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Antenna Effective Aperture

Calculate the receiving effective area implied by antenna gain at a selected frequency, in square meters and square feet.

Inputs

Inputs

Range: -20–80 dBi

Enter antenna gain in dBi at this frequency, referenced to an isotropic radiator. If a datasheet gives linear gain, convert it to dBi first. Do not substitute directivity or realized gain unless that is the quantity you intend to use.

Range: 1–300,000 MHz

Enter frequency in MHz (for example, 2.4 GHz = 2,400 MHz). Use the gain value specified for this frequency.

Result

Effective aperture (ft²)
1.336531
Effective aperture (m²)
0.124168
Linear gain (ratio)
100.0000
Free-space wavelength (m)
0.124914

Formula

Calculation logic

Formula definitions and substituted values.

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Screening tool. Verify the result against the manufacturer's published rating, the actual equipment, route, floor, and applicable local requirements before ordering, installing, or relying on it.