Abstract: An antenna beam control method by adjusting the excitation amplitude rather than the phase of the antenna unit is proposed. The excitation amplitude of each antenna unit at the fixed frequency are calculated based on the hologram and interference theory, and the one-dimensional antenna array can scan the main beam between -30° and 20° after the excitation amplitude of each antenna unit are assigned. The antennas possess the same beam scanning characteristic when the excitation amplitude is replaced by coding “0” and “1”. Moreover,two antenna units s1 and s2 whose radiation efficiency are 46% and 4% at 9.2 GHz respectively are designed , which achieves the one-to-one correspondence with coding “1” and “0”. Two antennas N1 and N2 are fabricated by etching the unit s1 and s2 on Rogers 4003 substrate according to the coding sequences that corresponds to the antenna beam of 0° and -30° respectively. The measured and the simulated results show that a good impedance matching is achieved and the antenna beam are 0° and -30°, which verifies the feasibility of the amplitude weighted technique in antenna beam control.