-31 负责人:刘开华科技计划:天津市科技支撑计划重点项目拨款单位:天津市科学技术委员会合同经费:50 横向课题经费课题名称基于相位法的RFID定位技术 2013-01-01--2013-12-31 负责人:刘开华科技计划: 拨款单位:中兴通信有限公司合同经费:16课题名称基于ADoc芯片组的产品开发 2008-09-01--2009-08-31 负责人:刘开华科技计划: 拨款单位:THOMSON宽带研发（北京）有限公司合同经费:6.3 期刊、会议论文Tan, Lingling; Bai, Yu; Teng, Jianfu; Liu, Kaihua; Meng, Wenqing Trans-Impedance Filter Synthesis Based on Nodal Admittance Matrix Expansion CIRCUITS SYSTEMS AND SIGNAL PROCESSINGnullTan, Lingling; Liu, Kaihua; Bai, Yu; Teng, Jianfu Construction of CDBA and CDTA behavioral models and the applications in symbolic circuits analysis ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSINGnullMa Yongtao，Zhou Liuji，Liu Kaihua A Subcarrier-Pair Based Resource Allocation Scheme Using SensorsnullMa Yongtao，Zhou Liuji，Liu Kaihua, Wang Jinlong Iterative Phase Reconstruction and Weighted IEEE sensorsnull罗蓬，刘开华，闫格基于FrFT能量重心谱校正的LFM信号参数估计信号处理null 潘勇, 刘开华，等 A novel printed microstrip antenna with frequency reconfigurable characteristics for Bluetooth/WLAN/WiMAX applications Microwave and Optical Technology Lettersnull阎格，刘开华，吕西午基于分数阶Fourier变换的新型时频滤波器设计哈尔滨工业大学学报nullLin Zhu, Kaihua Liu, Zhang Qijun, Yongtao Ma and Bo Peng An enhanced analyticalNeuro-Space Mapping method for large-signal microwave device modeling null 罗蓬，刘开华，于洁潇，马永涛一种相干宽带线性调频信号的波达方向估计新方法通信学报nullLin Zhu, Yongtao Ma, Qijun Zhang and Kaihua Liu An enhanced Neuro-Space Mapping method for nonlinear device modeling nullYue Cui, Kaihua Liu, Junfeng Wang Direction-of-arrival estimation for coherent GPS signals based on oblique projection Signal ProcessingnullLV Xi-wu, LIU Kai-hua, et al. 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with human visual system characteristics nullCai wei，李锵，关欣 Automatic singer identification based on auditory features. null 李锵，滕建辅，王昕，张雅绮，郭继昌Research of gyro signal de-noising with stationary wavelets transform null郭继昌，滕建辅，李锵，张雅绮The de-noising of gyro signals by bi-orthogonal wavelet transform nullLiu Tianlong，李锵，关欣Double boundary periodic extension DNA coding sequence detection algorithm combining base content null关欣，滕建辅，李锵，苏育挺Blind acoustic source separation combining time-delayed autocorrelation and 4TH-order cumulants null张立毅，李锵，滕建辅Kurtosis-driven variable step size blind equalization algorithm with constant module nullQin Lu，李锵，关欣Pitch Extraction for Musical Signals with Modified AMDF nullZhang Xueying，李锵，关欣 The Improved AMDF Gene Exon Prediction null李锵，Jian Dong,Ming-Guo Wang,滕建辅 Analysis and simulation of antenna protocol optimization for ad hoc networks nullFeng Yanyan，李锵，关欣Entropy of Teager Energy in Wavelet-domain Algorithm Applied in Note Onset Detection nullBao Hu, Li ShangSheng, 李锵，滕建辅Research on the technology of RFSS in large-scale universal missile ATE null张立毅，Haiqing Cheng,李锵，滕建辅 A research of forward neural network blind equalization algorithm based on momentum term null张立毅，李锵，滕建辅 A New Adaptive Variable Step-size Blind Equalization Algorithm Based on Forward Neural Network nullYutao Ma,李锵，Chao Li，Kun Li，滕建辅Design of active transimpedance band-pass filters with different Q values International Journal of Electronicsnull夏静静，李锵,刘浩澧，Wen-shiang Chen,Po-Hsiang Tsui An Approach for the Visualization of Temperature Distribution in Tissues According to Changes in Ultrasonic Backscattered Computational and Mathematical Methods in Medicinenull耿晓楠，李锵，崔博翔，王荞茵，刘浩澧超声温度影像与弹性成像监控组织射频消融南方医科大学学报null谭玲玲, 李锵, 李瑞杰, 滕建辅 Design of transimpedance low-pass filters InternationalJournal of Electronicsnull李锵，李秋颖，关欣基于听觉图像的音乐流派自动分类天津大学学报（自然科学与工程技术版）nullChong Zhou, Wei Pang, 李锵, Hongyu Yu, Xiaotang Hu, HaoZhang, Extracting the Electromechanical Coupling Constant of Piezoelectric Thin Film by the High-Tone Bulk Acoustic Resonator IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Controlnull 朱琳, 李锵, 刘开华基于ADS的声表面波单端对谐振器建模压电与声光null董丽梦, 李锵, 关欣基于稀疏表示分类器的音乐和弦识别系统研究计算机工程与应用null关欣，李锵，田洪伟基于差分全相位MFCC的音符起点自动检测计算机工程null 关欣，李锵，郭继昌，滕建辅二、四阶组合时延统计量多乐器盲分离计算机工程与应用null杨甲沛, 李锵, 刘郑, 袁晓琳基于自适应学习速率的改进型BP算法研究计算机工程与应用null李锵, 张法朝, 张瑞峰System design of DPF data recorder and data analysis null李锵, 袁晓琳, 杨甲沛Application of ant colony algorithm in the optimization of the time environmental conversion factor of the reliability models null张立毅，白煜，李锵，滕建辅复数系统中五二阶归一化积累盲均衡算法的研究通信学报null郭继昌，关欣，李锵，刘志杨红外图像预处理系统中模拟视频输出时序设计电子技术应用null关欣，滕建辅，李锵，苏育挺，Wang Shu-Yan Blind source separation combiningtime-delayed second and fourth order statistics 天津大学学报（自然科学与工程技术版）null 张立毅，李锵，滕建辅复数系统中三、二阶归一化累积量盲均衡算法的研究计算机工程与应用null张立毅，李锵，滕建辅经典盲均衡算法中稳态剩余误差的分析天津大学学报null 滕建辅，董健，李锵，关欣Design of maximally flat FIR filters based on explicit formulas combined with optimization 天津大学学报（英文版）null郭继昌，陈敏俊，李锵，关欣红外焦平面失效元处理方法及软硬件实现光电工程null 马杰，王昕，李锵，滕建辅基于特征值和奇异值分解方法的盲分离天津大学学报（自然科学与工程技术版）null李锵，郭继昌，关欣，滕建辅基于通用DSP的红外焦平面视频图像数字预处理系统天津大学学报（自然科学与工程技术版）null李锵，郭继昌，关欣，刘航，童央群基于DSP的红外焦平面视频图像数字处理系统的设计测控技术null马杰，滕建辅，李锵具有参考噪声源的多路传感器信号盲分离方法测控技术null 周郭飞，李锵，滕建辅微带扇形分支线在低通滤波器设计中应用电子测量技术null 李锵，滕建辅，李士心，肖志涛小波域Wiener滤波器信号的去噪方法天津大学学报（自然科学与工程技术版）null肖志涛，于明，李锵，唐红梅，国澄明 Log Gabor小波性能分析及其在相位一致性中应用天津大学学报（自然科学与工程技术版）null罗批，李锵，郭继昌，滕建辅Improved genetic algorithm and its performance analysis 天津大学学报（英文版）null罗批，郭继昌，李锵，滕建辅一种实用的电子线路参数优化算法电路与系统学报null 罗批，李锵，郭继昌，滕建辅基于偏最小二乘回归建模的探讨天津大学学报null 知识产权李锵，闫志勇，关欣一种结合SVM和增强型PCP特征的和弦识别方法中国2014100089231李锵, 冯亚楠, 关欣基于Teager能量熵的音符切分方法学术专著(关欣, 杨爱萍, 白煜, 李锵), 信号检测与估计:理论与应用（译著）, 电子工业出版社2012-01-31(白煜, 李锵), 模拟集成电路设计的艺术(译著), 人民邮电出版社 2010-11-04(李锵，周进等), 无线通信基础（译著）, 人民邮电出版社 2007-06-30(李锵，董健，关欣，鲍虎), 数字通信（原书第2版）（译著）, 机械工业出版社 2006-02-28 (张为，关欣，刘艳艳，李锵), 电子电路设计基础（译著）, 电子工业出版社 2005-10-01 (张雅绮，李锵等), Verilog HDL高级数字设计（译著）, 电子工业出版社 2005-01-31 (李锵，侯春萍，赵宇), 网络（原书第2版）（译著）, 机械工业出版社 2004-11-30(李锵，郭继昌), 无线通信与网络, 电子工业出版社 2004-06-30本文内容摘自《天津大学814通信原理考研红宝书》，更多考研资料可登陆网站下载！。

