In radar and space communication applications patch antennas have attracted much interest due to their compactness and dual-frequency operation. They are inexpensive to fabricate, light in weight, and can be made conformable with planar and no- planar surfaces. This paper presents the design of a dual-band micro strip patch antenna using IE3D for wireless communication .The antenna is designed as a patch with two slots. The method effectively obtains the geometric parameters for efficient antenna performance. The simple rectangular dual-band micro strip patch antenna is simulated with IE3D and MATLAB and their corresponding result is compared. We analyzed micro strip antenna in IE3D by finite moment of method. The proposed antenna design on different-2 positions of slots in geometry1,geometry2,geometry3 and analyzed result between 1GHz to 15GHz,When the proposed antenna design on a 125 mil RT DUROID 5870 substrates with dielectric constant of 2.33and loss tangent of .0005.