Next-Generation Electromaterials Research Group

In the next-generation mobile communication systems, sub-THz waves are expected to be utilized to enhanced mobile broadband (eMBB) and massive machine type communication (mMTC). However, when these sub-THz signals pass through a conductor, they only flow along the surface due to an electromagnetic phenomenon known as the skin effect, resulting in significant transmission loss. To overcome this issue, we are focusing on low-loss conductors known as metaconductors—multilayered structures of conductive and magnetic materials that can suppress electromagnetic induction by using a unique property of negative magnetic permeability in magnetic materials. We are promoting research and development to enable their practical application in high-frequency bandwidths.

Sub-THz waves, which are expected to be used in next-generation high-speed telecommunication systems, propagate in straight lines and cannot easily go around obstacles. To send signals quickly to where they are needed, many special devices known as metasurface reflectors are used. These devices can change the direction of radio waves. Our group is developing new reflectors that can actively control the direction of the signal by changing the material properties using external fields. We are focusing on ferroelectric materials since their electrical properties can be modified by applying an electric field. As such, we are exploring their potential use in metasurface devices.