Use of Antenna Factors in EMI Measurements
There are various technical parameters associated with antennas which are commonly studied and defined; including gain, directivity, beamwidth (or beam area), aperture, antenna pattern, antenna temperature, and antenna radiation resistance. The antenna factor is rarely included as one of the basic parameters of an antenna, as it is used almost exclusively in EMI testing when making radiated electric field strength (E-field) measurements. E-field measurements are necessary for determining compliance with most electromagnetic interference requirements/standards, such as FCC Part 15, CISPR 22, EN 55022, etc. Many engineers starting new in the EMC field may find the concept of antenna factor and its explanation useful.
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