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2005-11-15 News Headlines

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Plastics Provider Meets Insulation Challenge
of Radio Frequency Cables

New PE cellular compounds, from provider of plastics solutions Borealis, achieve the low permittivity requirements of RF cables.

Borealis, provider of plastics solutions, releases a new combination of HDPE and LDPE materials for a variety of radio frequency cable designs.

The increasingly higher operating frequency of 3G mobile phone antenna cables places ever greater demands on the performance of insulation materials. The new combination of BorcellT products, from Borealis, meet the challenge and provide good insulation together with lower signal attenuation than has been possible with previous cellular materials.

The new insulation concept is based on the recently launched Borcell HE1123 high density polyethylene (HDPE) and Borcell LE1120 low density polyethylene (LDPE). These two plastics compounds give excellent foaming in the gas injection extrusion process and offer a broad operating window enabling use in a variety of radio frequency (RF) cable designs.

Borealis is a leading, innovative provider of plastics solutions with more than 40 years of experience in polyethylene (PE) and polypropylene (PP). Borcell is a trademark of Borealis A/S, Denmark. Find information about Borealis.

"Borcell HE1123/LE1120 has been approved for use in all RF cable construction at Draka NK Cables, Finland. It is easily processed and gives excellent cell structure and very low attenuation values" according to R&D manager Vesa Tuunanen at Draka Finland.

The new combination of Borcell products can be optimized to meet the specific needs of each insulation thickness. Click on photo for High Resolution image.

Offering a wide degree of flexibility, the mix ratio of Borcell HE1123 and LE1120 can be optimised to meet the specific requirements of each insulation thickness in order to give the lowest possible attenuation. Due to the optimization of processing conditions, the excellent foaming properties mean that expansion above 80% can be achieved. This meets the low permittivity requirements of RF cables.

Importantly, this combination shows very little tendency to dissipate the signal as the frequency increases with the loss factor low across the frequency band. This is important for the provider of mobile telecommunication services to be able to minimize attenuation in the long cables of high mobile phone antennas.

Borcell HE1123/LE1120 PE cellular compounds provide enhanced transmission properties through uniform and evenly distributed cells, which are essential to obtaining good high electrical performance. In addition, their improved flow properties, melt elasticity and purity ensure superior processing, which allows the cable producer to achieve high line speeds and consistent quality.

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