DELTALINK / RF
Far-Field Distance Calculator
Check the conventional Fraunhofer distance and the maximum aperture dimension for an available range.
Free. No registration. Values stay in your browser unless you choose to share a link.
The default chart spans center frequency ±7.5%: a visualization assumption, not a physical antenna bandwidth limit. Override it in Advanced settings.
Frequency comparison
Chart data and units
Engineering notes, formulas & examples
Formula and units
λ = c/f; R = 2D²/λ; Dmax = √(Ravailable λ/2)
D is the maximum relevant antenna dimension in metres, not necessarily only the reflector diameter. All range results are metres.
Worked example
At 5.8 GHz with a 0.6 m aperture, R is approximately 13.93 m. A 15 m distance meets this conventional criterion.
Assumptions and limitations
Meeting 2D²/λ alone does not qualify an antenna test range. Source antenna, illumination uniformity, reflections, quiet zone, alignment, polarization, dynamic range and other field-region criteria still matter.