PULSE ANTENNAS 指南

现货库存、技术资料、百科信息、热点资讯，精彩尽在鼎好!Pulse's new line of wireless access point antennas offers flexible and economical solutions for wireless device OEMs. These antennas offer superior transmission and reception between wireless access points. They are compatible with IEEE 802.11a/b/g/n, Bluetooth and ZigBee applications, as well as other products that utilize ISM frequency bands. All wireless access point antennas are RoHS compliant. For high-volume orders, Pulse can custom design antennas for OEMs. This includes alternative frequencies and a variety of cables/connectors for antenna assemblies. Pulse also manufactures build-to-print internal antennas that feature a variety of stamped metal and PCB configurations.Pulse's wide array of antenna selections provide solutions to GSM, CDMA, WCDMA, WiMax, WiFi TM , GPS, ZigBee TM , Bluetooth ®,UWB, ISM, DVB-H, MediaFLO TM , DMB-S, Satellite Radios, DECT and other custom applications. Please pick antennas from these charts at /index.php?271. Click on the part number to access the corresponding data sheet.Please contact Pulse for additional information on products not covered in this catalog.Part Frequency Max Mechanical Application/Standar dNumber Gain (dBi)Length3W1047900MHz 1.0 6.65/169ISM 900MHz W1063900MHz 3.0 6.65/169ISM 900MHzW1030 2.4GHz 2.0 3.25/82.5802.11b/g/n, Bluetooth, ZigBee W1031 2.4GHz 2.0 3.25/82.5802.11b/g/n, Bluetooth, ZigBee W1034 2.4GHz 2.0 4.21/107802.11b/g/n, Bluetooth, ZigBee W1037 2.4GHz 3.2 6.65/169802.11b/g/n, Bluetooth, ZigBee W1038 2.4GHz 4.9 6.65/169802.11b/g/n, Bluetooth, ZigBee W10272.4GHz3.24.88/124802.11b/g/n, Bluetooth, ZigBee1.Antennas come standard with R-SMA connectors, unless otherwise specified.2.These part numbers are lead-free and RoHS compliant. No additional suffix or identifier is required.3.Inches /millimetersPart F requency Max Mechanical Application/StandardNumber (GHz)Gain (dBi)Length 3W1043 2.4 & 5.0 2.0 4.59/117802.11a/b/g/n, Bluetooth, ZigBee W1045 2.4 & 5.0 2.0 4.13/105802.11a/b/g/n, Bluetooth, ZigBee W10285.15 & 5.852.04.88/124802.11a/b/g/n, ISM 5.8GHz1.Antennas come standard with R-SMA connectors, unless otherwise specified.2.These part numbers are lead-free and RoHS compliant. No additional suffix or identifier is required.3.Inches /millimetersSingle-Band 1,2Dual-Band 1,2Antennas for Wireless Access PointSolutions for Mobile Phone AntennasPulse´s customized antennas for mobile phones are based on a thorough knowledge of the design of modern handsets, the antenna requirements, and the challenges of devices functioning in multiradio environments.Pulse has extensive experience in main antenna design and utilizes technologies such as sheet metals, flex radiators and ceramic solutions. Pulse products offer optimal and well-proven solutions for each application and form factor.The product range for mobile phones includes main and complementary antennas and integrated antenna modules.ANTENNASHelical AntennasCeramic AntennasInternal and Surface Mount Antenna SolutionsPulse offers a wide range of standardized internal and surface mount antennas (SMD) for wireless device applications. Pulse’s ceramic technology results in robust antenna designs that have outstanding performance. These antennas have an inherent immunity to surrounding antenna signals and hand-effect, making them exceptionally suitable solutions for small hand-held devices with multiple antennas. Pulse's helical antenna technology provides high-performance antennas in a small package that can be easily deployed. These ceramic and helical antennas require minimal ground plane removal for operation, which means saved board space and economical implementation. The SMD compatibility of Pulse’s antenna products makes them simple and easy to mount.2.Impedance 50 Ω, operating temperature -40°C to +85°C3.GC = Ground Clearance, mm5.⎯ = NAANTENNASThe Larsen antenna product line offers the highest quality, most reliable antennas in the automotive industry. The Larsen antennas combine premium materials with high efficiency designs, which deliver antennas with superior mechanical durability and electrical performance. UV, chemical and impact resistant Makroblend ®bases help ensure the highest performance for all your mobileapplications. “Traditional-style” mobile antennas are available from 27 MHz to 5.9 GHz, as well as many “multi-band” designs. Whether you need communication interoperability, radio communication, data transmission, increased cellular/PCS coverage or GPS tracking,Larsen antennas are the solution.Larsen antennas consist of over 1000 different automotive antenna options. Please contact the factory for more information or to order an all-inclusive catalog at ********************.com or call 800-268-3662.LARSEN ® ANTENNASSingle-Band 1Multi-Band 1NMOWB150C 135-1742NMO Wide Band 451.75/1314⎯⎯NMO450C 450-750 5.6NMO UHF Field Tunable 433/838⎯⎯LP800NMO 806-9602NMO Low Profile 4 1.25/32⎯⎯NMOQW900890-9702NMO 1/4 Wave 4 3/76⎯⎯GPSGM1575.4 5 dBic GPS Glass Mount 1.7/43RG-174⎯NMO5E2400B2400-25005NMO Whip 48.54/217⎯⎯1.Antennas available in multiple frequencies and mounting options. 3.Variety of connectors available. Order separately.2.Variety of coax available. Order separately. 4.All NMO antennas require an NMO mount for installation.1.Antennas available in multiple frequencies and mounting options. 3.Variety of connectors available. Order separately.2.Variety of coax available. Order separately. 