Radio refers to the electromagnetic waves propagating in all free space (including air and vacuum ) . It is one of the limited frequency bands. The upper limit frequency is 3THz (terahertz) and the lower limit frequency is not uniform. In various RF specifications, 3KHz is common. ~ 3THz ( ITU - International Telecommunication Union ), 9KHz ~ 3THz, 10KHz ~ 3THz


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