A Fully 3D-Printed Flexible Millimeter-Wave Doppler Radar

This paper presents a comprehensive 3D-printing process for multilayer millimeter-wave flexible hybrid electronics systems. Based on this approach, a 3D-printed flexible millimeter-wave Doppler radar with a four conductive-layer real 3D structure, multilayer interconnections, and epoxy-based bonding layers is demonstrated. The performances of the proposed radar system under bending were characterized and validated by spectrum tests and field tests.