Olszewska-Placha, MarzenaMarzenaOlszewska-PlachaVarghese, JobinJobinVargheseSzwagierczak, DorotaDorotaSzwagierczakManhica, BirgitBirgitManhicaZiesche, SteffenSteffenZiescheRudnicki, JanuszJanuszRudnickiSynkiewicz-Musialska, BeataBeataSynkiewicz-Musialska2024-05-072024-05-072024https://publica.fraunhofer.de/handle/publica/46765910.1016/j.materresbull.2024.112862In this study, a new ultra-low-temperature co-fired ceramic (ULTCC) glass-ZnO-SiO2-B2O3single bondCeO2-MgO-Al2O3 composite was developed and its applicability as a dielectric substrate in emerging high-performance communication technologies in the microwave and millimetre-wave frequency ranges was investigated. The novel material composition enables achieving good sinterability at a low fabrication temperature of 470 °C. Extensive studies have been conducted on the microstructure, porosity, water absorption, surface roughness, and thermal expansion coefficient. Following this analysis, the dielectric properties of the bulk glass-ceramic composites and the final ULTCC substrates were characterised. These measurements were conducted within a broad frequency range of 5 GHz-1.1 THz using split-post dielectric resonators, a Fabry-Perot open resonator, and a time-domain spectrometer, resulting in quasi-continuous frequency characteristics of the complex permittivity. Furthermore, the fabricated ULTCC substrates were subjected to surface-wise measurements, which provided 2D maps of the dielectric properties as qualitative and quantitative measures of the uniformity and quality of the material.enceramicselectronic materialscompositesdielectric propertiesdielectricsjournal article