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Toray presents new low-dielectric-loss PBT for 5G applications
Source:Adsale Plastics Network    Editor:JK    Date:29.Jul.2021

Toray Industries, Inc., has developed a high-performance polybutylene terephthalate (PBT) whose dielectric losses in the high-frequency millimeter wave band are around 40% lower than those of conventional PBT without compromising dimensional stability and moldability.


The new offering product helps enhance the performances of high-speed transmission connectors, communication modules, millimeter wave radars, and other equipment for 5G base stations and automated driving systems.


The company looks to initiate full-fledged sample work to meet demand for materials used in 5G communication materials. It will develop applications for advanced driver-assistance systems and intelligent transportation systems for automated driving setups.


Applications for PBT include automotive, electrical, and electronic parts. This reflects its outstanding balance of dimensional stability, strength, and other performance elements. It is also easy to mold and process.


An application of Toray’s low-dielectric-loss PBT resin.

There has been a growing need in recent years to lower dielectric losses and thereby cut transmission losses in high-frequency components for automated driving and other applications. This has led to the adoption of polymer alloys and fillers. There are limits to reducing dielectric losses, however, as such losses from the resin itself are large. Other issues are heat resistance and mechanical property degradation.


Toray’s PBT delivers a loss tangent of 0.006 in the ultra-wide 79 GHz millimeter wave band. Losses from that factor are around 40% below those of conventional PBT resins while retaining their basic properties. The company constrained the polymer’s molecular motion in the high-frequency range by leveraging polymerization technology to attain a new structure.


The new offering keeps the dielectric loss low across 5G communication frequency bands, from sub-6 GHz through high-frequency millimeter wave bands. Dielectric stability is good in very hot and humid environments. It cuts transmission losses and enables wide-area sensing for incident waves from wide angles, which is an issue in designing high-frequency components.


It has been challenging to downsize products without changing the electrical resistance of electric circuits and connectors. The low dielectric loss of Toray’s new resin makes it possible to keep electrical resistance unchanged, which should contribute to shrinking products, reducing weight, and improving performance.


Toray has commercialized a range of 5G-suitable resins, and will promote its new offering for use in semiconductor devices and electronic components to support advanced communication technologies.



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