In telecommunications, the antenna factor is defined as the ratio of the incident electromagnetic field strength to the voltage V on the line connection of an antenna.

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  • In telecommunications, the antenna factor is defined as the ratio of the incident electromagnetic field strength to the voltage V on the line connection of an antenna. For an electric field antenna, the field strength is in units of V/m or µV/m and the resulting antenna factor AF is in units of 1/m: AF = \frac EV If all quantities are expressed logarithmically in decibels instead of SI units, the above equation becomes AF_{\mathrm{dBm}^{-1}} = E_\mathrm{\mathrm{dBV/m}} - V_{\mathrm{dBV}} = E_\mathrm{\mathrm{dB}\mu\mathrm{V/m}} - V_{\mathrm{dB}\mu\mathrm{V}} For a magnetic field antenna, the field strength is in units of A/m and the resulting antenna factor is in units of A/(Vm). For the relationship between the electric and magnetic fields, see the impedance of free space. In a 50 Ω system, the antenna factor is related to the antenna gain G and the wavelength λ via: AF = \frac{9.73}{\lambda \sqrt{G} } The variable G means antenna gain (dimensionless) and it can be written in terms of effective aperture A to obtain the final expression considering the impedance of free space (376.6Ω) and the load as 50Ω. The antenna effective aperture can be written as A = (λG)/4π.
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  • In telecommunications, the antenna factor is defined as the ratio of the incident electromagnetic field strength to the voltage V on the line connection of an antenna.
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  • Antenna factor
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