# DataSet Structure: Directivity

The directivity is a figure of merit indicating in which direction the most energy is radiated. Directivity is the power density radiated in any direction versus an isotropic radiator which is radiating the same amount of energy.

The formula used to calculate directivity is

(1) $D=\text{DirectivityFactor}×\left[\text{Re}{\left({E}_{\theta }\right)}^{2}+\text{Im}{\left({E}_{\theta }\right)}^{2}+\text{Re}{\left({E}_{\varphi }\right)}^{2}+\text{Im}{\left({E}_{\varphi }\right)}^{2}\right]$