4.All NMO antennas require an NMO mount for installation.Part Frequency Gain Description Length Coax 2Connector 3Number (MHz)(dBi)(in /mm)Part Frequency Gain DescriptionLength Coax 2Connector 3Number (MHz)(dBi)(in/mm)NMO150/450/800150-165/450-470/806-940-7/0/1NMO Tri Band 416.5/419⎯⎯KGC/P3EUD824-896/1850-19905.2/5.2Glass Mount Dual Band 13330RG-58U Dual ShieldNo Conn LPT825/18NMOHF 806-960/1710-1990/24003/4/3Low Profile Transit 43.5/89⎯⎯MMC/P3EFME 824-960/1850-19904/4Dual Band Magnetic Mount 5/127RG-58 Low Loss Dual ShieldFME NMOC/P3E 824-960/1850-19904/4Dual Band NMO Mount 4 4.7/119⎯⎯GPSCPOO 824-960/1710-1990/1575.422/2/4.5dBic Direct Feed GPS Tri Band 7.6/193RG-174TNC/SMA GPSCWCPOO824-960/1710-1990/1575.422/1.5/4.5dBicRoof Mount GPS Tri Band3.9/99RG-174TNC/SMAAutomotive Single-Band SolutionsAutomotive Multi-BandSolutionsWIRELESS APPLICATIONSNMO Mounting Kits 1NMOKHFUD NMO Low /High Frequency Mount17/5.18 RG-58/U Dual Shield, Low Loss Cable NO CONN NMOKHFUDTHK NMO Low /High Frequency Thick Mount 17/5.18RG-58/U Dual Shield, Low Loss Cable NO CONN NMOMMRNOCONNNMO Low /High Frequency Magnetic Mount12/3.66RG-58 A /U cableNO CONNPart DescriptionCable Length Coax T ypeConnector Number (ft/m)1.All NMO mounting kits are available with a variety of cables and connectors.Pulse’s Larsen antennas also offer a complete line of portable/terminal antennas for wireless applications. These antenna solutions are perfect for data transmission for various networking applications. Pulse’s Larsen antennas also offer portable/terminal antennas for routers and access points in 800/900 MHz, 1700-1900 MHz and 802.11a/b/g frequencies.The ultra-slim stealth blade allows mounting virtually anywhere without obstruction - in vehicles for voice and data, mobile computing or other mobile/portable terminal applications. SPDA models are true sleeve dipole designs optimized for no-ground-plane environments found in portable and terminal applications. Models have an articulated right angle/360 degree swivel connector. They are ideal for any portable, hand-held terminal or cordless base application such as wireless Point-of-Sale, WLAN or cordless PDX.Larsen antennas offer a variety of portable/terminal antennas with various terminations for use with most popular radio brands as well as many wireless applications. For more information on these antennas or to order an all-inclusive catalog, please e-mail Pulse, at:********************.com , or call 800-268-3662.LARSEN ® ANTENNASSingle-Band Wireless Access Point AntennasR380.500.1092400-25002Cordless Base, Straight Dipole3.5/89NA SMA Plug SB450FME3450-470 2.14Stealth Blade 10/2543' RG-316FME SB8003806-896 2.14Stealth Blade 2.5/1323' RG-174No Conn SB9003890-960 2.14Stealth Blade 2.5/1323' RG-174No Conn SB240032400-2500 2.14Stealth Blade2.5/1323' RG-174No Conn SPDA24832824-894⎯Center Fed Dipole, Articulating Right Angle 9/229NA SMA SPDA24918890-960⎯Center Fed Dipole, Articulating Right Angle 8/203NA SMA M T2SPDA2418001710-1880⎯Center Fed Dipole, Articulating Right Angle 6.5/165NA SMA M T2SPDA2419001850-1990⎯Center Fed Dipole, Articulating Right Angle 6.5/165NA SMA M T2SPDA2424002400-2500⎯Center Fed Dipole, Articulating Right Angle6/152NA SMA SPDP24832824-894⎯Center Fed Dipole, Straight 8/203NA SMA M T2SPDP24918890-960⎯Center Fed Dipole, Straight 2.75/70NA SMA M T2SPDP2424002400-2500⎯Center Fed Dipole, Straight 3.5 / 89NA SMA M T2SPWB23150136-174⎯Helical, Standard, 1/4 Wave 6.75/171NA SMA F T3SPWB23425380-470⎯Helical, Standard, 1/4 Wave 6.5/165NA SMA F T3SPWH23832782-882⎯Whip, Standard, 1/4 Wave 3/76NA SMA F T3SPWH23918863-973⎯Whip, Standard, 1/4 Wave 3/76NA SMA F T3SPHS24832800-864⎯Helical, Standard, 1/4 Wave3/76NASMA F T21.UHF and VHF portable/terminal antennas also available.Part Frequency Gain DescriptionLength Coax 1Connector 1Number (MHz)(dBi)(in /mm)Single-Band Wireless Access Point SolutionsNMOMounting KitsMulti-Band Wireless Access Point AntennasR380.500.3142400-2500/4900-5900 1.6/5Swivel Mount Dipole 7.15/18222N/A RPTNC R380.900.323806-960/1710-19992/2Stealth Blade5/127 10' RG-174FME SPDA24850/1900824-894/1850/1990_Center Fed Dipole, Articulating Right Angle7.5/191N/ASMA1.Additional cable length and connector options available.2.MAXPart Frequency Gain DescriptionLength Coax 1Connector 1Number (MHz)(dBi)(in /mm)Multi-Band Wireless Access Point SolutionsLARSEN ® ANTENNAS。

Array (Smart) Antennas Improve GSM Performance

Array (Smart) Antennas Improve GSM Performance Cornelius A. D. Pahalson;Nuhu Habila;Hyat Markus Gaga【期刊名称】《International Journal of Communications, Network and System Sciences》【年(卷),期】2024(17)1【摘要】As wireless data applications over cellular networks become more widespread, the pressure to increase capacity will become even more intense. Capacity in the 800 and 900 MHz bands, where bandwidth is restricted, is already becoming a limiting factor. This paper attempts to address how the application of smart antenna systems has brought about improvements in call quality and increased capacity through reduced Interference in Mobile Communication. The smart antenna may be in a variety of ways to improve the performance of a communications system. Perhaps most importantly is its capability to cancel co-channel interference. It helps in improving the system performance by increasing the channel capacity, spectrum efficiency, extending range coverage, speech quality, enabling tighter reuse of frequencies within a cellular network and economically, feasible increased signal gain, greater, reduced multipath reflection. It has been argued that Smart antennas and the Algorithms to control them are vital to a high-capacity communication system development.【总页数】10页(P1-10)【作者】Cornelius A. D. Pahalson;Nuhu Habila;Hyat Markus Gaga【作者单位】Department of Science, School of Science and Technology, Plateau State Polytechnic, Barkin Ladi, Nigeria【正文语种】中文【中图分类】TN9【相关文献】1.OPTIMAL DESIGN OF SMART ANTENNA ARRAY2.Analysis of electrical performances of planar active phased array antennas with distorted array plane3.Review of Research Techniques to Improve System Performance of Smart Antenna4.An improved peak side lobe reduction method for linear array antenna for military applications5.An Optimized Design of Antenna Arrays for the Smart Antenna Systems因版权原因，仅展示原文概要，查看原文内容请购买。

