Millimeter-wave systems involve using frequencies in the millimeter-wave range (30-300 GHz) for various communication and sensing applications. This research area focuses on developing technologies such as antennas, transceivers, and signal processing techniques to enable high-speed wireless communication, radar systems, and imaging applications. Millimeter-wave systems offer advantages such as high data rates, reduced interference, and improved resolution compared to traditional microwave frequencies. Researchers in this field are exploring ways to overcome challenges such as signal attenuation, scattering, and path loss to realize the full potential of millimeter-wave technology in future wireless networks and sensing applications.