Abstract:

Circular array is widely used for its whole space beam scanning without the fuzzy. By using the principle of minimum mean square error, the optimal synthesis method of uniform circular array based on directional elements is given. The relevant optimal weighted vectors are respectively given in the two conditions of nonconstrained and null constrained. The method of adding null constrained to the area surrounding the main beam is proposed to lower the high sidelobe level. The simulation analysis shows that the performance improvement in sidelobe level is different when the null constrained is added in different locations, and an obvious performance improvement can be obtained if the null location is suitable. This method is simple and is suitable for circular phased array antenna in application. The null location of the most obvious performance improvement is given.