Green's tensor function has been used as a basis to get the expression for the radiation pattern of a rectangular waveguide radiator array located on an infinite perfectly conducting wedge. The obtained expression has been analyze, which has made it possible to calculate the integral in a complex plane with the help of the saddle-point method.

The algorithm and calculation of radiation patterns have been developed for various parameters included in its expression. The method of calculating cylindrical functions with a random index has been used in the calculation of the patterns.

The results of the radiation pattern numerical studies are given for various parameters included in its expression.