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Immunity
1. The property of a receiver or any other equipment or system enabling it to reject a
radio disturbance.
2. The ability of electronic equipment to withstand radiated electromagnetic fields
without producing undesirable responses.
Intermodulation
Mixing of two or more signals in a nonlinear element, producing signals at
frequencies equal to the sums and differences of integral multiples of the original
signals.
Isotropic
Isotropic means having properties of equal values in all directions.
Mono pol
An antenna consisting of a straight conductor, usually not more than one-quarter
wave length long, mounted immediately above, and normal to, a ground plane. It is
connected to a transmission line at its base and behaves, with its image, like a dipole.
Narrowband emissions
That which has its principal spectral energy lying within the bandpass of the
measuring receiver in use.
Open area
A site for radiated electromagnetic interference measurements which is open flat
terrain at a distance far enough away from buildings, electric lines, fences, trees,
underground cables, and pipe lines so that effects due to such are negligible. This site
should have a sufficiently low level of ambient interference to permit testing to the
required limits.
Polarization
A term used to describe the orientation of the field vector of a radiated field.
Radiated interference
Radio interference resulting from radiated noise of unwanted signals. Compare radio
frequency interference below.
Radiation
The emission of energy in the form of electromagnetic waves.
Radio frequency interference
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