Abstract: Positive and negative electric charges will undertake accelerated motion when the electric dipole rotates by its center, so the rotational electric dipole will radiate electromagnetic wave. With the formula of magnetic induction intensity produced by electric charge in motion, an expression of variation magnetic field is derived, which is produced by a uniform rotational electric dipole near itself. With the retarding effect of building electromagnetic field, an expression of electromagnetic radiation in far field is also derived for a uniform rotational electric dipole in the non-relative theory. And then comparisons of the similarities and differences in electromagnetic radiation between the uniform rotational electric dipole and the oscillation electric dipole are carried out.

Key words: electric dipole, far field, retarding effect