英语渐变类系表结构的句子

英语渐变类系表结构的句子1、The Development Of A Real-Time Transmittance Measuring System For Linear Variable Neutral Density Filters线性渐变滤光片透过率实时测量系统2、Research On Novel Ultra-Wideband Linear Tapered Balancer And Impedance Transformer新型超宽带线性渐变平衡器及阻抗变换器的研究3、GI(Grated Index)渐变折射线(光纤)4、Space (Density) Tapered Array Antenna间距密度渐变阵列天线5、The Path Grew More Obscure In The Fading Light、小径在渐渐消失的光线下变得更暗了。

6、Calculations Of 3-D Nonlinear Beam-Wave Interaction In Traveling Wave Tube With Dynamic Velocity Taper Helix动态渐变技术螺旋线行波管三维非线性互作用的计算7、Oscillation And Asymptotic Behavior Of Solutions Of First Order Linear Difference Equations With Oscillatory Coefficients;具变号系数的一阶线性差分方程的解的渐近性与振动性8、Select The Radial Gradient From The Tools Option、在属性栏上设置渐变模式为"径向渐变"、9、Dual-Band Tapered Slot-Line Antenna For WiMAX BaseStation用于WiMAX基站的双频段渐变槽线天线。

森海塞尔 EW-D SKM-S BASE SET 基本套装 1 7 产品规格 (V1.6)说明书

DELIVERY INCLUDES• EW-D EM rack receiver• EW-D SKM-S handheld transmitter • MZQ 1 microphone clamp • 2 rod antennas• power supply with country adapters • rackmount set • 4 rubber feet • quick guide • safety guide• manufacturer declaration sheetVersatile and feature-rich digital wireless system for those who sing, speak or play instruments that allows for seamless product pairing and management via the EW-D Smart Assist App.With a metal housing, the robust handheld transmitter suits perfectly for daily use on stage.FEATURES• Digital wireless eliminates noise, interference andstatic bursts • UHF transmission greatly enhances range, reliabilityand scalability • Mobile App streamlines setup and operation and elimi-nates complicated menus • Automated setup creates reliable connections withminimal time and effort • Up to 2,240 selectable frequencies• Transmission range: up to 100 m in an ideal environ-ment (without obstacles)• Lithium Ion battery pack delivers up to 12 hours of ope-ration (up to 8 hours of operation with AA batteries)• 56 MHz Bandwidth will allow for up to 90 channels • Preserves every detail of even the most dynamic per-formances with 134 dB transmitter dynamic rangeACCESSORIESEW-D ASA (Q-R-S)Active Antenna Splitter 470 - 694 MHz Art. no. 508879EW-D ASA (T-U-V-W)Active Antenna Splitter 694 - 1075 MHz Art. no. 508880EW-D ASA (X-Y)Active Antenna Splitter 1350 - 1805 MHz Art. no. 508881EW-D ASA CN/ANZ (Q-R-S)Active Antenna Splitter 470 - 694 MHz Art. no. 508998EW-D AB (Q)Antenna Booster 470 - 550 MHz Art. no. 508873EW-D AB (R)Antenna Booster 520 - 608 MHz Art. no. 508874EW-D AB (S)Antenna Booster 606 - 694 MHz Art. no. 508875EW-D AB (U)Antenna Booster 823 - 865 MHz Art. no. 508876EW-D AB (V)Antenna Booster 902 - 960 MHz Art. no. 508877EW-D AB (Y)Antenna Booster1785 - 1805 MHz Art. no. 508878ADP UHF (470 - 1075 MHz)Passive directional antenna470 - 1075 MHzArt. no. 508863BA 70Rechargeable battery pack for SK and SKM-S Art. no. 508860L 70 USBCharger for BA 70 rechargeable battery packArt. no. 508861EW-D CHARGING SET Set of L 70 USB charger and 2 BA 70 rechargeable battery packs Art. no. 508862EW-D COLOR CODING SET Colored labels for wireless link identification for EM, SKM-S, SK Art. no. 508989EW-D SK COLOR CODING Colored labels for wireless link identification for SK Art. no. 508990EW-D SKM COLOR CODING Colored labels for wireless link identification for SKM-S Art. no. 508991EW-D EM COLOR CODINGColored labels for wireless link identification for EMArt. no. 508992PRODUCT VARIANTSEW-D SKM-S BASE SET (Q1-6)470.2 - 526 MHz Art. no. 508760EW-D SKM-S BASE SET (R1-6)520 - 576 MHz Art. no. 508761EW-D SKM-S BASE SET (R4-9)552 - 607.8 MHz Art. no. 508762EW-D SKM-S BASE SET (S1-7)606.2 - 662 MHz Art. no. 508763EW-D SKM-S BASE SET (S4-7)630 - 662 MHz Art. no. 508764EW-D SKM-S BASE SET (S7-10)662 - 693.8 MHz Art. no. 508765EW-D SKM-S BASE SET (U1/5)823.2 - 831.8 MHz & 863.2 - 864.8 MHz Art. no. 508766EW-D SKM-S BASE SET (V3-4)925.2 - 937.3 MHz Art. no. 508768EW-D SKM-S BASE SET (Y1-3)1785.2 - 1799.8 MHzArt. no. 508769MICROPHONE COMPATIBILITYMicrophone modules compatible with the EW-D SKM-S handheld transmitterMMD 835-1Dynamic microphone module with cardioid polar patternMMD 845-1Dynamic microphone module with supercardioid polar patternMME 865-1Pre-polarized condenser microphone module with supercardioid polar patternMMD 935-1Dynamic microphone module with cardioid polar patternMMD 945-1Dynamic microphone module with supercardioid polar patternMMK 965-1Condenser microphone module with switchable cardioid and supercardioid polar pattern MMD 42-1Dynamic microphone module with omni-directional polar patternNeumann KK 204Condenser microphone module with cardioid polar patternNeumann KK 205Condenser microphone module with supercardioid polar patternMM 435Dynamic microphone module with cardioid polar patternMM 445Dynamic microphone module with supercardioid polar patternME 9002Pre-polarized condenser microphone module with omni-directional polar patternME 9004Pre-polarized condenser microphone module with cardioid polar patternME 9005Pre-polarized condenser microphone module with supercardioid polar patternSystemAudio link frequency ranges Q1-6R1-6R4-9S1-7S4-7S7-10U1/5V3-4Y1-3470.2 - 526 MHz520 - 576 MHz552 - 607.8 MHz606.2 - 662 MHz630 - 662 MHz662 - 693.8 MHz823.2 - 831.8 MHz &863.2 - 864.8 MHz925.2 - 937.3 MHz1785.2 - 1799.8 MHzBluetooth® Low Energy(BLE) frequency range2402 - 2480 MHzAudio frequency response20 Hz - 20 kHz (-3 dB)@ 3 dBfsAudio THD≤ -60 dB for 1 kHz@ -3 dBfs input level Operating temperature-10 °C - +55 °C(14 °F - 131 °F)Relative humidity 5 - 95 % (non-condensing)EW-D EM (Rack Receiver)Input voltage11 - 13 V ⎓Input current≤ 300 mATransmit power (radiated)BLE: max. 10 mW EIRP Audio output power18 dBu max. Dimensions212 x 44 x 189 mm(8.35" x 1.73" x 7.44")Weight (without antennas and power supply)approx. 