This presentation provides an overview of radio communication. It discusses the history of radio from Maxwell's electromagnetic theory to modern innovations. It then covers key topics like classification of radio waves, modulation techniques, transmitter and receiver components, common uses, and future technologies like cognitive radio networks. The presentation aims to explain the basic mechanisms and applications of radio communication over the last hundred years.

1. AMERICAN INTERNATIONAL UNIVERSITY-
BANGLADESH
E-shop Presentation

2. RADIO
COMMUNICATION
Presented By:
Name ID
Abdullah Al Mamun 17-33127-
1
Fayed Al Hasan 17-
33184-1
Asim Chandra Das 17-34321-
1
Niloy Sarker 17-
33240-1
Rashedur Rahman Rashed 17-33589-1

3. WELC
OME

4. CONTENT:
 Introduction
 History
 Classification of Radio Waves
 Mechanism
 Modulation
 Carrier Frequencies
 Transmitter & Receiver
 Uses of Radio Waves
 Advantages & Disadvantages
 Future Technology for Radio
Communication
 Conclusion

5. INTRODUCTI
ON
 Radio is the radiation of
electromagnetic signals through the
atmosphere or free space.
 The transmission and reception of
electromagnetic waves of radio
frequency, especially those carrying
sound messages.

6. HISTORY
 In 1873 James Clerk Maxwell showed mathematically that electromagnetic waves
could propagate through free space.
 The first intentional transmission of a signal by means of electromagnetic waves
was performed in an experiment by David Edward Hughes around 1880.
 In 1888 Heinrich Roudolf Hertz was able to prove transmitted electromagnetic
waves in an experiment confirming Maxwell’s theory of electromagnetism.
James Clerk Maxwell David Edward Hughes Heinrich Roudolf Hertz

7.  Nikola Telsa experimentally demonstrated the transmission and radiation of radio
frequency energy in 1892.
 In 1895, Marconi built a wireless system capable of transmitting signals at long
distances(1.5 mi./ 2.4 km).
 From Marconi’s experiments, the phenomenon that transmission range is
proportional to the square of antenna height is known as “Macroni’s Law”.
Guglielmo Marconi

8. CLASSIFICATION OF RADIO
WAVES
Names of radio waves Frequency Wave length
 VLF(Very Low Frequency) 3kHz ~ 30kHz 100km ~ 10km
 LF(Low Frequency) 30kHz ~ 300kHz 10km ~ 1km
 MF(Medium Frequency) 300kHz ~ 3MHz 1km ~ 100m
 HF(High Frequency) 3MHz ~ 30MHz 100m ~ 10m
 VHF(Very High Frequency) 30MHz ~ 300MHz 10m ~ 1m
 UHF(Ultra High Frequency) 300MHz ~ 3GHz 1m ~ 10cm
 SHF(Super High Frequency) 3GHz ~ 30GHz 10cm ~ 1cm
 EHF(Extremely High Frequency) 30GHz ~ 300GHz 1cm ~ 1mm

9. MECHANISM

10. MODULATION
Amplitude Modulation

11. Frequency Modulation

12. CARRIER FREQUENCIES
 A Carrier Frequency is modulated with an input signal for the purpose of
conveying information.
 Modulating Frequency: Frequency modulation is the encoding of information in a
carrier wave by varying the instantaneous frequency of the wave.
 IF Frequency (Intermediate Frequency): An intermediate frequency is a frequency
to which a carrier wave is shifted as an intermediate step in transmission or
reception.
 IF Amplifier (Intermediate-Frequency Amplifier): Intermediate-Frequency
Amplifiers are amplifier stages used to raise signal levels in radio and television
receivers, at frequencies intermediate to the higher radio-frequency signal from
the antenna and the lower audio or video frequency that the receiver is
recovering.

14. RADIO TRANSMITTER

15. RADIO RECEIVER

16. USES OF RADIO
WAVES
Here are some common uses:
Wireless technology
Mobile telephone communication
Television
Radar
Radio wave in space
Wi-Fi
Bluetooth
And so many.

17. ADVANTAGES
 Fast
 Covers long distance
 Secure capabilities
 Send the message to large
amounts of people at once
 Cheap
 Low energy cost
 Low noise background
And so many.

18. DISADVANTAGES
 Limited number of free frequency
band
 Shielding is difficult
 Interference with other electrical
devices
 Greater power consumption
 Limited spectrum of frequency
 Requires a power supply
 Only voice signal can be
transmitted

19. FUTURE
TECHNOLOGY FOR
RADIO
COMMUNICATION
Cognitive Radio Network
 Cognitive radio have the ability to
monitor sense and detect the
conditions of their operating
environment.
 A Cognitive Radio is an intelligent
radio that can be programmed and
configured dynamically. Its
transceiver is designed to use the best
wireless channels.

20. CONCLUSION
 The radio communication has been used
over a hundred years now. Now we can
easily connect, communicate and share
faster. It has made us to communicate
very long distance easily and cheaper.
 The uses of radio communication is
increasing day by day and its being used
by a wide range of electrical sector.
 The technology is upgrading to give us
better satisfaction.

21. THE
END

22. ANY
QUESTION
???