Berlin 2012 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 6: Application of dielectric solids
DF 6.1: Vortrag
Montag, 26. März 2012, 16:50–17:10, EB 107
Dielectric pore-free glass-ceramic materials with good metal adhesion properties for GHz applications — •Hubertus Braun1,2, Martin Letz2, and Martun Hovhannisyan2 — 1Johannes Gutenberg-Universität Mainz — 2Schott AG, Mainz
In recent years, the continuous growth in mobile communication technologies operating in the microwave frequency range demands cost-efficient low-loss dielectric materials with sufficiently high relative permittivity. Conventional microwave devices like antennas or filter elements which operate close to lossy materials, such as human tissue, decrease their performance due to additional dielectric losses (Body Loading effects). These effects can be prevented by using Dielectric Loading. Therefore metallised low-loss high permittivity ceramics (εr≈ 20-80) are needed which allow a high concentration of the EM near-field inside the dielectric and thereby a reduction of external influences. An additional advantage of dielectric loaded devices lies in their smaller size compared to conventional pure metal devices, following the miniaturisation trend of microelectronics of the last decades.
A possible alternative to conventional sinter-ceramic fabrication techniques is glass-ceramic technology in which the desired geometries can be cast to net shape followed by crystallisation to achieve intrinsic pore free materials with the desired dielectric properties and comparatively superior metal adhesion properties. In the current work, promising glass-ceramics in the Rare-Earth-Titanate system are analysed concerning suitability for DLA applications and comparative measurements are made with commercially used sinter-ceramics.