Área efectiva del dipolo:[editar]
Small Dipole with No Heat Loss[editar]
For a small uniform current element the available output power is equal to the induced voltage squared divided by four times the radiation resistance. Thus
The effective area of a half-wavelength dipole with no heat loss is only 9.4 per cent, 0.39 decibels,2 larger than the effective area of the small dipole. Therefore
The area of a rectangle with one-half wavelength and one-quarter wavelength sides is and it is, therefore, a good approximation for the effective areas of small dipoles and half-wavelength dipoles.