A frequency band is an interval in the frequency domain, delimited by a lower frequency and an upper frequency.
The frequency range of a system is the range over which it is considered to provide a useful level of signal with acceptable distortion characteristics.
A listing of the upper and lower limits of frequency limits for a system is not useful without a criterion for what the range represent.
The hertz is equivalent to cycles per second. The hertz (symbol Hz) is the unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
Frequency
|
Range
|
Uses
|
VLF
(Very Low Frequency)
|
Below
30 KHz
|
Radio
location equipment
|
LF
(Low Frequency)
|
30
to 300 KHz
|
Radio
navigation
|
MF
(Medium Frequency)
|
300KHz
to 3 MHz
|
AM
Radio broadcast
|
HF
(High Frequency)
|
3
MHz to 30 MHz
|
Radio
|
VHF
(Very High Frequency)
|
30
MHz to 300 MHz
|
FM
broadcast and TV VHF channels
|
UHF
(Ultra High Frequency)
|
300
MHz to 3 GHz
|
TV
UHF channels and cellular phone
|
SHF
(Super High Frequency)
|
3
GHz to 300 GHz
|
Satellite
communication
|
EHF
(Extremely High Frequency)
|
30
GHz to 300 GHz
|
Satellite
communication
|
It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
(10)3 Hz = KHz (Kilohertz)
(10)6 Hz = MHz (Megahertz)
(10)9 Hz = GHz (Gigahertz)
