Electromagnetic radiation is the transfer of momentum and energy in the form of waves in space by electric and magnetic fields oscillating in the same direction and perpendicular to each other, with their propagation direction perpendicular to the plane composed of the electric and magnetic fields. The interaction between electric and magnetic fields generates electromagnetic waves, which are emitted or propagated into the air to form electromagnetic radiation.

Electromagnetic radiation is composed of electrical and magnetic energy transmitted through space, generated by the movement of electric charges. For example, the moving charges emitted by the RF antenna that emits signals will generate electromagnetic energy.

Electromagnetic compatibility (EMC)=electromagnetic emission（EMI）+Electromagnetic Immunity (EMS) consists of two parts.

The electromagnetic spectrum includes various types of electromagnetic radiation, fromExtremely low frequency electromagnetic radiationFrequency dependent electromagnetic radiation. There are radio waves, microwaves, infrared rays, visible light, and ultraviolet rays between the two.electromagnetic spectrumThe general definition of the mid radio frequency part refers to radiation with a frequency of approximately 300 to 300 gigahertz. Some electromagnetic radiation has a certain impact on the human body.