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Multilayer LTCC structures based on glass-cordierite layers with different porosity

Beata Synkiewicz (Kraków Division, Institute of Electron Technology, Kraków, Poland)
Dorota Szwagierczak (Kraków Division, Institute of Electron Technology, Kraków, Poland)
Jan Kulawik (Kraków Division, Institute of Electron Technology, Kraków, Poland)

Microelectronics International

ISSN: 1356-5362

Article publication date: 7 August 2017

Abstract

Purpose

The paper aims to report on fabrication procedure and present microstructure and dielectric behavior of multilayer porous low-temperature cofired ceramic (LTCC) structures based on glass-cordierite and glass-alumina.

Design/methodology/approach

The LTCC structures were created as multi-layered composites with dense external layers and inner layers with intentionally introduced porosity. Two preparation methods were applied – subsequent casting of both kinds of slurries and conventional isostatic lamination of dried green tapes arranged in the designed order. Optical microscope observations were carried out to analyze the microstructure of green and fired multilayer structures and pore concentration. To evaluate the adhesion strength of the composite layers, pull test was performed. Dielectric behavior of the composites was studied in the frequency range 50 kHz-2 MHz.

Findings

The fabricated porous LTCC structures showed dielectric constant of 3-5.6. The lowest dielectric constant was attained for glass-cordierite composite made by the conventional tape casting/lamination/firing method from slurry with 50 per cent graphite content. The samples prepared using multiple casting were of worse quality than those fabricated in conventional process, contained irregular porosity, showed tendency for deformation and delamination and exhibited a higher dielectric constant.

Originality/value

Search for new low dielectric constant materials applicable in LTCC technology and new methods of their fabrication is an important task for development of modern microwave circuits.

Keywords

Acknowledgements

This work has been financially supported by ITE PhD project no. 53.06.008 and by the National Center for Research and Development, Poland, contract no. PBS3/B3/18/2015.

Citation

Synkiewicz, B., Szwagierczak, D. and Kulawik, J. (2017), "Multilayer LTCC structures based on glass-cordierite layers with different porosity", Microelectronics International, Vol. 34 No. 3, pp. 110-115. https://doi.org/10.1108/MI-12-2016-0084

Publisher

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Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited