how to get radiation pattern (2d and 3D) for an antenna?

how to get radiation pattern (2d and 3D) for an antenna?

[Honglei Chen]

This is a very general question. In practice, you can measure the pattern. In theory, you can calculate pattern for certain antennas, such as a Dipole. In computer, you can also simulate patterns for certain antennas. What exactly do you mean?

[darius]

I am exactly looking for mathematical equations, describing 3D radiation pattern for microwaves antennas installed by Mobile Telephony operators on roof tops, on BTS towers to build 3D radiation visualization for a group of microwave antennas installed to verify energy emitted levels. [e-mail]