Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first network node may transmit a first signal using a first antenna of the antenna array, the antenna array having a plurality of antennas that are arranged along a curved structure, wherein the curved structure is convex in a direction opposite a transmission direction, and wherein the first antenna is located at a first position on the curved structure so that the first signal has a first aperture with respect to the lens. The first network node may transmit a second signal using a second antenna of the plurality of antennas, wherein the second antenna is located at a second position on the curved structure so that the second signal has a second aperture with respect to the lens. Numerous other aspects are described.