Method for forming beams of N-element circular array intelligent antennas

The invention provides a method for forming beams of N-element circular array intelligent antennas. The method includes arranging mode decoupling networks between antenna arrays and beam forming networks and forming decoupling antenna arrays by the antenna arrays and the mode decoupling networks; acquiring scattering matrixes Sn of the decoupling antenna arrays, computing beam forming directional diagram weight vectors W, exciting elements of the antenna arrays by the aid of the beam forming directional diagram weight vectors W and generating corresponding beam directional diagrams. The beam forming directional diagram weight vectors W are used as excitation signals. The method has the advantages that coupling between the elements of the circular array antenna arrays can be effectively inhibited, and accordingly influence of coupling between the elements on beam forming can be reduced; coupling factors no longer need to be considered in computation procedures, accordingly, the complexity of beam forming algor