Toray film has absorpton capacity of 99% for millimetre waves

Author: EIS Release Date: Aug 16, 2023

Toray Industries says it  has developed a film that can efficiently absorb millimetre wave band electromagnetic waves employed in 5G communications and elsewhere.

 

The film delivers an absorption capacity of at least 20 decibels (99%) for millimetre waves and makes it possible to select absorption frequency.

 

It is one-fifth the thickness and one-tenth the weight of conventional counterparts, claims Toray.

 

 

The film eliminates electromagnetic interference in 5G devices incorporating millimetre wave modules. It also helps lighten devices and enhance design flexibility.

 

 

Although millimetre wave technology offers benefits of speed, capacity and latency, it has downsides, notably electromagnetic interference from reflections and interference from the strong linearity of millimeter waves.

 

Electromagnetic sheets absorbing millimetre waves can resolve those issues. The problem with regular sheets is that they are heavy from extensively using metal particles to absorb these waves. The sheets have to be several millimeters thick to ensure absorption. Deploying such sheets with 5G devices has been challenging because of design flexibility and handling ease tradeoffs.

 

Toray  laims to have resolved these issues by applying its proprietary nano-multi-layer film technology. It created a millimetre-wave absorption film with alternating low- and high-dielectric layers. That multilayer structure streamlines millimetre-wave absorption.

 

The sheet is far thinner than conventional counterparts despite its absorption capacity of at least 20 decibels, making it far lighter. Changing the film’s thickness has made it possible to absorb frequencies between 20 and 100 gigahertz.

 

Applying this film around millimetre wave modules can eliminate electromagnetic interference without undermining product design flexibility.