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in wireless applications using the MSP antennas in many important application.This paper is introduces Double Hslot patch antenna three-band in C-Band. By using ANSOFT HFSS version 17.2 simulated and described The efficiency of the radiation including Return loss, antenna gain, radiation pattern, VSWR. The structure of this antenna is simpler than other antennas established to achieve three-band characteristics consisting of only a substrate, ground and coaxial feed line. My operate in C=band which in the field (4-8 GHz) and I obtain there frequency (4.01 GHz, 5.81 GHz and 6.55 GHz).the Radiating patch it falls on the Rogers RT/duroid 5880/dielectric constant 2.2 and thickens for it 1.5748mm taken to design a substrate . Coaxial feeding technology is used for feeding the fifteen-ohm antenna. The return loss raises of this antenna suggested (-27.13 dB at 4.01GHz, -21.78 dB at 5.81 GHz, and -13.32 dB at 6 …