A cover of a device acting as an antenna of the device is disclosed. The device comprises a first body and a second body, wherein the first body comprises: a first conductive portion of a first cover of the device configured as an antenna of the device; a second conductive portion of the first cover configured as a ground of the antenna; and a dielectric slot of the first cover; wherein the second body comprises: a first conductive portion of a second cover of the device; a second conductive portion of the second cover; and a dielectric slot in the second cover; wherein a shape of the first and the second conductive portion of the first body and the dielectric slot of the first body aligns with a shape of the first and the second conductive portion of the second body and the dielectric slot of the second body.