Traditional end-fed sleeve dipole array antenna will cause the current distribution to attenuate gradually along the antenna array. This phenomenon not only causes the lower aperture efficiency but also with frequency scan. Lower aperture efficiency and frequency scanning will degrade the antenna performance. In order to solve the lower aperture efficiency and frequency scan characteristics of the end-fed sleeve dipole array, a dual bands three elements printed sleeve dipole antenna array with beam direction at boresight direction has been developed for the application of IEEE 802.11 a/b/g. The size of sleeve dipole antenna array is 220 mm in length, 8 mm in width, and 0.4 mm in thickness The beam direction always points at the boresight direction even if for various frequency operation.