Automatic measurement, computation and recording of dielectric constant and loss factor vs temperature up to 600 kc

According to specific formulas, the mixing of rubber samples occurs by two methods: open mixing and internal mixing. The effects of frequency, mixing process, carbon black (CB) content, zinc oxide (ZnO) content, and stearic acid (SA) content on the dielectric properties of rubber materials were studied. The results showed that the effects of the mixing process on the dielectric properties of the rubber samples cannot be ignored, and the appropriate mixing process should be selected when preparing the required rubber materials. The dielectric constant and loss factor of the rubber samples vary depending on the frequency. The dielectric constant had a peak and valley value, while the loss factor only had a peak. The dielectric constant and loss factor of rubber samples were significantly affected by the content of CB, ZnO, and SA. The peak frequency decreased with the increase in CB content, however, the dielectric constant increased with an increase in CB content. The higher the ZnO content, the lower the peak frequency. In addition, the dielectric constant and loss factor increased with an increase in ZnO content. The higher the SA content, the greater the peak frequency. In addition, the dielectric constant and loss factor decreased with an increase in SA content. It is hoped that the experimental results obtained can provide guidance for the study of the dielectric properties, microwave absorption properties, and microwave heating characteristics of rubber polymers.

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Computation of Dielectric constant and loss factor of 1-ethyl-3-methylimidazolium chloride (emim)

International Journal of Applied Physics ◽

10.14445/23500301/ijap-v7i1p116 ◽

2020 ◽

Vol 7 (1) ◽

pp. 110-116

Author(s):

Lubis Satzen ◽

Samson D. Yusuf ◽

Abdulmumini Z. Loko ◽

Lucas W. Lumbi

Keyword(s):

Dielectric Constant ◽

Loss Factor ◽

Dielectric Constant And Loss

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Comparative Study of Complex-Ratio-Measuring Circuits and Coaxial Probe in Diagnosis of Breast Tumors

10.20944/preprints202110.0292.v1 ◽

2021 ◽

Author(s):

Nadera Najib ◽

Kok Yeow You ◽

Mauricio Perez ◽

Robin Augustine

Keyword(s):

Dielectric Constant ◽

Phase Shift ◽

Reflection Coefficient ◽

Loss Factor ◽

Breast Tissue ◽

Standard Technique ◽

Diagnostic Purpose ◽

Tissue Samples ◽

Dielectric Constant And Loss ◽

Breast Tissues

A developed six-port reflectometry (SPR) system was integrated to measure the relative permittivity of tumor and normal breast tissue for medical diagnostic purpose. In order to obtain an accurate and precise measurement, the calibration process was done to the SPR using the well-known three-standard technique. Next, the studied dielectric probe was connected to the calibrated measurement-port of the SPR. The open end of the probe aperture was dibbed into the normal and tumor synthetic breast tissue samples to measure the synthetic breast tissues dielectric constant, ɛrʹ, and loss factor, ɛrʺ in the frequency range of 1.5 GHz to 3.3 GHz. Finally, the comparative studies were conducted between commercial VNA with Keysight 85070E dielectric probe and the studied SPR-probe system based on the measured magnitude of the reflection coefficient, phase shift, dielectric constant, and loss factor of the synthetic breast samples. The maximum absolute errors of the measured reflection coefficient magnitude, phase shift, dielectric constant, and loss factor were found to be 0.01, 1.07°, 1.12, and 0.75, respectively. It was ascertained that the predicted dielectric constant, ɛrʹ, is able to differentiate between normal, (ɛrʹ &lt; 50) and tumor, (ɛrʹ &gt; 50) breast tissues.

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