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Radio (electromagnetic wave in free space propagation)

2015-01-12 21:28:26

Radio refers to all the free space (air or vacuum) for the propagation of electromagnetic waves, which is a limited frequency band, the upper limit frequency in 300GHz (Gichz), the lower limit frequency is not unified, in a variety of RF specifications, common 3KHz~300GHz (specified in ITU international electric letter alliance), 9KHz~300GHz, 10KHz~300GHz.

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