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Antenna Far-Field Distance

Estimate the common Fraunhofer far-field screening distance from maximum antenna dimension and frequency.

Inputs

Inputs

Range: 0.003280839895–3,280.839895 ft

Enter the largest physical dimension D of the antenna under test in feet, not the reflector radius or an unrelated installation dimension. The value is converted to meters for the formula.

Range: 1–300,000 MHz

Enter frequency in MHz (2.4 GHz = 2,400 MHz). Use the frequency at which the antenna is being evaluated.

Result

Far-field screening distance (ft)
210.119
Far-field screening distance (m)
64.044
Free-space wavelength (ft)
0.409821
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.