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Flexible hybrid electronics (FHE) is an emerging technology enabled throughthe integration of advanced semiconductor devices and 3D printing technology.It unlocks tremendous market potential by realizing low-cost flexible circuitsand systems that can be conformally integrated into various applications.However, the operating frequencies of most reported FHE systems are relativelylow. It is also worth to note that reported FHE systems have been limited torelatively simple design concept (since complex systems will impose challengesin aspects such as multilayer interconnections, printing materials, and bondinglayers). Here, we report a fully 3D-printed flexible four-layer millimeter-waveDoppler radar (i.e., a millimeter-wave FHE system). The sensing performance andflexibility of the 3D-printed radar are characterized and validated by generalfield tests and bending tests, respectively. Our results demonstrate thefeasibility of developing fully 3D-printed high-frequency multilayer FHE, whichcan be conformally integrated into irregular surfaces (e.g., vehicle bumpers)for applications such as vehicle radars and wearable electronics.

A holistically 3D-printed flexible millimeter-wave Doppler radar:  Towards fully printed high-frequency multilayer flexible hybrid electronics  systems