Results 291 to 300 of about 118,060 (323)

Wideband Relative Permittivity Characterization of Thin Low Permittivity Textile Materials Based on Ridge Gap Waveguides

IEEE Transactions on Microwave Theory and Techniques, 2016
Medical applications and wearable antennas need accurate electrical characterization of textile material. Many techniques have been presented before to obtain the dielectric constant of any material and some of these techniques are applied on textile materials.
Shoukry I. Shams, Muhammad M. Tahseen, Ahmed A. Kishk   +2 more
openaire   +1 more source

Relative Permittivity Variation Surrounding PCB Via Hole Structures

2008 12th IEEE Workshop on Signal Propagation on Interconnects, 2008
As integrated circuit technology advancements are pushing data rates to 6 Gb/s and beyond, channel simulations are becoming a necessity. As part of the topology modeling and simulation, the correct value of permittivity surrounding a printed circuit board (PCB) via hole structure is required for better accuracy.
openaire   +1 more source

A Review of Empirical Methods to Estimate Relative Permittivity

2018 17th International Conference on Ground Penetrating Radar (GPR), 2018
Four empirical models to estimate the relative permittivity of soil are tested based on a new database of relative permittivity measurements on soils. The selected models are Topp et. al. CRIM, SMDM, and GRMDM. The new database of relative permittivity measurements consists of 124 measurements on five different soils measured at a range of porosities ...
A. J. Rubin, C.L. Ho
openaire   +1 more source

Double-layer studies in solutions of low relative permittivity

Journal of the Chemical Society, Faraday Transactions, 1997
The capacitance of various electrolytes in dichloroethane, anisole and cyclohexane solutions are measured at a platinum electrode. It is found that specific adsorption occurs at large overpotentials from the potential of zero charge (pzc), but a diffuse-layer minimum is observed close to the pzc.
Abbott, AP, Harper, JC
openaire   +2 more sources

Relative permittivity and dielectric relaxation in aqueous alcohol solutions

Fluid Phase Equilibria, 1998
Abstract In this work, our objective was to study the hydrogen bonding of alcohols in aqueous solutions and alcohol dipole relaxation by measuring the complex permittivity. Alcohols chosen for study were methanol, ethanol and propanol over the full composition range and from 297–363 K. Measurements were made with a frequency domain technique from 100
R.L Smith, S.B Lee, H Komori, K Arai
openaire   +1 more source

Determining the relative permittivity of deep embedded biological tissues

2013 US National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM), 2013
Human tissue characterization, deep into the body, has been of interest for decades. X-rays are used for locating tumors. However, such surgery-free identification methods fail to verify whether tumors are benign or malignant without surgical extraction and testing of sample tissue.
Safa Salman, John L. Volakis
openaire   +1 more source

Relative Permittivity Measurement of 3D-textile

2016
The paper deals with the relative permittivity determination of the 3D-textile by a transmission line method (TLM). Measuring points are shifted to avoid inaccuracies caused by transitions between a coaxial cable and a microstrip line. A substrate where the microstrip line is designed is composed of three layers where one layer (3D-textile) has unknown
openaire   +1 more source

Improved Anomaly Characterization in Biological Tissues Through Relative Permittivity Estimation

2024 46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)
Microwave imaging for biomedical applications still suffers from imprecise reconstruction of the relative permittivity (εr) of tissues. Most of the traditional methods employing qualitative measures find it difficult to simultaneously estimate the location and size of the anomaly. This work presents a novel two step approach for improving the detection
Raj, Rakshit, Anwesha, Khasnobish, Annesha, Mazumder, Tapas, Chakravarty   +3 more
openaire   +2 more sources

Polymer-based dielectrics with high permittivity for electric energy storage: A review

Nano Energy, 2021
Jun-Wei Zha, Ming-Sheng Zheng, Zhi-Min Dang   +2 more
exaly  

Precise regulation of weakly negative permittivity in CaCu3Ti4O12 metacomposites by synergistic effects of carbon nanotubes and grapheme

Advanced Composites and Hybrid Materials, 2021
Peitao Xie, Chun-Zhao Liu, Zhanhu Guo
exaly