In this paper we have designed and done the performance analysis on Vivaldi antenna for medical applications. We have extended our analysis on the role of materials which are used in the proposed antenna plays a major role in performance characteristics and structural analysis is also done to improve the performance of the proposed antenna. In the proposed antenna, different slots are included in the structure of antenna not only to increase the gain and directivity also for operating in required frequency range. The antenna which was proposed in this paper, has done its simulation for frequency range of 1 to 40 GHz. The designed antenna is obtained multiple resonant frequencies, which will be used for other applications also. The frequency ranges of the antenna which was operated are 6 GHz to 7 GHz, 8 GHz to 10 GHz, 12 GHz to 14 GHz and 18 GHz to 24 GHz. In that different frequency's ranges, the frequency range from 18 GHz to 24 GHz has a better return loss compare to another frequency's ranges. The number of applications has been offered by the Ultrawide band antennas (UWB) are microwave imaging, satellite applications, wireless communications, ground penetrating radars. By the obtained the simulations results, The proposed antenna is better suitable for microwave imaging and satellite communications. But our main focus on microwave imaging Which are used to detect the body tissues which are complex to detect.