Motivation for the Development​

• Beyond5G/6G technology, a next-generation information communication infrastructure to be introduced in the 2030s, is considered not just an advanced version of conventional mobile wireless communication, but as an integrated network which comprehensively connects wired- and wireless- communications as well as land-, sea-, air-, and space- communications. This new integrated network is anticipated to establish the base for all types of industries and social activities. Accordingly, a significant increase in the volume of data processing is anticipated due to a rise in the number of sensors and terminal devices.
• To accommodate the increasing data volume, a project to enable a high-speed and high-volume communication using a frequency bandwidth higher than the millimeter wave used for 5G technology is currently underway. The frequency bandwidth between 100 and 300 GHz (sub-terahertz wave) is expected to be used for the project.
• However, 100 GHz or more high frequency electromagnetic waves tend to be reflected by shielding metal plate/foil sheet. Noise generated inside a device may cause self-poisoning. Accordingly, the demand for a noise absorbing material which can accommodate frequencies between 100 and 300 GHz is expected.

Overview of the Development​​

Conventional noise absorbing materials are designed to cancel noise working together with a metal plate leveraging different phases of a reflected wave and an incident wave. There were no materials that independently provided sufficient noise absorbing capability. Another issue with the conventional noise absorbing materials is that they are only available in sheet-type products, making them less workable for application to complicated shapes and corners.
Consequently, we have developed a liquid material which provides sufficient noise absorbing capability independently without the use of a metal plate, etc.