Wire and cable developments applicable to antennas

The past few years have started to show more major imaginative engineering changes and have continued to set the pace for product developments in electrical insulation and jacketing for wire and cable. Power and communication lines in different sizes and forms have evolved to meet the continuing new electrical and electronic requirements, such as miniaturization in coaxial cables. As expected, bottlenecks accompanied growth; examples of past problems include when polyethylene (PE) was almost not developed,¹ when the original polypropylene (PP) caused copper poisoning, and when major fire problems developed. Now PE insulation is the second largest plastics used and by 1971 it will be larger than polyvinyl chloride (PVC); PP due to its toughness and excellent electrical properties is required in different applications such as deep well power cable; fire resistance is provided by PVC.