Improvement of highly expanded insulation material for low loss antenna feed coaxial cable for mobile communication in base station

摘要

Highly expanded insulation materials for coaxial cables are composed of blowing agent, nucleating agent and base polymer. After many improvements, coaxial cable with highly expanded insulation material using no fluorocarbon from the view point of environmental protection was found to be appropriate for practical use. Recently with the increase of requirments for superior properties of attenuation constant by small-sizing of antenna feed coaxial cable for mobile communication in base stations and rising of frequency band for next generation handy phone system, the expanded insulation must be improved. In this paper as a result of study on the constituent materials of expanded insulation (blowing agent, nucleating agent and base polymer), we have developed a new cable with lower attenuation (11～19%, at 2GHz) than the conventional cable by selecting the materials with excellent tanδ properties at high frequency band.