1, the basic concept
Electromagnetic disturbance propagation or coupling is usually divided into two categories: conduction disturbance propagation and radiation disturbance propagation. Electromagnetic disturbances transmitted through conductors are called conducted disturbances; electromagnetic disturbances transmitted through space are called radiated disturbances.
The model of the infectious disease in the above picture is very similar:
2. Common units of electromagnetic disturbance
The unit of harassment is expressed in general decibels, and the original definition of decibel is the ratio of two powers:
The unit of power is usually expressed in dBm, which is the value of power relative to 1mW:
The following derivation shows that the voltage is expressed in decibels (note that there is a precondition of R1=R2):
Usually dBuV is used to indicate the magnitude of the voltage, and dBuV is the value of the voltage relative to 1uV.
Radiation disturbance is usually measured by the magnitude of the electromagnetic field, and its unit is V/m. The commonly used unit is dBuV/m.
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