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.

Modified cavity perturbation method for high‐precision measurements of complex permittivity throughout the Х‐band

2020 ◽  
Vol 62 (10) ◽  
pp. 3180-3185 ◽  
Author(s):  
Igor Ivanchenko ◽  
Maksym Khruslov ◽  
Nina Popenko ◽  
Vadim Plakhtii ◽  
Vasyl Tkach
Keyword(s):  
Perturbation Method ◽  
High Precision ◽  
Complex Permittivity ◽  
Precision Measurements ◽  
Cavity Perturbation

Enhancement of Dielectric Constants in Strontium Titanate through Mg and Al Doping

2014 ◽  
Vol 608 ◽  
pp. 193-199 ◽  
Author(s):  
Oratai Jongprateep ◽  
Jednupong Palomas ◽  
Tunchanoke Khongnakhon
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Strontium Titanate ◽  
Undoped Sample ◽  
Dielectric Constants ◽  
Fuel Cell Vehicles ◽  
Low Loss ◽  
Al Doping ◽  
Low Dielectric ◽  
High Dielectric

Dielectric capacitors can be utilized in powder conversion systems of applications such as hybrid-electric and fuel cell vehicles. In order to fabricate capacitors that are suitable for practical uses, the materials should have moderately high dielectric constants, while retaining low loss. In this study, strontium titanate and strontium titanate samples doped with 10, 20, 30 at% of Mg and Al were tested for dielectric permittivity and dielectric loss. The results indicated that an increase in the amount of dopants led to enhancement of dielectric constants. The value of dielectric constant of strontium titanate with 30 at% Mg was four times higher than that of the undoped strontium titanate, while the samples with 30 at% Al could achieve the dielectric constant five times higher than that of the undoped sample. Low dielectric loss, in the range between 0.001-0.024, was observed.

scholarly journals A Novel Method Based on Two Different Thicknesses of The Sample for Determining Complex Permittivity of Materials Using Electromagnetic Wave Propagation in Free Space at X-Band

2017 ◽  
Author(s):  
Cuong Ho manh ◽  
Yem Vu van
Keyword(s):  
Dielectric Loss ◽  
Loss Tangent ◽  
Complex Permittivity ◽  
Dielectric Loss Tangent ◽  
Free Space ◽  
Propagation Constant ◽  
High Loss ◽  
Transmission Coefficients ◽  
X Band ◽  
Complex Propagation

In this paper, we present a method for determining complex permittivity of materials using two different thicknesses of the sample placed in free space. The proposed method is based on the use of transmission having the same geometry with different thicknesses with the aim to determine the complex propagation constant (γ). The reflection and transmission coefficients (S11 and S21) of material samples are determined using a free-space measurement system. The system consists of transmit and receive horn antennas operating at X-band. The complex permittivity of materials is calculated from the values of γ, in turns received from S11 and S21. The proposed method is tested with different material samples in the frequency range of 8.0 – 12.0 GHz. The results show that the dielectric loss tangent of low-loss material samples, the more accuracy of complex permittivity. However, the complex permittivity is slightly effected by the dielectric loss tangent of high-loss of material samples.

Fabrication of functionalized graphene filled carboxylated nitrile rubber nanocomposites as flexible dielectric materials

2017 ◽  
Vol 1 (4) ◽  
pp. 780-788 ◽  
Author(s):  
Rakesh Manna ◽  
Suneel Kumar Srivastava
Keyword(s):  
Tensile Strength ◽  
Dielectric Loss ◽  
Dielectric Materials ◽  
Nitrile Rubber ◽  
Dielectric Constants ◽  
Functionalized Graphene ◽  
Elongation At Break ◽  
Low Dielectric ◽  
Rubber Nanocomposites ◽  
High Dielectric

XNBR/GNS–HDA nanocomposites exhibited enhanced tensile strength, elongation at break, reduced Young's modulus and high dielectric constants at low dielectric loss.

Broadband complex permittivity measurements of nematic liquid crystals based on cavity perturbation method

2019 ◽  
Vol 47 (1) ◽  
pp. 89-98
Author(s):  
Chengyong Yu ◽  
En Li ◽  
Zhiyong Zhang ◽  
Xiangru Wang ◽  
Chong Gao ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Perturbation Method ◽  
Complex Permittivity ◽  
Nematic Liquid Crystals ◽  
Cavity Perturbation ◽  
Permittivity Measurements
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