||It has been suggested that portions of Antenna effective length be moved or incorporated into this article. (Discuss)|
|Part of a series on|
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:
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:
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 (376.7Ω) and the load as 50Ω. The antenna effective aperture can be written as A = (λ2G)/4π.
- Interpreting Antenna Performance Parameters for EMC Applications
- Interpreting Antenna Performance Parameters for EMC Applications[dead link] An excellent page with summaries of all the relevant equations
- Antenna Theory