In atmosphere laser communication,the relations between the optical emitting antenna aperture and basic parameters(wavelength,communication distance),which influence the optical emitting antenna gain,are analyzed in theory.

The primary function of the optical transmit antenna is to collimate far-field divergence of the laser beam and reduce the size of the laser beam in .

A calculating method of the effective apparent resistivity for the extremely low frequency transmitting antenna site;

Tapered fiber transmitting antenna for atmosphere laser communication;

A SLF (Super Low Frequency) transmitting antenna consists of a grid of long horizontal antenna grounded at each end and can be considered as a loop antenna.

How to protect the optical antenna simply and effectively is an important problem that should be resolved for the laser warning equipment to be used in adverse field conditions.

To overcome the atmospheric attenuation effect,the non-line-of-sight scattering atmospheric optical communication system usually adopt an optical antenna to enhance the signal collection ability and increase its communication distance.