Design of Repeat-Antenna Package for Mobile Communication Made of Ferrite-Loaded Glass-Fabric/Epoxy Composites

This paper presents the material design and structural analysis of the repeat antenna used in mobile communication and shows the possibility of replacing the aluminum package of the repeat-antenna system by ferrite-loaded glass-fabric/epoxy composites. The three-phase composite material provided high strength and electromagnetic shielding at 1.8–2.0 GHz, one of frequency ranges used for mobile communication. The Ni–Zn ferrite as an absorbing material was fabricated, and Ni–Zn ferrite/epoxy composite was measured with a network analyzer to obtain complex permittivity and permeability. The characteristics of Ni–Zn ferrite specimens with conductive carbon black were studied, and the matching frequency was adjusted to 2 GHz frequency by controlling the amount of conductive carbon black. The ferrite-loaded glass-fabric/epoxy composite specimens were fabricated, and tensile and bending tests were carried out to evaluate mechanical properties. The structural analysis of antenna package of ferrite-loaded glass-fabric/epoxy composite was conducted for under wind pressure and compared with that of aluminum antenna package.