The present epidemic of coronavirus (COVID-19) was originated in Wuhan, China, on 31 December 2019. After that, it spread worldwide, and continues to this day. Its affects are deadly and keeps all countries around the world in lockdown. Countries are fighting with it by keeping lockdown and by developing vaccines to save human life. Due to this pandemic situation, people who have other diseases are in fear to go to hospitals because of infections. Many medical devices are available to monitor ourselves at home itself, like oximeters, thermometer, blood pressure monitoring devices, and blood sugar monitoring devices. If similar devices were available for breast cancer detection, it would help many women to save their lives and get treatment in time. This chapter focuses on such technology that is known as microwave imaging technology, where wideband antennas play a vital role. The design of such antennas is a challenge for researchers; here, few of the designs of ultra-wideband antenna are presented.