Breast cancer is the most common form of cancer found in women. Early detection and timely medical treatment are key factors affecting the long-term survival of breast cancer patients. X-ray Mammography is currently the main method of screening for breast cancer. However, exposure to ionizing radiation and high percentage of false negative and false positive diagnosis, expedite the need to develop a complementary or alternative screening method. The main objective of this research is to design and analysis planar antennas in microstrip technology using commercially available electromagnetic field solvers and to design an array of the UWB antenna for Breast Cancer Detection using microwave imaging process. The specific objectives of this research can be listed as follows: i) To design and fabricate three UWB antennas using HFSS and CST software. ii) To compare the performance of the three antennas for selecting best one for microwave imaging. iii) To design an antenna array for microwave breast cancer detection application.