Cellular compound insulates radio cables

Paul Boughton

The increasingly higher operating frequency of 3G mobile phone antenna cables places ever-greater demands on the performance of insulation materials.

To meet this challenge, Borealis is launching a new combination of Borcell products that provides 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 and Borcell LE1120 low-density polyethylene. These two 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.

Offering wide 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 optimisation of processing conditions, the foaming properties mean expansion above 80percent 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.