The present invention relates to a communication technique, which is a convergence of IoT technology and 5G communication system for supporting higher data transmission rate beyond 4G system, and a system for same. The present invention can be applied to smart services (e.g. smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail business, security- and safety-related services and the like) on the basis of 5G communication technology and IoT-related technology. The present invention provides an antenna module comprising: a first antenna array configured to form a beam in a specific direction; a second antenna array spaced a predetermined first distance apart from the first antenna array and configured to form a beam in a specific direction; and a lens spaced a predetermined second distance apart from beam radiation surfaces of the first antenna array and the second antenna array and configured to change phases of the beams radiated from the first antenna array and the second antenna array, wherein the lens is divided into a first region and a second region that have different phase-quantized resolutions.