https://www.sciencedaily.com/releases/2019/06/190603102553.htm

A team of more than 20 researchers at Tokyo Tech and NEC Corporation has successfully demonstrated a 39 GHz transceiver that could be used in the next wave of 5G wireless equipment including base stations, smartphones, tablets and Internet-of-Things (IoT) applications.

Although research groups including the current team have until now largely focused on developing 28 GHz systems, 39 GHz will be another important frequency band for realizing 5G in many parts of the world.