#### Antenna radiation efficiency tool

The equation used to calculate the antenna radiation efficiency. |

Total antenna efficiency takes into account the reflection, conduction and dielectric losses of an antenna. The dielectric and conduction losses are difficult to compute and in most cases are measured. Even with measurements, they are difficult to separate and are usually lumped together to form the radiation efficiency (ecd). The radiation efficiency is defined as the ratio of the power delivered to the radiation resistance (Rr) to the power delivered to the radiation resistance and the conduction-dielectric resistance (RL), or in equation form as displayed above.

where

e_{cd} = antenna radiation efficiency

R_{r} = radiation resistance

R_{L} = resistance representing the combination of the conduction-dielectric losses.