Structural and Dielectric Properties of Glass – Ceramic Substrate with Varied Sintering Temperatures

Alias, Rosidah

doi:10.5772/54037

Cited by 12 publications

(13 citation statements)

References 88 publications

(89 reference statements)

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“…As a result, a marginal decrease in dielectric loss with a slight increase in dielectric constant are observed20. After firing, the improvement in dielectric constant and a remarkable decrease in dielectric loss are mainly due to the densification of sintered tape which occurs by the combined effect of burnout of organic additives, removal of pores, microstructural grain growth and the strong bonding of ceramic particles during sintering53. The sintered ZAT tape shows good microwave dielectric properties with ε r of 9.6 and tan δ of 8.4 × 10 -4 at 5 GHz.…”

Section: Resultsmentioning

confidence: 99%

Can zinc aluminate-titania composite be an alternative for alumina as microelectronic substrate?

Roshni

Sebastian

Surendran

2017

Sci Rep

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Alumina, thanks to its superior thermal and dielectric properties, has been the leading substrate over several decades, for power and microelectronics circuits. However, alumina lacks thermal stability since its temperature coefficient of resonant frequency (τf) is far from zero (−60 ppmK−1). The present paper explores the potentiality of a ceramic composite 0.83ZnAl2O4-0.17TiO2 (in moles, abbreviated as ZAT) substrates for electronic applications over other commercially-used alumina-based substrates and synthesized using a non-aqueous tape casting method. The present substrate has τf of + 3.9 ppmK−1 and is a valuable addition to the group of thermo-stable substrates. The ZAT substrate shows a high thermal conductivity of 31.3 Wm−1K−1 (thermal conductivity of alumina is about 24.5 Wm−1K−1), along with promising mechanical, electrical and microwave dielectric properties comparable to that of alumina-based commercial substrates. Furthermore, the newly-developed substrate material shows exceptionally good thermal stability of dielectric constant, which cannot be met with any of the alumina-based HTCC substrates.

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Section: Resultsmentioning

confidence: 99%

Can zinc aluminate-titania composite be an alternative for alumina as microelectronic substrate?

Roshni

Sebastian

Surendran

2017

Sci Rep

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“…First, according to value of shrinkage in x- and y- axes, it is necessary to enlarge all dimensions of designed device, and second, according to value of shrinkage in z- axis, it is necessary to know exact thickness of substrate after sintering in case for matching device to 50 Ω characteristic impedance (microstrip, stripline, etc.). Consistency and repeatability of shrinkage rate must be the top criteria when designing any LTCC device (Alias, 2013). Shrinkage rate of used LTCC substrates is shown in Table II.…”

Section: Low Temperature Co-fired Ceramic Substratesmentioning

confidence: 99%

Influence of various multilayer LTCC systems on dielectric properties’ stability in GHz frequency range

Rovensky

Pietriková

Vehec

et al. 2016

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Purpose The purpose of this paper is to create multilayer substrate (composite) from various low temperature co-fired ceramic (LTCC) substrates by their mutual combinations and to analyse influence of these multilayer substrates on dielectric properties in GHz frequency range. Design/methodology/approach GreenTape 951, GreenTape 9K7 and Murata LFC were used to create compound multilayer substrates that include three layers: middle layer is from Murata LFC, and both upper and bottom layers are either from GreenTape 951 or GreenTape 9K7. Shrinkage in all x-, y- and z-axes of all substrates including multilayer substrates were analysed, and influence of different shrinkage on dielectric properties was examined by microstrip ring resonators applied on all mentioned of substrates. Findings The middle layer of Murata LFC has significant influence on shrinkage value of composites which has a good repeatability and minimalizes problems with design of multilayer LTCC devices. Impact of middle layer from Murata LFC on dielectric constant is not significant, but on the other hand Q factor (loss tangent) of these composites is increased according to inhomogeneity between single LTCC layers, especially at frequency around 6 GHz. Originality/value The novelty of this work lies in creating multilayers systems from different types of LTCC substrates to find combination with the most suitable physical and dielectric properties for various purposes in GHz range applications.

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“…vibrations, thermal stress, mechanical stress etc. [2]. These properties were the reason why we have decided to analyze stability of LTCC substrates in HF area after accelerated aging tests.…”

Section: Introductionmentioning

confidence: 98%

“…Sintering has significant impact on microstructure and related dielectric properties [2]. During sintering process phases of glass in substrates are changing and their ratio in combination with another factors (size of grains, porosity, etc.)…”

Section: Introductionmentioning

confidence: 99%

Stability of LTCC substrates in high frequency area after accelerated aging tests

Rovensky

Pietriková

Ruman

et al. 2014

Proceedings of the 2014 37th International Spring Seminar on Electronics Technology

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Aim of this paper is to investigate influence of accelerated ageing on dielectric properties of Low Temperature Cop-fire Ceramic (LTCC) substrates with microstrip structure. According to the previous work [1], narrow-band notch filter from 2.4 GHz to 2.5 GHz, for minimalizing impact of WiFi signal on UWB radar systems, was designed and fabricated using two different LTCC substrates' types (DuPont GreenTape 951 and DuPont GreenTape 9K7). All filters were exposed to temperature loads, measured before and after each part of accelerated aging tests. Two types of aging test were chosen: "HTOL" (High Temperature Operation Life) and temperature cycling test. LTCC substrates' stability were derived from the changes in frequency domain characteristic obtained from measurements by Vector Network Analyser (VNA) up to 12 GHz. Results shown that there is no significant difference in stability of DuPont GreenTape 951 and DuPont GreenTape 9K7 loaded by HF and thermal stress.

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Structural and Dielectric Properties of Glass – Ceramic Substrate with Varied Sintering Temperatures

Cited by 12 publications

References 88 publications

Can zinc aluminate-titania composite be an alternative for alumina as microelectronic substrate?

Can zinc aluminate-titania composite be an alternative for alumina as microelectronic substrate?

Influence of various multilayer LTCC systems on dielectric properties’ stability in GHz frequency range

Stability of LTCC substrates in high frequency area after accelerated aging tests

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