1000 g (2.2 l bs)EW-D SKM-S (Handheld Transmitter)Input voltage 2.0 - 4.35 VInput current< 300 mAPower supply 2 AA batteries 1.5 V (al-kali manganese) or BA 70rechargeable battery packOccupied bandwidth200 kHzTransmit power (radiated)Audio link: 10 mW ERP(Range Y1-3: 12 mW ERP)BLE: max. 10 mW EIRPDimensions (ø x l)(incl. MMD 835 microphonemodule)(without microphonemodule)50 x 268 mm (1.97" x 10.55")40 x 200 mm (1.57" x 7.87")Weight (without batteries)(incl. MMD 835 microphonemodule)(without microphonemodule)approx. 304 g (0.67 l bs)approx. 195 g (7.14 lbs)SPECIFICATIONSSet in packagingDimensions405 x 350 x 73 mm(15.91" x 13.78" x 2.87") Weight 2.9 kg (6.39 lbs)DIMENSIONSEW-D EMDIMENSIONSMikrofonmodul MMD835 - nur Beispiel EW-D SKM-SARCHITECT‘S SPECIFICATIONEW-D EM rack receiverThe stationary receiver with switching diversity technology shall be for use with a companion transmitter as part of a digital wireless RF transmission system.The receiver shall operate within ten UHF frequency ranges, with a switching bandwidth of up to 56 MHz: 470.2 – 526 M Hz, 520 – 576 MHz, 552 – 607.8 MHz, 606.2 – 662 M Hz, 630 – 662 MHz, 662 – 693.8 MHz, 823.2 – 831.8 M Hz, 863.2 – 846.8 MHz, 925.2 – 937.3 MHz, 1785.2 – 1799.8 MHz; selectable frequencies shall be up to 2,240. The receiver shall feature Bluetooth® Low Energy (BLE) at a frequency range between 2402 and 2480 M Hz for remote controlling the devices via a control App for iOS and And-roid.The audio frequency response shall be between 20 H z and 20 k Hz (-3 d B) @ 3 d Bfs. Audio total harmonic distortion (THD) shall be ≤ -60 d B for 1 k Hz @ -3 d Bfs input level. Dynamic range shall be 134 dB.The receiver shall be menu-driven with a backlit LC display showing the current frequency, channel number, mete-ring of RF level, metering of AF level, lock status, muting function, mute lock status, antenna switching diversity, app connection, gain, audio output level, menu and battery status of the associated transmitter. An auto-lock feature shall be provided to prevent settings from being acciden-tally altered.The receiver shall feature a balanced XLR-3M audio output with a maximum output of +18 d Bu along with an unbalan-ced ¼“ (6.3 m m) audio output with a maximum output of +12 d Bu. Two BNC-type input sockets shall be provided for connecting the antennas.The receiver shall operate on 12 V power supplied from the power supply unit or from a Sennheiser EW-D ASA an-tenna splitter. Power consumption shall be ≤ 300 m A. The receiver shall have a rugged metal housing; dimensions shall be approximately 212 x 44 x 189 m m (8.35“ x 1.73“ x 7.44“). Weight shall be approximately 1000 g rams (2.2 l bs) without antennas and power supply. Operating tempera-ture shall range from −10 °C to +55 °C (+14 °F to +131 °F). The receiver shall be the Sennheiser EW-D EM.EW-D SKM-S handheld transmitterThe handheld transmitter shall be for use with a compa-nion receiver as part of a digital wireless RF transmission system.The handheld transmitter shall operate within tenUHF frequency ranges, with a switching bandwidth ofup to 56 M Hz: 470.2 – 526 M Hz, 520 – 576 MHz, 552– 607.8 M Hz, 606.2 – 662 M Hz, 630 – 662 MHz, 662 – 693.8 M Hz, 823.2 – 831.8 M Hz, 863.2 – 846.8 MHz, 925.2 – 937.3 MHz, 1785.2 – 1799.8 MHz; selectable frequencies shall be up to 2,240.The audio frequency response shall be between 20 H z and 20 k Hz (-3 d B) @ 3 d Bfs. Audio total harmonic distortion (THD) shall be ≤ -60 d B for 1 k Hz @ -3 d Bfs input level. Dynamic range shall be 134 dB.A programmable mute switch shall be provided to mute or unmute the audio signal.The handheld transmitter’s parameters shall be configu-rable in the associated receiver’s menu and synchronized with the handheld transmitter via Bluetooth Low Energy (BLE).Power shall be supplied to the handheld transmitter by two 1.5 V A A size batteries or by one Sennheiser BA 70 rechar-geable battery pack. Operating time shall be typically12 hours with a battery pack and up to 8 hours with AA batteries.Occupied bandwidth shall be 200 k Hz. Transmit power (radiated) shall be 10 mW ERP (1785.2 – 1799.8 MHz Range: 12 m W ERP).The handheld transmitter shall have a rugged metal housing; dimensions shall be approximately 50 m m (1.97“) in diameter and 268 m m (10.55“) in length including a Sennheiser MMD 835 microphone module. Weight inclu-ding MMD 835 microphone module shall be approximately 304 g rams (0.67 l bs). Operating temperature shall range from −10 °C to +55 °C (+14 °F to +131 °F).A range of different microphone heads shall be available for the handheld transmitter.The handheld transmitter shall be the Sennheiser EW-D SKM-S.Sennheiser electronic GmbH & Co. KG · Am Labor 1 · 30900 Wedemark · Germany · 。

