We present a novel antenna based on 2 bit digital coding metasurface and perform convolution operations on the coding antenna to manipulate the radiation waves. Different from the conventional array antennas, we propose to use the metasurface to change the radiation phase of elementary antenna (EA) in a more modular and simpler manner. The radiation beams can be arbitrarily controlled by designing the 2 bit digital coding sequence, and the center operating frequency of the coding antenna is designed at 7.29 GHz. The experimental results of the fabricated prototype antenna show good agreement with the numerical simulations. The proposed 2 bit coding antenna has been demonstrated to possess the capability of achieving beam deflection, multibeam, and perform Fourier operations on the coding antenna. This article raises a new design method of antenna array to control radiation beams.