An animation of dipole wave interference field. Press Space to pause or play the animation.
If one looks carefully at where the wavefield vanishes one can see that they waves have a path difference of half a wavelength or
an odd integral multiples of it there. One can also note that far-field pattern is different from the near-field pattern.
It can be observed that at a distance of half-wavelength the sources when they are in phase as shown interfere destructively
along the dipole axis and constructively normal to it.