Research on two-dimensional Sum-difference Network of phased array antenna

In order to meet the requirements of microwave radiation antenna array for its feeding system, a new high-performance two-dimensional Sum-difference Network is designed. The two-dimensional Sum-difference Network consists of a sum and difference device, a Wilkinson power divider and a vertical transition of strip-line to SSMP. The sum port has the characteristics of equal amplitude and phase with port 24 outputs; The pitch difference output port has the characteristics that the amplitude of the upper part and the lower part is equal and the phase difference is 180 degrees; The azimuth difference output port has the characteristics that the amplitude of the left half and the right half is equal and the phase difference is 180 degrees. The simulation optimization design and processing test of the network in K-band are carried out. The simulation and test results agree well. The test results show that the network has good two-dimensional Sum-difference Network characteristics, the reflection coefficient is better than 13dB, and the insertion loss is better than 19.4db.