How is radio frequency radiation (RF) measured?
RF fields have electric and magnetic components. For example, the quantity of the electric field strength (usually represented by the symbol “E” and measured in “Volts per meter” – V/m) is used to measure the strength of the electric field. In addition, the quantity of the magnetic field strength (usually represented by the symbol “H” and measured in “Amperes per meter” – A/m) is used to express the strength of the magnetic field. Another quantity that is often used in higher frequencies (in the source’s far field) is power flux density, which is defined as power per surface unit. It is represented by the symbol “S”and measured in “Watts per square meter – W/m2 or milliwatts (one thousandth of a watt) per square centimeter – mW/cm2.
