Abstract-This paper presents modeling of the complex permeability spectra, fabrication and a wide frequency range characterization of a toroidal LTCC ferrite sample. A commercial ferrite tape ESL 40012 is used, and standard LTCC (Low Temperature Co-fired Ceramic) processing has been applied to the sample fabrication. The characterization was performed using a short coaxial sample holder and a vector network analyzer in the frequency range from 300 kHz to 1 GHz, at different temperatures. Using the model of the complex permeability spectra dispersion parameters of ferrite LTCC material has been determined for various temperatures. Characteristics of test samples are compared with modeled results and commercially available toroid made of similar NiZn ferrite material.
In this paper, resistive strain gages designed and fabricated in inkjet
printing technology with three different silver nanoparticle inks are
presented. Inks have different Ag content (15, 20 or 25 wt%) and solvents
(water type or organic type). Strain gages were printed on a 50 ?m thick
polyimide and 140 ?m thick PET-based substrate with different printer types
(professional and desktop). All printed sensors have the same size (17 mm ? 5
mm). To determine the change of resistance due to bending of the steel beam,
tensile tests were performed up to 1500 microstrains. Due to performed cycles
of loading and unloading of the steel beam, gauge factor and stability of the
response of the strain gages are measured. Resistance change was measured
with Keithley SourceMeter 2410. For acquisition of measured data, in-house
software tool was developed. Measured gauge factors of the sensors are in the
range between 1.07 and 2.03 (depending on a used ink, substrate and printer).
Results of this research indicate the strain gages with good GF can be
produced even with low-cost equipment, such as desktop printer EPSON C88+ and
PET-based substrate. [Projekat Ministarstva nauke Republike Srbije, br.
TR-32016]
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