"Beam antennas" provide substantial increase in signal directivity over ordinary dipole or vertical antennas. The dipoles do not cancel out, resulting in a net dipole. The T2FD antenna is a folded dipole. It behaves essentially as a dipole antenna. Antennas based on the dipole may include a balun. Light scattering by a molecule is associated with oscillations of an induced electric dipole. The magnetic field of a magnetic dipole is depicted in the figure. H is related to the magnetic dipole density. This can be reduced to a simple dipole using the superposition principle. However, an electric dipole and magnetic dipole are fundamentally quite different. It consists of a periodic structure of dipole magnets. Ozone is a polar molecule with a dipole moment of 0.53 D. A fluorophore is a dipole, surrounded by solvent molecules. The case of a paramagnetic or diamagnetic dipole is considered first. Near the rear is a single active element, typically a half-wave dipole or folded dipole.