Antenna's Power Density!

Radio frequency, which is the electromagnetic frequency that can be radiated into space, ranging from 300 kHz to 300 GHz.
The application primarily calculates the RF power density from the antenna to the center of the radiation.
The calculation formula is based on the “US Environmental Protection Agency, Announcement No. 65 of the US Federal Communications Commission's Engineering and Technology Department”.
Example of use:
Input data: input power of the antenna: 50mW; power gain of the antenna: 0.5; distance to the radiation center of the antenna: 50cm
Output: Power density: 0.00179mW/cm2