Wireless Transmission

WIRELESS TRANSMISSION

RANGES OF FREQUENCIES Microwave Frequencies  Radio Range  Infrared 

INTRODUCTION Antenna  Parabolic Antenna 

MICROWAVE FREQUENCIES  Directional

Terrestrial Microwave  Satellite Microwave 

TERRESTRIAL MICROWAVE 

Physical Description  Most

common type  3m in diameter  Fixed rigidly  Located at substantial heights 

Applications  Long-haul

telecommunications  Short point to point links  Cellular systems

SATELLITE MICROWAVE 

Physical Description A

microwave relay station  Links two or more ground based microwave  Transponders 

Applications  Television

distribution  Long-distance telephone transmission  Private business networks  Global positioning

SATELLITE MICROWAVE

RADIO RANGE 

Broadcast Radio  Application

FM radio  Televison 

 Physical 

description

Omnidirectional

INFRARED 

Uses transmitters/receivers (transceivers).

Does not penetrate walls.  No frequency allocation. 

WIRELESS PROPAGATION Ground Wave Propagation  Sky Wave Propagation  Line-of-Sight Propagation 

Frequency Bands

IMPAIRMENTS FOR LOS TRANSMISSION Free Space Loss  Atmospheric Absorption  Multipath  Refraction 