Complex permeability dependence of commercial LTCC ferritic tape on ambient temperature

This paper deals with material characterization of ferrite LTCC (Low Temperature Co-fired Ceramic) and influence of ambient temperature variation to its complex permeability value. Results of the material characterization (chemical analysis, surface roughness) of commercially available ESL 40011 ferrite tape are presented for the first time. In addition, complex permeability dependence on frequency is determined using previously verified measurement method and developed dispersion model. Complex permeability dependence on ambient temperature variation is also measured in the frequency range up to 1 GHz. Presented results show decrease of complex permeability maximum value with temperature increase from 20°C to 120°C. Cut-back of the useful frequency range of the material is also noticeable in the same temperature range.