Radio frequency refers to electromagnetic waves that can be transmitted and propagated. Radio Frequency is referred to as RF radio frequency. An alternating current that changes less than 1,000 times per second is called a low-frequency current, and a frequency greater than 10,000 times is called a high-frequency current, and radio frequency is such a high-frequency current. Medically, the AC high-frequency current with a frequency of 0.5MHz--8MHz is called a radio frequency wave.