#### xanadu25

##### Newbie level 5

**Antenna Gain Calculation**

Hi, I need to calculate the Radiation Pattern of an antenna. I got S21 Mag and Ang data of the antenna from VNA by measuring the AUT with a standard horn.

Now, how do I calculate the gain of Antenna.What are the conversions of S21 Mag and Ang in dB. How to calculate the gain?

Can someone please write the formulas?