Dynamics: How to Use Volume in Your Piano Playing
 
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In the study of diffraction and antenna design, the near field is that part of the radiated field that is below distances shorter than the Fraunhofer distance. The near field and far field are regions of the electromagnetic field (EM) around an object, such as a transmitting antenna, or the result of radiation scattering off an object. Non-radiative near-field behaviors dominate close to the antenna or scattering object, while electromagnetic radiation far-field behaviors dominate at greater distances.

This calculator calculates the reactive near field distance, radiating near field distance (Fresnel region) and the far field distance. Just enter the frequency of operation and the dimension of the antenna.