ICT 305
Data Com m u nication
System s and Netw or k
By
Dr. B . K . Nu h u
,Wireless Transmission
• Transmission and reception is via
antennas
• For transmission, the antenna radiates
electromagnetic energy into the medium
(usually air), and for reception, the
antenna picks up electromagnetic waves
from the surrounding medium.
• There are basically two types of
configurations for wireless transmission:
directional and Omni-directional
, • For the directional configuration, the
transmitting antenna puts out a focused
electromagnetic beam; the transmitting and
receiving antennas must therefore be
carefully aligned.
• In the omnidirectional case, the transmitted
signal spreads out in all directions and can be
received by many antennas.
• the higher the frequency of a signal, the more
it is possible to focus it into a directional
beam
Data Com m u nication
System s and Netw or k
By
Dr. B . K . Nu h u
,Wireless Transmission
• Transmission and reception is via
antennas
• For transmission, the antenna radiates
electromagnetic energy into the medium
(usually air), and for reception, the
antenna picks up electromagnetic waves
from the surrounding medium.
• There are basically two types of
configurations for wireless transmission:
directional and Omni-directional
, • For the directional configuration, the
transmitting antenna puts out a focused
electromagnetic beam; the transmitting and
receiving antennas must therefore be
carefully aligned.
• In the omnidirectional case, the transmitted
signal spreads out in all directions and can be
received by many antennas.
• the higher the frequency of a signal, the more
it is possible to focus it into a directional
beam
