What Are Radiated Emissions?

Radiated Emissions is a term for electric, magnetic, and electromagnetic fields radiated from electric circuit conductors.  Radiation is a natural consequence of radio frequency current and voltage flowing on conductors.  In this sense the conductors can be thought of as antennas.

For the purposes of EMI analysis, radiated emissions are generally of interest over the frequency range 10 kHz to 18 GHz, with most regulatory agencies limiting radiated emissions in the frequency range 2 MHz to 1 GHz.  RE Analyst allows radiated emissions over any frequency range to be evaluated.

Note:  At frequencies for which the radiated emissions model conductor length is large compared to wavelength (l = 1 / frequency) RE Analyst computation time increases.  At very high frequencies for which the conductor length is very large compared to wavelength RE Analyst computation time may be prohibitive.  Of course, a PC having higher computation speed and more RAM will decrease computation time.

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Radiated Emissions Limits