Unguided media, also known as wireless media, transmit data through space without the use of wires or cables. This includes transmission via radio waves, microwaves, and infrared waves. Radio waves are used for WiFi, mobile phones, remote controls, television broadcasts, and more. Modulation involves varying properties of a signal, and can be analog, transferring signals like audio, or digital, transferring bit streams. Infrared waves are used for short-range communication like night vision cameras, remote controls, and file sharing between devices that require a direct line of sight.

1. Unguided Media
Name : Muhammad ZAhid Faiz

2. Unguided Media
Unguided Media

3. Unguided Media
Introduction
Transmission Media:
Any thing that carry information electronically from one location to an other location is called
transmission media.
It is Physical path between transmitter and receiver in a data communication system.
May be classified into two types:
1. Guided Media
2. Unguided Media
1. Guided Media
Waves are guided along a solid medium, such as twisted pair cable, coaxial cable or fiber optics cable.
2. Unguided Media
The type of communication media in which communication devices sends and receive data in the
form of signals through space.
 Radio Waves
 Microwaves
 Infrared

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Radio Waves
Radio waves are the part of the electromagnetic spectrum with the longest
wavelengths. Radio waves are used in radio and television broadcasts,
satellite transmissions and cell phone signals.
Uses of Radio Waves
1. Wi-Fi
2. Mobile telephone communication
3. Universal Remote controls (RC Cars)
4. Television Transmission
5. Wireless Keyboard and Mouse

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What is Modulation?
In electronics and telecommunications, modulation is the process of varying one or more properties
of a periodic waveform.
There are following two types of modulation:
1. Analog Modulation
2. Digital Modulation
1. Analog Modulation
Analog modulation is transfer an analog signal, for example an audio signal or TV signal.
2. Digital Modulation
Digital modulation is transfer a digital bit stream, for example over the public switched telephone network.

6. This may not be possible for long distance transmission
because signals become weaker and require power
amplification.
Repeater on antennas are mounted at very height towers
usually 20 to 30 miles.

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Infrared Waves
Infrared Waves
Frequencies in the range from 300 GHz to 400
THz are called infrared waves.
 Used for short-range communication
 Line-of-sight propagation mode is employed in all
applications of infrared waves.
 Example: Night Vision Camera, Remote control, File
sharing between two phones, Communication
between a PC and peripheral device,

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Infrared Transmission
Infrared Transmission
Infrared connectivity is an old wireless technology used
to connect two electronic devices. It uses a beam
of infrared light to transmit information and so requires
direct line of sight and operates only at close range.
Very common with remote control devices, but can also
be used for device-to-device transfers.
Infrared light is electromagnetic radiation with a
wavelength longer than that of visible light, measured from
the nominal edge of visible red light.