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What is Antenna Factor ? | Antenna factor Definition

The figure depicts transmitting antenna and receiving antenna in a wireless communication chain. It is used as very useful parameter for EMC and EMI testing as it defines relation between E-field around antenna and voltage produced by it.

What is antenna factor

Antenna Factor definition: The ratio of incident electric field to generated voltage output from antenna is known as antenna factor. This is expressed in following antenna factor formula.

Antenna Factor Formula 1

Antenna factor can also be defined as ratio of magnetic field to received voltage. It can be expressed as follows.
AFMagnetic = Hincident/Vreceived

Power density of the wave (watts per unit area) in free space can be expressed as product of E and H field.
Hence we will have PFS = E * H = |E|2
η is intrinsic impedance of free space.

Power captured by antenna from free space can be expressed as follows.
Preceived = PFS * Ae
Where Ae is antenna aperture, which can be expressed as
Ae = ( λ2 * G )/ (4 * π)

At the antenna receiver, received power can be expressed as follows.
Pr = V2/Zload

From above, antenna factor can be expressed in different formula or equations as below.

Antenna Factor Formula 2 Antenna Factor Formula 3 Antenna Factor Formula 4

Following formula is used for antenna factor to gain conversion as well as for gain to antenna factor conversion.

Antenna Factor to Gain Formula

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