Robust Beam-forming Method Based on Conjugate Virtual Array

In order to improve the performance of antenna array beam-pattern, in this paper, we propose a method of signal vector expansion based on conjugate virtual array. By using conjugate virtual array elements to expand the array, the array aperture is increased without changing the actual number of array elements. Furthermore, the side-lobe level is reduced while the manufacturing cost of the antenna is not increased. The signal steering vector is extended on the basis of the virtual array to make the array beam-forming effect more robust. In this paper, we consider the antennas array with 11 elements which is simulated with or without interference, amplitude and phase errors. The effectiveness of the method is verified by comparing the simulation results of the original array beam-pattern, the virtual array beam-pattern and the beam-pattern after expanding the steering vector.