TY  - JOUR
AB  - 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.
VL  - 34
IS  - 3
SN  - 1356-5362
DO  - 10.1108/MI-12-2016-0084
UR  - https://doi.org/10.1108/MI-12-2016-0084
AU  - Synkiewicz Beata
AU  - Szwagierczak Dorota
AU  - Kulawik Jan
PY  - 2017
Y1  - 2017/01/01
TI  - Multilayer LTCC structures based on glass-cordierite layers with different porosity
T2  - Microelectronics International
PB  - Emerald Publishing Limited
SP  - 110
EP  - 115
Y2  - 2024/09/18
ER  -