Yes.  All the information you need is in the far field.  The problem with the near field is that all of this information is obscured (but still there) because it is all overlapping and comingled with the reactive field of the antenna.  In the far field, you see only radiated waves and they have separated from each other.

Dear, Asghar.

Yes, that is true.

With my best regards.

@Raymond Rumpf if I measure an antenna in controlled environment and based on the data I collect from measuring equipment considering spherical coordinate system, if I calculate radiation pattern, directivity, gain etc will that means the values I get for these parameters are relative not actual? as there should be some distance between source and test antenna for far field condition.

Near fields region is reactive (i.e, reactive fields). We know that reactive part always tries to store the energy than releasing/dissipating. Hence far fields are taken into account in patterns measurements i.e., >2D2/Lambda . Where D is the larger dimension of antenna under test (AUT).

Yes, it's true. In Near-field region, the EM energy is confined around the antenna in the form of magnetic field. Also. the field components are not transverse. No propagation takes place.

@Muhammed -- Your measurements will be actual, but if you are too close you may not get a good measurement of the far field pattern.  To end up with relative measurements, you will have to do that with calculations.  Also, if you are able to obtain vector pattern measurements in the near-field, you can convert those measurements to far-field data through a process called near-field to far-field transformation.  This involves several steps: (1) Measure the vector near-field around your antenna over some closed surface, (2) calculate an equivalent current over that closed surface that would produce the same vector field, (3) Calculate the far-field from this surface current.

In near field the EM energy is restricted to particular area around the antenna and less propogation takes place but in far field there is no restricted area as well as it will meet the condition of 2xD(sq.)/Lambda.

The radiation pattern can be measured either in the far-field or the near-field.  If you measure in the far-field the variation of power with angle does not change significantly no matter what distance you measure at.  If you measure at less than 2D^2/lambda then the pattern changes with range but is still not in the reactive field until at sub-wavelength distance from the antenna.  Measurements in the propagating near-field using phase and amplitude can be mathematically transformed using a near-field to far-field transform to give the far-field pattern.  This region is where, for example in a dish antenna, the beam changes from nearly a parallel beam the same diameter as the dish to a beam diverging at the far-field angle.  The actual power distribution is complicated, but the two patterns intersect at about D^2/lambda, and an arc smoothing this out that is tangent to the parallel beam at the aperture is not far away from the nominal 'beam edge'.

Measurements in the reactive near-field can also be transformed to get the far-field pattern in the same way as in the propagating near-field, but are difficult to make because the probe will probably affect the match of the antenna and change the measurement.

When the reactive fields are mathematically transformed they do not result in any contribution to the far-field pattern, just as in reality they do not.  There are propagating fields close in to the antenna as well, and these transform into the far-field pattern.  Because the different components transform linearly the presence of the reactive field in the data does not change the calculated far-field pattern.

Near-field measurement ranges use this transformation to get the far-field patterns of large antennas with measurements at much smaller ranges than 2D^2/lambda.

If you want to make a simple quick measurement just measuring power, then it has to be at 2D^2/lambda or more to get the far-field pattern.