Microwave imagery for identification of Breast cancer is based on the electrical contrast between fatty breast tissues. We implemented a simple fractal antenna in this paper (peano patch antenna) in the Ultra-Wideband frequency (6.744) GHZ as low as (-42.657 dB). For breast imaging on a microwave system, the option of antenna is made of an antenna array consisting of 18 antennas. For better detection of tumors, the antenna is positioned in a circular design so that it can be faced directly to the phantom of the breast. This choice is made by positioning the array antennas on the breast skin to test the magnetic, electrical fields and current density in healthy tissue of breast phantom built and simulated in the studio simulator CST Microwave.