Coaxial cables with low losses and a broad temperature range usually use PTFE (Polytetrafluoroethylene) as the isolating material. At elspec we also use PTFE: for the last 32 years it has been the most frequently-ordered basic material besides copper, silver and steel. It is indispensable as requirements have become in-creasingly high, and precise, stable measurements are a necessity.
Therefore, it is of particular concern for the RF-specialist elspec to give an overview of the latest re-search about, and applications of PTFE. We wish to share insights about the properties and the limita-tions of this material, and summarize the various publications on the topic.