Unguided Media Unguided media is also known as wireless communication. It does not require any physical medium to transmit any electromagnetic signals. Medium media transmits electromagnetic signals through the air to all. These signals are available to anyone who has a device capable of receiving those signals. Signals go from transmitter to beneficiary by means of a way. this path called the media can be guided media or unguided media. A guided media is contained within physical boundaries, while an unguided media is boundless. It is also known as unbounded media and does not have any specific limits. All this allows the user to stay connected at all times. Because the communication done by it is wireless, the user can connect himself anywhere on the network. It is also classified into three radio waves, microwave, and infrared waves.

1. Unguided Media in
Computer Network|
Advantages and
Disadvantages |Edifyclue.in

2. You are going to read about Unguided media in this blog we cover all these
topics-Radio transmissions, Microwave transmission.
Contents
● Unguided Media
○ Radiofrequency transmission- Unguided media
■ INFRARED TRANSMISSION
■ MICROWAVE TRANSMISSION
■ SATELLITE MICROWAVE
Unguided Media
Unguided media is also known as wireless communication. It does not require
any physical medium to transmit any electromagnetic signals.
Medium media transmits electromagnetic signals through the air to all. These
signals are available to anyone who has a device capable of receiving those
signals.
● Signals go from transmitter to beneficiary by means of a way. this
path called the media can be guided media or unguided media.
● A guided media is contained within physical boundaries, while an
unguided media is boundless.
It is also known as unbounded media and does not have any specific limits. All
this allows the user to stay connected at all times.

3. Because the communication done by it is wireless, due to which the user can
connect himself anywhere on the network. It is also classified into three radio
waves, microwave, and infrared waves.
Radiofrequency transmission-
Unguided media
Radiofrequency transmission is a form of electromagnetic transmission that is
used in wireless communication.
RF signals can be easily generated, often in the range of 3kHz to 300GHz.
They are used in wireless communication because their special feature is that
they can easily penetrate into objects and together they can travel long
distances as well.
Radio communication depends on some parameters which are wavelength,
transmitter power, receiver quality, type, and size iN antenna height.
Drawbacks
● are frequency-dependent.
● They have relatively low bandwidth for data transmission.
INFRARED TRANSMISSION
The frequency of Infrared waves is about 300 GHz to 430 THz, which may be
used for short-range communication.

4. Infrared waves of high frequencies cannot penetrate walls. This characteristic
of Infrared waves prevents interference between one system and another.
This means a short-range communication system in a room cannot be affected
by another system in the adjacent room.
If we are using the infrared remote control, we do not interfere with the use of
the remote by our neighbors.
However, by this characteristic infrared signals become useless for long-range
communication.
Also, we cannot use infrared waves outside a building because the sun’s rays
contain infrared waves that can interfere with communication
Characteristics of infrared waves
● This sort of wide bandwidth is often wont to transmit digital data
at a really high rate. The Infrared Data Association (IrDA) has
established standards for using these signals for communication
between devices like keyboards, mice, PCs, and printers, and it’s
also liable for sponsoring the utilization of infrared waves.
● This type of communication provides better security with
minimum interference.
MICROWAVE TRANSMISSION
Microwave Transmission Microwaves are a form of electromagnetic
transmission that is used in wireless communication systems.
The microwave wavelength falls from one meter to one millimeter. The
frequency varies from 300MHz to 300GHz.

5. They are mainly used for long-distance communications and are much less
expensive.
Microwave
● unidirectional
● propagation is a line of sight
● repeaters are needed for long-distance communication
● very high-frequency microwaves cannot penetrate walls
The microwave consists of two types.
● Terrestrial microwave.
● satellite microwave
Drawbacks
● They cannot pass through microwave buildings.
● Bad weather has an effect on signal transmission. 3. They are
frequency-dependent.
TERRESTRIAL MICROWAVE
● Terrestrial microwave transmissions are sent between two
microwave stations on the earth (earth station).
● It is the most common form of long-distance communication.
● Terrestrial microwave systems operate in the low gigahertz
range.
● Use a parabolic dish to focus a narrow beam onto a receiver
antenna.

6. TERRESTRIAL CHARACTERISTICS
● fewer repeater but requires a line of sight transmission.
● higher frequencies give a higher data rate.
● the main source of loss in attenuation is caused mostly by
distance, rainfall, and interference.

7. SATELLITE MICROWAVE
● A communication satellite is a microwave relay station
● used to link two or more ground station
● receives on one frequency (uplink), amplifies, or repeats signal
and transmits on another frequency (downlink).

8. SATELLITE CHARACTERISTICS
● The optimum frequency range for satellite transmission is 1 to 10
GHz.
● satellites use a frequency bandwidth range of 5.925 to 6.425 GHz
from earth to the satellite (uplink) and a range of 3.7 to 4.2 GHz
from satellite to earth (downlink).
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different topics you can read also, like Guided media and Transmission modes
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Also Read: Guided Media in Computer Network