Measuring complex permittivity for high dielectric losses

1967 ◽  
Vol 10 (12) ◽  
pp. 1513-1515
Author(s):  
L. M. Imanov
Keyword(s):  
Complex Permittivity ◽  
Dielectric Losses ◽  
Measuring Complex ◽  
High Dielectric

Efficient model of an open-ended coaxial-line probe for measuring complex permittivity

2000 ◽  
Author(s):  
Hyun Shin ◽  
Seung-Yeup Hyun ◽  
Sang-Wook Kim ◽  
Se-Yun Kim
Keyword(s):  
Complex Permittivity ◽  
Coaxial Line ◽  
Measuring Complex

scholarly journals Microwave Dielectric Properties of CCTO/PVA Composites

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
M. P. F. Graça ◽  
K. D. A. Sabóia ◽  
F. Amaral ◽  
L. C. Costa
Keyword(s):  
Complex Permittivity ◽  
Effective Medium Theory ◽  
Ceramic Powder ◽  
Microwave Dielectric Properties ◽  
Weight Fraction ◽  
Dielectric Behavior ◽  
X Ray Diffraction ◽  
Medium Theory ◽  
Classical Models ◽  
High Dielectric

The CaCu3Ti4O12 (CCTO) ceramic powder was inserted in the polyvinyl alcohol (PVA) polymeric matrix, with an increasing weight fraction of the filler, to form a flexible and high dielectric constant composite at the GHz region. The structural characterization of the samples was performed using X-ray diffraction and scanning electron microscopy (SEM). The complex permittivity was calculated by the small perturbation theory using two resonant cavities (2.7 GHz and 5.0 GHz). Several classical models (Maxwell Garnett, Lichtenecker, effective medium theory (EMT), and Yamada) were used to fit the real part of the complex permittivity of the composite as a function of the weight fraction of CCTO powder inserted in the PVA matrix. The best predictions for the dielectric behavior of these samples were obtained with the EMT and Yamada models.

Transformer oil-based magnetic nanofluid with high dielectric losses tested for cooling of a model transformer

2019 ◽  
Vol 26 (4) ◽  
pp. 1343-1349 ◽  
Author(s):  
Michal Rajnak ◽  
Milan Timko ◽  
Peter Kopcansky ◽  
Katarina Paulovicova ◽  
Jozef Kuchta ◽  
...  
Keyword(s):  
Transformer Oil ◽  
Dielectric Losses ◽  
Magnetic Nanofluid ◽  
High Dielectric

scholarly journals Complex Permittivity Measurement of High-Loss Biological Material with Improved Cavity Perturbation Method in the Range of 26.5–40 GHz

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1200
Author(s):  
Jialu Ma ◽  
Zhe Wu ◽  
Qiong Xia ◽  
Shaomeng Wang ◽  
Jingchao Tang ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Perturbation Method ◽  
Cancer Cells ◽  
Complex Permittivity ◽  
Dielectric Constants ◽  
Rectangular Cavity ◽  
Ka Band ◽  
High Loss ◽  
Cavity Perturbation ◽  
High Dielectric

In this paper, we performed and designed a new rectangular cavity to identify and analyze the complex permittivity of two cancer cells (Breast-MDA231, Uveal melanoma) that have a high dielectric constant and dielectric loss. The rectangular cavity device is based on the improved cavity perturbation technology. The sample of the improved cavity perturbation device is placed at the position of a/n close to the wall of the cavity, where a is the wide side of the cavity and n is the positive even number. For high-loss biological materials, the improved cavity perturbation method has higher accuracy than the traditional cavity perturbation method. The results present that the relative dielectric constants of a single cell at Ka-band (26.5–40 GHz) are in the range 8–15, and the relative dielectric loss is 24–31. The information of the cancer cells at Ka-band waves can be helpful for further cancer detection and clinical treatment.

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