Antenna Installation Guide

Antenna Installation Guide1.Pre Installation1.1Antenna PlacementThe antenna should always be installed in a position where it has a clear view of the satellites in the sky. When surveying a site prior to installation, consider any fixed or moving obstructions which may affect GNSS reception (E.g. Terrain, Pylons, mobile obstructions…). Avoid close proximity to antennas from other services where possible. The antenna has excellent rejection characteristics to out-of-band signals, as does the GNSS receiver, but high-powered RF signals in close proximity to the antenna may swamp the very low-level signals from the GNSS satellites.1.2Reducing the risk of lightning strikeThe first line of protection against the effects of lightning-induced surge eventsinvolves positioning the antenna in a “lightning-protected zone”. In practice,thismeans ensuring that there is at least one other earth-bonded structure located inthe same rooftop area (e.g. another antenna, or a lightning rod) that reachessignificantly higher than the top of the GNSS antenna. The GNSS Antenna shouldthen be mounted so that it lies within a 45-degree angle from the top of the otherearth-bonded structure. The GNSS antenna mount itself should also be securelybonded directly to the building protection earth – and not connected via any of theother earthed structures. By following the directions above you will reduce the riskof lightning strike. However, there is no fail-safe way of preventing lightning strike.A lightning arrestor should be installed to reduce the risk of damage caused in thisinstance.1.3Lightning ProtectionAt installations where lightning frequently occurs, it is prudent to install a lightning arrestor between the antennaand clock. Tekron's antenna lightning protection kit provides additional protection through the use of an impulsesuppressor. In the event of a lightning derived high voltage surge occurring, the impulse suppressor activates,short-circuiting the cable directly to earth.For the lightning protector to be effective, it must be firmly mounted to a conductive metal surface that is itselfbonded to the building protective earth. Ensure that a good electrical connection is made between the surgeprotector and the earthing system. All earthing connections should be as short as possible, should have no sharpbends or loops, and should use at least a 4mm2 stranded copper wire for earthing the lightning arrestor. The preferred mounting position is on the inside of the building’s exterior wall, adjacent to the antenna lead entrypoint.2.Antenna and Cable Installation2.1GNSS AntennaTekron’s standard shipping configuration includes an active GNSS antenna, specifically designed for industrial/static timing environments, together with a pipe-mounting plinth. The mechanical diagram below shows the antenna and pipe mounting plinth attached.The antenna pipe-mounting plinth is designed to fit over the top of a pipe like a capping. The mount has an internal diameter of 43mm, to fit a pipe with external diameter of between 40 and 42mm (1¼inch / 32mm nominal ID galvanized pipe). The top end of the pipe should be cut flat, so that the rubber gasket inside the antenna mount sits flush against it, forming an effective weather seal. The mount is fixed to the pipe with two stainless steel M8 hexagon- socket setscrews (supplied).2.2Antenna mounting bracketThe antenna pipe-mounting plinth is designed to fit over the top of a user-supplied pipe like a capping. The pipe should have an external diameter of between 40 and 42mm (1¼inch / 32mm nominal ID galvanized pipe). The top end of the pipe should be cut flat, so that the rubber gasket inside the antenna mount sits flush against it, forming an effective weather seal.Establish the mounting method for the pipe, such as strapping or bolting to a frame on the edge of the building, or strapping to an air conditioning exhaust or similar. The base of the pipe needs to be accessible for the cable entry, if this is not practical, then a hole or slot can be made in the side of the pipe to allow the cable to enter and be passed up to the top of the pipe.An adjustable antenna mounting bracket can be ordered from Tekron. See section 2.7 for specifications.2.3Antenna cableCalculate the cable length required between the antenna and GNSS Clock, allowing 5 –10% extra for contingencies.Tekron clocks can be ordered with 15, 30, or 60 meters of high performance RF cable factory-fitted with a TNC-type male connector at one end, and a SMA male connector at the other. The TNC-type connector mates with the connector on the antenna and provides a robust weather-resistant connection. The smaller SMA connector mates with the connector on the GNSS clock rear panel and is only fractionally larger in diameter than the cable itself; this facilitates installation in conduit and through small apertures.Custom lengths can be ordered upon request however additional costs may be incurred.Where antenna cable distance exceeds 60 meters, either lower loss (e.g. CNT-400) cable can be used or an in-line amplifier can be installed. Contact Tekron for further advice.2.4Antenna cable installationWhile the cable shielding is excellent, the cable should not be routed in close proximity to power cables or other RF cables carrying transmitter signals – in particular, parallel runs are to be avoided if possible. If such runs are absolutely unavoidable, a minimum separation of 300 mm may be used as a guideline.The GNSS receiver has excellent out of band rejection characteristics, as does the antenna itself. However, sound engineering practice should not rely on these factors alone to guarantee performance. Careful installation will enhance the long-term reliability and on-going stability of the clock.The absolute minimum bend radius for the antenna cable supplied is 40mm, but it is preferable to use a larger radius if possible. Caution should be taken at all times during the installation of the cable to avoid crushing or shorting the cable.2.5GNSS antenna installationFeed the antenna cable up the mounting bracket/ pipe from the bottom end, through the plinth, and connect directly to the TNC connector on the base of the antenna. It is advisable to wrap self-amalgamating tape around the connector to seal the connection and provide protection against moisture ingress.Fasten the antenna to the plinth using the four stainless screws supplied with the kit. The complete antenna assembly can then be placed on the mounting bracket/ pipe and secured by tightening the grub screws on the side of the plinth using the supplied Hex key.2.6Installing the lightning protection kit (when applicable)The lightning protector must be firmly mounted to a conductive metal surface that is itself bonded to the building protective earth. Ensure that a good electrical connection is made between the surge protector and the earthing system. All earthing connections should be as short as possible, should have no sharp bends or loops.The preferred mounting position is on the inside of the building’s exterior wall, adjacent to the antenna lead entry point.2.7Adjustable Antenna Mounting BracketThe steel adjustable antenna mounting bracket will assist in the dissipation of energy should the antenna be struck by lightning. The mounting bracket should be securely bonded directly to the building protection earth –and not connected via any of the other earthed structures.2.8Antenna Cable2.9Lightning Protection KitThe NexTek FPL series of protectors reduce lightning transients to very low voltage levels and pass dc through as well. Fine-protectors are usually necessary on sensitive receiver lines that must pass dc, or need protection Through Current 1 A。

Leica_TS15用户手册

Leica TS15
用户手册
版本 3.1 中文
简介
购买祝贺您购买了 Leica TS15。本手册包括了重要的安全指南，可指导您安全地安装并使用仪器。详情请参见 "6 安全指南 "。请您在使用本产品之前仔细阅读用户手册。仪器标识仪器的型号和序列号标注在仪器标签上。请将仪器型号和序列号填写在下面。当您需要与经销商或 Leica Geosystems 授权的维修部门联系时，将会用到这些信息。类型：序列号：符号 _______________ _______________
7.9 7.10
7.11 7.12 7.13 8 索引
软件许可协议
TS15, 目录
5
1
1.1
系统组成
系统描述
系统组成
LG O
003962_001
TS15
CS15
一般性描述主要组件
TS15 共同术语，描述全站仪 Leica Viva Series。组件 TS15 仪器描述 • • • • 一款可进行测量，计算以及采集数据的全站仪。包含多种不同精度级别的仪器。集成 GNSSGNSS 系统，可构成 SmartStation。结合多功能的 CS10/CS15 外业手簿实现遥控测量。
本手册中的符号含义：类型描述表示一个可能遇到的危险情形，如果不加以避免，将导致严重伤害甚至死亡事故。表示潜在的或操作不当所致的危险情况，如果不加以避免，将造成伤亡或严重损害。表示潜在的或操作不当所致的危险情况，如果不加以避免，将造成伤亡或严重损害表示潜在的或操作不当所导致的危害，如果不加以避免，将导致轻微的人身伤害或明显的设备、经济损失和环境的损害。表示在实际使用中必须注意的重要章节，以便能够正确、有效地使用该仪器。

