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In this second chapter, we talk about Frequency Bands. First of all, we explain what they are and the importance of their regulation. After that, we show a scheme of radio spectrum, with examples of different case uses. Finally, we talk about satellite frequency bands and some applications.
1) What are Frequency Bands?
Frequency bands are ranges of frequencies in the electromagnetic spectrum assigned to different uses within radio communications. Its use is regulated by the International Telecommunications Union (ITU) and may vary by location.
To prevent interference between different users, the generation and transmission of radio waves is strictly regulated by national laws, coordinated by ITU.
2) Radio Spectrum
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 30 Hz to 300 GHz or 1 THz. Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication.
Different parts of the radio spectrum are assigned by the ITU to different radio transmission technologies and applications. Ranges of allocated frequencies are often referred to by their provisioned use (for example, cellular spectrum or television spectrum). The frequency boundaries of the radio spectrum are a matter of convention in physics and are somewhat arbitrary. Due to it is a fixed resource which is in demand by an increasing number of users, the radio spectrum has become increasingly congested in recent decades, and the need to use it more effectively is driving modern telecommunications innovations such as spread spectrum, ultra-wideband or frequency reuse.
The lowest frequencies used for radio communication are limited by the increasing size of transmitting antennas required. The highest frequencies useful for radio communication are limited by the absorption of microwave energy by the atmosphere.
As a matter of convention, the ITU divides the radio spectrum into several bands with traditional names. For example, the medium frequency band (MF) corresponds with a frequency range of 300 kHz to 3 MHz. In the image you can see some of the main uses of each band.
3) Satellite Frequency Bands
Satellite technology is developing fast, and the applications for satellite technology are increasing all the time. Not only can satellites be used for radio communications, but they are also used for astronomy, weather forecasting, broadcasting and many more applications.
Because of the variety of satellite frequency bands that can be used, some designations have been developed:
We hope you enjoy it and learn something new 🙂