far field वाक्य

The Fresnel diffraction equation is an approximation of far field region is given by the Fraunhofer diffraction equation.
An elliptical beam will invert its ellipticity ratio as it propagates from the far field to the waist.
Reasonably good approximations can be made, however, and these are important in many annular aperture in the far field.
Therefore, projecting image details, normally limited by diffraction into the far field does require recovery of the evanescent waves.
However, a hypothetical outermost ring is in diameter is claimed to be the result of undefined far field stresses.

In both cases, the wave impedance converges on that of free space as the range approaches the far field.
This generates an oscillating ( or reversing ) electrical dipole, which affects both the near field and the far field.
The far-field distance is the distance from the transmitting antenna to the beginning of the Fraunhofer region, or far field.
With conventional optical lenses, the far field is a limit that is too distant for evanescent waves to arrive intact.
The series above are often truncated at n = 2 in the study of far field flow, r \ gg R.