The Measurement of Dielectric Constant and Loss Factor of Liquids and Solutions between 250 and 920 Mc./s. by Means of a Coaxial Transmission Line

1959 ◽  
Vol 63 (4) ◽  
pp. 534-537 ◽  
Author(s):  
Graham Williams
Keyword(s):  
Dielectric Constant ◽  
Transmission Line ◽  
Loss Factor ◽  
Dielectric Constant And Loss

scholarly journals An Experimental Study on the Dielectric Properties of Rubber Materials

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2908
Author(s):  
Hailong Chen ◽  
Yudong Xu ◽  
Mengqi Liu ◽  
Tao Li
Keyword(s):  
Experimental Study ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Loss Factor ◽  
Peak Frequency ◽  
Mixing Process ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Internal Mixing ◽  
Dielectric Constant And Loss

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.

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

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

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

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 < 50) and tumor, (ɛrʹ > 50) breast tissues.

Research on Moulding Process and Dielectric Property of Polyimide Foam

2012 ◽  
Vol 501 ◽  
pp. 215-219 ◽  
Author(s):  
Kai Liang Qi ◽  
Guang Cheng Zhang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Property ◽  
Microwave Heating ◽  
Pore Volume ◽  
Loss Factor ◽  
Cellular Structure ◽  
Precursor Powder ◽  
Foaming Agent ◽  
Moulding Process ◽  
Dielectric Constant And Loss

Foaming moulding process, cellular structure and dielectric property of polyimide (PI) foam which has been prepared by esterification method were discussed. Research results showed that the cell of prepared PI foam was well-distributed and its pore volume and porosity were bigger by microwave heating when methanol was used as the foaming agent and its content in the polyester ammonium salt (PEAS) precursor powder was 13-15%; meanwhile, the dielectric constant and loss factor of PI foam were lower.

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