Where: 
The angular wavenumber \(k=\frac{2\pi }{\lambda } \) expresses the number of radians in a unit of distance 
N = number of antenna elements 
\(a_{n}\) = weight of nth antenna element 
\(d_{n}\) = distance of nth antenna element from first element in \(\lambda \) 
\(\beta \) = relative phase shift 
For the above nonuniform distance antenna array calculator the phase value of each element has to be in degrees relative to the first element 
Other Related Calculator:

Linear Uniform Antenna Arrays