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Antenna Factor Calculator

Formula

The formula to calculate the Antenna Factor (AF) is:

$AF = 20 \log_{10}\left(\frac{FS}{V}\right)$

Where:

$AF$ is the Antenna Factor (dB/m)
$FS$ is the Field Strength (V/m)
$V$ is the Voltage (V)

What is an Antenna Factor?

The antenna factor is a measure used in electromagnetic compatibility (EMC) testing to relate the electric field strength to the voltage induced by that field in an antenna. It is a critical parameter for determining the performance of an antenna in a given electromagnetic environment. The antenna factor is typically expressed in decibels per meter (dB/m) and is used to convert measurements taken by an antenna into field strength values.

Example Calculation

Let's assume the following values:

Field Strength (FS) = 10 V/m
Voltage (V) = 0.1 V

Using the formula:

$AF = 20 \log_{10}\left(\frac{10}{0.1}\right) = 20 \log_{10}(100) = 20 \times 2 = 40 \, \text{dB/m}$

The Antenna Factor is 40 dB/m.