A beamforming Network (BFN) to feed phased array antenna using butler matrix is designed and simulated. BFNs are designed in S band and the frequency of operation is 3.5GHz. The BFN is designed with suitable phase shifters and couplers to obtain various phase changes to steer the beam in the required direction which will be useful in communications. The simulated results show that the beam forming network is able to produce a phase shift of 0.2 degree.