TAILIEUCHUNG - Lò vi sóng RF và hệ thống không dây P8

Wireless Communication Systems The RF and microwave wireless communication systems include radiolinks, troposcatter=diffraction, satellite systems, cellular=cordless=personal communication systems (PCSs)=personal communication networks (PCNs), and wireless localarea networks (WLANs). The microwave line-of-sight (LOS) point-to-point radiolinks were widely used during and after World War II. The LOS means the signals travel in a straight line. The LOS link (or hop) typically covers a range up to 40 miles | RF and Microwave Wireless Systems. Kai Chang Copyright 2000 John Wiley Sons Inc. ISBNs 0-471-35199-7 Hardback 0-471-22432-4 Electronic CHAPTER EIGHT Wireless Communication Systems INTRODUCTION The RF and microwave wireless communication systems include radiolinks tropo-scatter diffraction satellite systems cellular cordless personal communication systems PCSs personal communication networks PCNs and wireless localarea networks WLANs . The microwave line-of-sight LOS point-to-point radiolinks were widely used during and after World War II. The LOS means the signals travel in a straight line. The LOS link or hop typically covers a range up to 40 miles. About 100 LOS links can cover the whole United States and provide transcontinental broadband communication service. The troposcatter scattering and diffraction from troposphere can extend the microwave LOS link to several hundred miles. After the late 1960s geostationary satellites played an important role in telecommunications by extending the range dramatically. A satellite can link two points on earth separated by 8000 miles about a third of the way around the earth . Three such satellites can provide services covering all major population centers in the world. The satellite uses a broadband system that can simultaneously support thousands of telephone channels hundreds of TV channels and many data links. After the mid-1980s cellular and cordless phones became popular. Wireless personal and cellular communications have enjoyed the fastest growth rate in the telecommunications industry. Many satellite systems are being deployed for wireless personal voice and data communications from any part of the earth to another using a hand-held telephone or laptop computer. 243 244 WIRELESS COMMUNICATION SYSTEMS FRIIS TRANSMISSION EQUATION Consider the simplified wireless communication system shown in Fig. . A transmitter with an output power Pt is fed into a transmitting antenna with a gain Gt. The signal is picked

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• Lò vi sóng RF
• hệ thống không dây
• truyền thông không gian
• hệ thống sóng RF
• mạch lò vi sóng
• Bộ lọc Microstrip
• ứng dụng lò vi sóng
• ứng dụng Microstrip
• sóng viba
• Mạch RF
• lò vi sóng
• mạch lạc lò vi sóng
• tín hiệu điện