New dielectric tape materials for LTCC : characterisation and modelling of microwave properties
type: CreativeWork
description: The Low Temperature Co-fired Ceramic technology (LTCC) represents a multilayer functional ceramic substrate, which due to its 3D-Integration feasibility ranks among the key technologies for future hybrid high frequency circuits. In particular the low sintering temperature of <900øC enables the application of high-conductive and low-loss metallization like silver or gold. Nevertheless, new low-sintering microwave ceramics with clearly higher dielectric constant (DK) are demanded for contemporary highly integrated HF circuits. Although many high-dielectric bulk ceramics are known for a long time, but appropriate methods must be developed for lowering the sintering temperatures and the adoption into the LTCC technology. Furthermore advanced non-destructive measuring methods are required for the accurate HF characterisation of the thin LTCC substrates. The available thesis is concerned to the development of new high-dielectric LTCC and its HF characterisation. It introduces beside the conventional glass-derived glass-ceramic approach (called passive sintering) an advanced ceramic rich concept (active sintering), with a clearly smaller portion of the particularly developed low softening B-Bi-SI-Zn glass (BBSZ). Further profound analytical investigations of the glasses and the ceramic-rich glass ceramic composite determine that not only the sinter characteristics of the glasses, but also the solubility and the mobility of the ceramic particles in the glass are significantly responsible for the low densification temperature. While the high-dielectric (DK=15) lanthanum-containing glass (LBT)- used within passive sintering - softens and densifies only between a temperature window of 720-750øC, the BBSZ glass re-amorphs and forms again glass at temperature over 700øC after a former crystallisation at ca. 450øC. Ultimately, an additional increase of the solubility of ceramics with sinter additives such as ZnO results in successfully the densification of BaNd2Ti4O12 microwave c…
abstract: The Low Temperature Co-fired Ceramic technology (LTCC) represents a multilayer functional ceramic substrate, which due to its 3D-Integration feasibility ranks among the key technologies for future hybrid high frequency circuits. In particular the low sintering temperature of <900øC enables the application of high-conductive and low-loss metallization like silver or gold. Nevertheless, new low-sintering microwave ceramics with clearly higher dielectric constant (DK) are demanded for contemporary highly integrated HF circuits. Although many high-dielectric bulk ceramics are known for a long time, but appropriate methods must be developed for lowering the sintering temperatures and the adoption into the LTCC technology. Furthermore advanced non-destructive measuring methods are required for the accurate HF characterisation of the thin LTCC substrates. The available thesis is concerned to the development of new high-dielectric LTCC and its HF characterisation. It introduces beside the conventional glass-derived glass-ceramic approach (called passive sintering) an advanced ceramic rich concept (active sintering), with a clearly smaller portion of the particularly developed low softening B-Bi-SI-Zn glass (BBSZ). Further profound analytical investigations of the glasses and the ceramic-rich glass ceramic composite determine that not only the sinter characteristics of the glasses, but also the solubility and the mobility of the ceramic particles in the glass are significantly responsible for the low densification temperature. While the high-dielectric (DK=15) lanthanum-containing glass (LBT)- used within passive sintering - softens and densifies only between a temperature window of 720-750øC, the BBSZ glass re-amorphs and forms again glass at temperature over 700øC after a former crystallisation at ca. 450øC. Ultimately, an additional increase of the solubility of ceramics with sinter additives such as ZnO results in successfully the densification of BaNd2Ti4O12 microwave c…
author: Naeini Ali Akbari, Ashkan
language: eng
keywords: info:eu-repo/classification/ddc/620, Mikrowellenbauelement, LTCC, Glas, Dielektrische Eigenschaft, Ingenieurwissenschaften, Material Modelling, SPDR, Test Structures
date published: 2004
date modified: 2026-07-30T19:43:19Z
provider: RWTH Aachen University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Publikationsserver der RWTH Aachen University