Ruckus ZoneFlex 2942 802.11g Wi-Fi接入点说明书

the environment. This means fewer APs, more satisfied users, and a cost-effective system that can be installed anywhere by wireless novices.Deployed individually, or as a system centrally managed by the Ruckus ZoneDirector ™ Smart WLAN family of control-lers, the Ruckus ZoneFlex 2942 can be deployed with or without Ethernet cabling. Support for Ruckus Smart Mesh Networking streamlines costly and complex deployment headaches, eliminating the need to run Ethernet cabling to every access point. This minimizes operational overhead, making the ZoneFlex 2942 ideal for hotels, schools, airports and enterprises everywhere.Smart Wi-Fi 802.11g Access PointNo RF expertise requiredSmart antenna array eliminates AP placement issues and minimizes adjacent AP interference, while ZoneDirector controls dynamic channel assignment and power management.Optimized for voice over Wi-FiSpecialized antenna design, dynamic signal path selection and preci-sion QoS software optimize delay-sensitive, high-density Voice-over-Wi-Fi (VoFi) applications. Power Save (UAPSD) maximizes handset battery life.“IT lite” configuration and managementWeb-based wizard enables configuration of multiple APs across the entire WLAN in minutes. Once configured, the WLAN manages itself.ZoneFlex ™2942A patented smart antenna array integrates six high-gain vertically-polarized and six horizontally-polarized antenna elements. This enables up to 4096 potential antenna combinations and up to 9 dBi gain, thereby delivering unprecedented range extension and signal reliability. The dual polarized smart antenna increases the effectiveness of spatial-multiplexing, resulting in higher data rates.An intuitive web-based wizard in the RuckusZoneDirector enables quick and easy configuration of each ZoneFlex 2942 in a matter of minutes.AC powerExternal RP-SMARF Connector10/100802.3 af PoESoft reset10/100Ethernet Patented BeamFlex ™ Technology Extends Signal Range, Improves Stability of Client ConnectionsThe ZoneFlex 2942 Smart Wi-Fi access point integrates a software-controlled smart antenna array that delivers 9 dBi of signal gain and 20 dBi of interference rejection. This allows a 2 to 4x improvement in signal range and a reduction in packet loss from the ability to automatically avoid interference and obstacles.Advanced WLAN Applications with Smart/OSWhen used with the Ruckus ZoneDirector Smart WLAN controller, the ZoneFlex 2942 supports a wide range of value-addedapplications such as guest networking, Smart Wireless Meshing, Dynamic PSK, hotspot authentication, wireless intrusion detectionand many more. With Smart/OS, up to 32 discrete WLANs can be created and mapped to the same or different APs or VLANs. In a centrally managed configuration, the ZoneFlex 2942 works with a wide range of authentication servers including Microsoft’s Active Directory, LDAP , and RADIUS.Flexible Deployment OptionsZoneFlex 2942 APs can be deployed in as a standalone AP or as part of a centrally managed wireless LAN using ZoneDirector Smart WLAN controllers. ZoneFlex 2942’s can be deployed across any L2/L3 network and/or meshed without Ethernet cabling. When used with the ZoneDirector, the ZoneFlex 2942 is automatically configured through the network making deployment quick and easy.Complete Local and Remote ManagementThe ZoneFlex 2942 can be managed as a standalone AP through a Web-based GUI, using SNMP or through theRuckus FlexMaster Wi-Fi remote management system. Localmanagement can also be performed using the ZoneDirector Smart WLAN controller. FlexMaster is a LINUX-based software platform that uses industry-standard protocols to per-form bulk configuration, fault detec-tion, monitoring and a wide range oftroubleshooting capabilities over a wire area connection. The ZoneDirector enables local management and controlof APs, adding value-added services such as transmit powerand channel management, guest networking and meshing.traffic types.*when used with Ruckus ZoneDirector controllerSpecificationsTARGET UDP THROUGHPUT • 15-20Mbps (54Mbps bursts)sustainable throughput for a 5000 sq. foot (460 sq meter) area SIMULTANEOUS Vo-Fi CLIENTS• Up to 20SUPPORTED DATA RATES • 54,48,36,24,18,12,11,9,6,5.5,2,1 Mbps CHANNELS• US/Canada: 1-11• Europe (ETSI X30): 1-13 • Japan X41: 1-13AUTO CHANNEL SELECTION • SupportedRF POWER OUTPUT• Max transmit power 24 dBm• Country-speciﬁc power settings are conﬁgurable TRANSMIT POWER CONTROL • Supported BSSID • Up to eight POWER SAVE • SupportedWIRELESS SECURITY• WEP , WPA-PSK, WPA-TKIP , WPA2 AES, 802.11i• Authentication via 802.1X with the ZoneDirector, local authentication database, support for RADIUS and ActiveDirectory CERTIFICATIONS• U.S., Europe, Australia, Brazil,Canada, Chile, Colombia, Ecuador, Egypt, Hong Kong, India, Indonesia, Korea, Malaysia, Mexico, New Zealand, Pakistan, Philippines, Singapore, South Africa, Taiwan, Thailand, UAE, Uruguay, Vietnam • WEEE/RoHS compliance • Wi-Fi alliance certification • EN 60601-1-2Ruckus Wireless, Inc.880 West Maude Avenue, Suite 101, Sunnyvale, CA 94085 USA(650) 265-4200 Ph \ (408) 738-2065 FxCopyright ©2011, Ruckus Wireless, Inc. All rights reserved. Ruckus Wireless and Ruckus Wireless design are registered in the U.S. Patent and Trademark Ofﬁce. Ruckus Wireless, the Ruckus Wireless logo, BeamFlex, ZoneFlex, MediaFlex, MetroFlex, FlexMaster, ZoneDirector,SpeedFlex, SmartCast, and Dynamic PSK are trademarks of Ruckus Wireless, Inc. in the United States and other countries. All other trademarks mentioned in this document or website are the property of their respective owners. 801-70654-001 rev 10w w w.r u c k u s w i r e l e s s.c o mPLEASE NOTE: When ordering you must specify the destinationregion by indicating -US, -EU, -AU, -BR, -IN, -KR, -PK, -SA, -UK, -UN, or -UU instead of XX.Product Ordering Information。

ANTENNAMAGUS

ANTENNAMAGUS1. IntroductionANTENNAMAGUS is a comprehensive antenna design and analysis software tool that simplifies and enhances the antenna design process. It provides engineers and researchers with a powerful platform to design, simulate, and optimize various types of antennas.2. Features2.1 Antenna DatabaseANTENNAMAGUS offers an extensive database that includes a wide range of antenna templates. This database covers different types of antennas, such as monopole, dipole, yagi, patch, horn, and many more. Each template comes with pre-defined parameters and can be customized.2.2 Design and SimulationThe software allows users to design and simulate antennas using various parameters. It offers a user-friendly interface that simplifies the design process. Users can input desired specifications, such as frequency, gain, polarization, and impedance, and the software will generate the antenna design accordingly.2.3 OptimizationANTENNAMAGUS provides optimization tools that help improve antenna performance. Users can set optimization objectives, such as maximizing gain or minimizing return loss, and the software will automatically search for the best configuration to achieve these objectives. This feature saves time and effort in manual tuning and testing.2.4 Analysis and VisualizationThe software includes analysis tools that enable users to analyze antenna performance. It provides graphs and visualizations of important parameters like radiation pattern, impedance, and bandwidth. These visualizations help engineers understand and evalu ate the antenna’s behavior.2.5 Integration with other softwareANTENNAMAGUS supports integration with other popular electromagnetic simulation tools. This allows users to import and export antenna designs between different software platforms, enhancing collaboration and flexibility in the antenna design workflow.3. Benefits3.1 Time-savingANTENNAMAGUS automates many steps in the antenna design process. With its vast database and optimization tools, engineers can quickly explore different design options, saving time compared to traditional manual design methods.3.2 Increased accuracyThe software’s simulation capabilities provide accurate predictions of an antenna’s performance. It takes into account various factors like environmental conditions, interference, and material properties, allowing for more precise design decisions.3.3 Cost-effectiveBy optimizing antenna performance, ANTENNAMAGUS helps reduce the need for physical prototypes and expensive field testing. This leads to cost savings in the product development cycle.3.4 Enhanced collaborationThe software’s integration capabilities enable seamless collaboration between different teams or designers using different software tools. It allows for easy sharing and exchange of antenna designs, promoting teamwork and efficiency.4. Use CasesANTENNAMAGUS can be used in various applications, including:4.1 Wireless Communication SystemsEngineers can use ANTENNAMAGUS to design and optimize antennas for wireless communication systems, such as Wi-Fi, Bluetooth, and cellular networks. The software helps ensure reliable signal transmission and reception, improving overall system performance.4.2 Satellite CommunicationThe software is also suitable for antenna design in satellite communication systems. Engineers can design and simulate antennas for tracking, telemetry, and control (TT&C) or communication with ground stations.4.3 Radar SystemsANTENNAMAGUS provides the tools necessary for antenna design in radar systems. Engineers can optimize antenna parameters to achieve desired radar performance, such as beam width, range, and accuracy.5. ConclusionANTENNAMAGUS is a powerful antenna design and analysis software tool that simplifies the design process and improves antenna performance. With its extensive database, optimization capabilities, and integration with other software tools, engineers can save time, enhance collaboration, and achieve accurate and cost-effective antenna designs. Whether for wireless communication, satellite communication, or radar systems, ANTENNAMAGUS provides the necessary tools for successful antenna design.。

