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Unguided media uses electromagnetic waves for wireless communication without a physical conductor. Wireless signals can travel through ground, sky or line-of-sight propagation and use different parts of the electromagnetic spectrum. The document discusses radio waves, microwaves and infrared signals as types of wireless transmission waves.

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63 views5 pages

Presentation1.pdf Extract 1

Unguided media uses electromagnetic waves for wireless communication without a physical conductor. Wireless signals can travel through ground, sky or line-of-sight propagation and use different parts of the electromagnetic spectrum. The document discusses radio waves, microwaves and infrared signals as types of wireless transmission waves.

Uploaded by

sameernsn
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We take content rights seriously. If you suspect this is your content, claim it here.
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Unguided Media: Wireless

• Unguided media transport electromagnetic waves without using a physical


conductor.
• This type of communication is often referred to as wireless communication.
• Signals are normally broadcast through free space and thus are available to
anyone who has a device capable of receiving them.
• Electromagnetic spectrum, ranging from 3 kHz to 900 THz, used for wireless
communication.
• Unguided signals can travel from the source to destination in several ways:
ground propagation, sky propagation, and line-of-sight propagation.
Propagation Methods of Wireless Transmission
Types Of Wireless Transmission Waves

• Radio waves are used for multicast communications, such as radio and
television, and paging systems. They can penetrate through walls. Highly
regulated. Use omni directional antennas.
• Microwaves are used for unicast communication such as cellular
telephones, satellite networks, and wireless LANs. Higher frequency
ranges cannot penetrate walls. Use directional antennas - point to point
line of sight communications.
• Infrared signals can be used for short-range communication in a closed
area using line-of-sight propagation.
Bands of Wireless transmission Propagation
Types of Antenna for Wireless Transmission

• Omnidirectional Antenna: Radio waves use omnidirectional


antennas that send out signals in all directions..
• Unidirectional Antenna: Microwaves need unidirectional
antennas that send out signals in one direction. Two types of
antennas are used for microwave communications: the
parabolic dish and the horn.

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