In this paper, the tuning technique of 3-elements cylindrical dielectric resonator antenna (CDRA) array for wireless LAN 802.11 a/b/g standard applications is studied experimentally. The rectangular shaped aperture slots are used to excite the first and last radiating element. The aperture slots etched on the ground plane are excited by using the 50� microstrip transmission line. The electromagnetic coupling technique is used to excite the middle radiating element to enhance the antenna bandwidth as well as gain. The effects of changing the dimensions of slot width on the resonance frequency are also analyzed using a CST microwave studio. The simulated and measured results have successfully given the resonance at 2.45 and 5.0 GHz. The 2-D and 3-D radiation patterns of the proposed dual band antenna are addressed in this paper. © 2013 IEEE.