lvzb7@chinaunicom.cn MIMO. In the indoor scenarios‚ higher data rate is required normally. It is necessary to utilize MIMO technique to provide high peak rate. For the traditional 2G/3G distributed antenna systems with single-path single-polarized antenna‚ it is required to upgrade to multiple antennas. Abstract—With the development of Internet and 3G communication systems‚ the requirement of data transmission is increasing. Multi-Input-Multi-Output (MIMO) as one of the important techniques
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Microwave Transmission Basics Microwave Transmission Basics Table of Contents • MW Advantages • MW Frequency bands • MW Link elements • Antenna Radiation Pattern • MW Alarms Microwave Transmission Basics Features Advantages Rapid Deployment – A microwave link can be installed in as little as one day No right-of-way issues – Radio spans all obstacles such as roads‚ railways‚ etc.‚ avoiding any requirement to seek permissions that inevitably are costly and introduce time delays
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Fundamental Dimension Limits of Antennas Ensuring Proper Antenna Dimensions in Mobile Device Designs Randy Bancroft Centurion Wireless Technologies Westminster‚ Colorado Abstract–The electronics industry has historically decreased the physical dimensions of their product offerings. In the age of wireless products this drive to miniaturize continues. Antennas are critical devices that enable wireless products. Unfortunately‚ system designers often choose antenna dimensions in an ad hoc manner.
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Multiple-Input Multiple-Output Wireless Communication Systems Using Antenna Pattern Diversity Liang Dong‚ Hao Ling‚ and Robert W. Heath‚ Jr. Department of Electrical and Computer Engineering The University of Texas‚ Austin‚ TX 78712 Abstract— Multiple-input multiple-output (MIMO) wireless communication systems employ multiple transmit and multiple receive antennas to obtain significant improvement in channel capacity. However‚ the capacity is limited by the correlation of subchannels in non-ideal
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Electrical & Electronics Engineering LAB REPORT- III Reciprocity Theorem of Antenna (Tx and Rx pattern is same) By: Sudip Shrestha (41020) To: Manya Gautam Nov 21‚ 2010 Theory: 1. Reciprocity theorem: Many antenna properties are the same for both transmitting and receiving. It is often easier to calculate the gain of a transmitting antenna than the collecting area of a receiving antenna‚ and it is often easier to measure the receiving power pattern than to measure the transmitting
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successful completion of phase1 and phase2‚ both systems will be incorporated in a single unit to build an efficient and powerful charger. 2 Chapter 2 Background This project is based on a very simple concept‚ capture RF energy using an antenna‚ input it into a RF Transformer and use this energy to power
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__________________________________________ Mission We achieve customer satisfaction through service excellence and operational responsiveness. To provide network access and telecommunication services. To advance the quality of life by delivering the best solution to the communications based needs of our subscribing publics. SID is a customer-motivated organization; always striving to deliver innovative solution to extend the boundaries of communication at the sea‚ on land and in the air. SID’s
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derivation of the Friis Equation‚ consider two antennas in free space (no obstructions nearby) separated by a distance R: Figure 1. Transmit (Tx) and Receive (Rx) Antennas separated by R. Assume that Watts of total power are delivered to the transmit antenna. For the moment‚ assume that the transmit antenna is omnidirectional‚ lossless‚ and that the receive antenna is in the far field of the transmit antenna. Then the power density p (in Watts per square
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Primer Christophe Granet and Graeme L. James CSIRO ICT Centre‚ Electromagnetics & Antennas PO Box 76‚ Epping 1710‚ NSW‚ Australia E-mail: Christophe.Granet@csiro.au Keywords: Corrugated horn antennas; antenna feeds; reflector antenna feeds Slots 1. Introduction 0 ver the past 40 years‚ corrugated horns supporting so-called hybrid modes have become well established as feeds for reflector antennas‚ and even as direct radiators. It is not difficult to trace the popularity of the corrugated
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Automated Landing System (TALS) is so important to the Shadow 200 Tactical Unmanned Aircraft System Aerial Vehicle (TUAS AV). The TALS is made up of 4 key components: The Track Control Unit (TCU)‚ the Interrogator unit‚ Track Subsystem (TS)/radome antenna‚ and the pedestal. The Track Control Unit (TCU) is an all-weather‚ convection cooled unit. Its primary function is to provide power and control for the other Track Subsystem hardware. The TCU also includes computing resources and flight data storage
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