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What is Radio Frequency 2024-05-15

What is Radio Frequency.


Estimated 5minutes to finish reading

A variable current (alternating current) is generated from a radio frequency transmitter, transmitted to an antenna through a copper wire, and radiated in the form of an electromagnetic wave, which is radio frequency Radio frequency is abbreviated as RF, which is short for high-frequency electromagnetic waves, and can also be referred to as radio waves

Relationship between Wifi and RF

The frequency band of RF is 3Hz to 300GHz

The Wifi/wireless signals we use belong to a type of radio frequency, which operates in the 2 .4G and 5GHz frequency bands.


Range of 2.4GHZ ~ 2.4835GHZ, each channel occupies 20M, the 2.4G is divided into 13 channels (the world divided into 14 channels, China is only 13 channels); the distance between the center frequency of each channel is 5MHz of which 1, 6, 11 channels are completely non-overlapping channels. Bluetooth, microwave ovens, cordless phones also work in the 2.4GHz, generally cause interference to the wireless signal.


There are two main ranges: 5.15GHz-5.35GHz and 5.725-5.85GHz.

China's 5GHz is also divided into only 13 channels, and all of them do not overlap each other.

RF and frequency band

When we use the device will generally say that this device supports dual dual-band, single dual-band, dual tri-band, etc., what do these mean?

Multi-channel refers to how many radio frequency cards

Multi-frequency means how many frequency bands are supported, generally speaking, all the way to support only one frequency, but now we can adjust the algorithm to make a road to support multiple frequencies Dual dual-frequency: two RF cards, one 2.4GHz, one 5GHz

Single dual-frequency: one RF card through the software to achieve 2.4GHz and 5GHz switching

Dual tri-band: two RF cards, one 2.4GHz, one 5GHz: 5GHz can be realized through the software 5GHz switching between high frequency and low frequency


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