Permittivity reduction and surface modification by porosification of LTCC

Steinhäußer, Frank; Talai, Armin; Weigel, Robert; Koelpin, Alexander; Bittner, A.; Schmid, Ulrich

doi:10.1016/j.ceramint.2016.02.149

Cited by 10 publications

(1 citation statement)

References 14 publications

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“…Furthermore, the integration of high-k and low-k materials with defined thickness and low loss tangent is crucial for the realization of the next generation of high-frequency circuits [15,17]. It has been recently shown that a defined porosification of sintered LTCC by wet chemical etching can be used to tune permittivity [22,23].Further, porosification depends on the sintering process [24]. Present voids decrease permittivity and loss tangent.…”

Section:  Introductionmentioning

confidence: 99%

Characterization of pores in polished low temperature co-fired glass-ceramic composites for optimization of their micromachining

Bartsch¹,

Lubov²,

Kharlamov³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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Pores are intrinsic defects of ceramic composites and influence their functional properties significantly. Their characterization is therefore a pivotal task in material and process optimization. It is demonstrated that polished section analysis allows for obtaining precise information on pore size, shape, area fraction, and homogeneous distribution. It is proven that laser scanning microscopy provides accurate height maps and is thus an appropriate technique for assessing surface features. Such data is used to compare areas with good and poor polishing results, and various surface parameters are evaluated in terms of their informative value and data processing effort. The material under investigation is a low temperature co-fired ceramic composite. Through statistical analysis of the data, the inclination angle was identified as an appropriate parameter to describe the polishing result. By using masked data, direct conclusions can be drawn about the leveling of load-bearing surface areas, which are crucial in photolithographic processing steps and bonding technology. A broad discussion of different defects based on the results contributes to a critical analysis of the potentials and obstacles of micromachining of low temperature cofired ceramic substrates.

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