手机1到5g发展中国英语作文

手机1到5g发展中国英语作文The Evolution of Mobile Phones: From 1G to 5GThe mobile phone industry has undergone a remarkable transformation over the past few decades. Starting from the basic first-generation (1G) analog systems, the technology has evolved rapidly, bringing about significant changes in the way we communicate and interact with the world around us. This essay will explore the development of mobile phones from 1G to the current fifth-generation (5G) technology, highlighting the key advancements and their impact on our lives.The 1G era, which emerged in the 1980s, marked the beginning of the mobile communication revolution. These early analog systems, such as the Advanced Mobile Phone System (AMPS) in the United States, provided users with basic voice calling capabilities. However, the limitations of 1G technology were evident, as the systems were prone to poor call quality, limited coverage, and low security. Despite these drawbacks, 1G phones paved the way for the development of more advanced digital cellular networks.The 1990s ushered in the second-generation (2G) digital mobile technology, such as the Global System for Mobile Communications (GSM) and the Code Division Multiple Access (CDMA) systems. These networks introduced several improvements, including better voice quality, increased capacity, and the ability to transmit data through text messaging and basic internet services. The introduction of digital encryption also enhanced the security of mobile communications. The widespread adoption of 2G networks laid the foundation for the rapid growth of the mobile phone industry, making these devices more accessible and affordable to the general public.As the demand for mobile data services continued to rise, the industry moved towards the third-generation (3G) technology in the early 2000s. 3G networks, such as the Universal Mobile Telecommunications System (UMTS) and CDMA2000, offered significantly faster data speeds, enabling users to access the internet, stream multimedia, and engage in video calling. The integration of features like GPS navigation and improved multimedia capabilities further enhanced the functionality of mobile phones. 3G technology paved the way for the development of smartphones, which combined the communication capabilities of traditional mobile phones with the computing power of personal digital assistants (PDAs).The fourth-generation (4G) mobile technology, introduced in the late 2000s, represented a major leap forward in terms of speed and efficiency. 4G networks, such as Long-Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX), offered download speeds up to 100 Mbps, significantly faster than their 3G counterparts. This increased bandwidth enabled users to enjoy high-quality video streaming, seamless web browsing, and real-time online gaming on their mobile devices. The development of 4G technology also paved the way for the widespread adoption of smartphones, which became indispensable tools for communication, entertainment, and productivity.The latest advancement in mobile technology is the fifth-generation (5G) network, which is currently being deployed in various parts of the world. 5G promises to revolutionize the way we interact with our devices and the world around us. With download speeds up to 10 Gbps, 5G networks offer unprecedented levels of speed, low latency, and increased capacity. This enables a wide range of new applications, including real-time remote healthcare, autonomous vehicles, and the Internet of Things (IoT), where everyday devices are connected and can communicate with each other seamlessly.One of the key features of 5G technology is its ability to support the growing demand for high-bandwidth applications, such as virtualreality (VR), augmented reality (AR), and 4K/8K video streaming. The low latency of 5G, typically less than 1 millisecond, also enables real-time interactions and critical applications that require instantaneous response times, such as remote surgery and industrial automation.Moreover, 5G networks are designed to be more energy-efficient and environmentally friendly compared to previous generations. The use of advanced antenna technologies and efficient spectrum utilization can significantly reduce the energy consumption of 5G base stations, contributing to a more sustainable mobile infrastructure.The development of 5G technology has also paved the way for the convergence of various industries, leading to the emergence of new business models and innovative services. For example, 5G-enabled smart cities can optimize urban infrastructure, improve traffic management, and enhance public safety through the integration of IoT devices and real-time data analysis.In the realm of healthcare, 5G technology can enable remote patient monitoring, telemedicine, and the use of advanced medical devices, improving access to healthcare services and enhancing patient outcomes. Similarly, in the manufacturing sector, 5G-powered industrial automation and robotics can boost productivity, quality, and safety in production processes.As the mobile industry continues to evolve, the transition from 1G to 5G has been marked by significant advancements in speed, capacity, and functionality. Each generation of mobile technology has brought about transformative changes, shaping the way we communicate, access information, and interact with the digital world.Looking ahead, the future of mobile technology holds even greater potential. With the ongoing development of 6G and beyond, we can expect further breakthroughs in areas such as holographic communication, brain-computer interfaces, and the seamless integration of mobile devices with our daily lives. As the mobile industry continues to push the boundaries of technology, it is clear that the evolution of mobile phones will continue to have a profound impact on our society, economy, and the way we live our lives.。

BASE STATION ANTENNA

专利名称：BASE STATION ANTENNA发明人：LIU, RUOPENG,JI, CHUNLIN,YUE, YUTAO,HONG, YUNNAN申请号：CN2011/084174申请日：20111217公开号：WO2013/029321A1公开日：20130307专利内容由知识产权出版社提供专利附图：摘要：The present invention relates to a base station antenna comprising an antenna module having multiple resonators arranged in an array and a metamaterial module arranged in correspondence to the resonators. The metamaterial module comprises atleast one metamaterial lamella. Areas on each metamaterial lamella directly opposite to each resonator form refractive index distribution areas. Each refractive index distribution area forms therein multiple refractive index straight lines parallel to each other. With one refractive index straight line within each refractive index distribution area as a dividing line, respectively formed on two sides of the dividing line is one square area. Points on a same refractive index straight line within each square area have identical refractive indexes. Each refractive index straight line decreases gradually along the direction away from the dividing line, while the rate of decrease increases gradually. This changes a transmission path of an electromagnetic wave emitted by the resonators, thus improving the directionality and gain thereof.申请人：KUANG-CHI INSTITUTE OF ADVANCED TECHNOLOGY,深圳光启高等理工研究院,KUANG-CHI INNOVATIVE TECHNOLOGY LTD.,深圳光启创新技术有限公司,LIU, Ruopeng,刘若鹏,JI, Chunlin,季春霖,YUE, Yutao,岳玉涛,HONG, Yunnan,洪运南地址：518057 CN,518057 CN,518034 CN,518034 CN,518057 CN,518057 CN,518057 CN,518057 CN,518057 CN,518057 CN,518057 CN,518057 CN国籍：CN,CN,CN,CN,CN,CN,CN,CN,CN,CN,CN,CN代理人：GUANGZHOU SCIHEAD PATENT AGENT CO., LTD,广州三环专利代理有限公司更多信息请下载全文后查看。