How many different frequency bands are there?

The textbook definition of a frequency band is an interval in the frequency domain, delimited by a lower frequency and upper frequency . The International Telecommunication Union has assigned designations to these intervals. … The Super Low Frequency (SLF) band is also suitable for submarine communication.

Pursuant to convention, the ITU divides the radio spectrum into 12 bands (as shown in the table below), each beginning at a wavelength which is a power of ten (10n) metres, with corresponding frequency of 3×108−n hertz, and each covering a decade of frequency or wavelength. Each of these bands has a traditional name.

The S-band as defined by IEEE is a frequency range from 2 to 4 GHz . IEEE uses letters to signify a range of frequencies from 1 to 170 GHz.