Results 31 to 40 of about 117,634 (287)

The negative index of refraction demystified

, 2002
We study electromagnetic wave propagation in mediums in which the effective relative permittivity and the effective relative permeability are allowed to take any value in the upper half of the complex plane.
Akhlesh Lakhtakia, Lakhtakia A, Martin W McCall, Pendry J, Veselago V G, Werner S Weiglhofer   +5 more
core   +2 more sources

Characterization of CVD graphene permittivity and conductivity in micro-/millimeter wave frequency range

AIP Advances, 2016
The permittivity and conductivity of chemical vapor deposited monolayer graphene are investigated up to 40 GHz. The characterization method is based on a coplanar waveguide transmission line structure that is fabricated on a multilayer substrate of Si ...
Yunqiu Wu, Yun Wu, Kai Kang, Yuanfu Chen, Yanrong Li, Tangsheng Chen, Yuehang Xu   +6 more
doaj   +1 more source

Imaging of Microwave Permittivity, Tunability, and Damage Recovery in (Ba,Sr)TiO3 Thin Films

, 1999
We describe the use of a near-field scanning microwave microscope to quantitatively image the dielectric permittivity and tunability of thin-film dielectric samples on a length scale of 1 micron. We demonstrate this technique with permittivity images and
Anlage, Steven M., Canedy, C., Melngailis, J., Ramesh, R., Stanishevsky, A., Steinhauer, D. E., Vlahacos, C. P., Wellstood, F. C.   +7 more
core   +1 more source

Evaluating the Relationship Between Relative Permittivity and Infill Density in 3D Printed Dielectric Slabs

IEEE Access
This paper investigates the relationship between relative permittivity and infill density in 3D printed dielectric slabs. As the infill density of a 3D printed substrate is varied, its relative permittivity also varies which affects the performance of ...
Bibek Kattel, Winn Elliott Hutchcraft, Richard K. Gordon   +2 more
doaj   +1 more source

The Effect of Interfacial Zone Due to Nanoparticle–Surfactant Interaction on Dielectric Properties of Vegetable Oil Based Nanofluids

IEEE Access, 2021
Nanoparticles are generally anti-lipophilic and have a tendency to aggregate when they are embedded in nanofluids. Thus, surfactants have a major role in achieving long term dispersion stability of nanofluids through surface modification of nanoparticles.
Rizwan A. Farade, Noor Izzri Abdul Wahab, Diaa-Eldin A. Mansour, Norhafiz B. Azis, Jasronita Bt. Jasni, Veerapandiyan Veerasamy, Arangarajan Vinayagam, Bandanawaz M. Kotiyal, T. M. Yunus Khan   +8 more
doaj   +1 more source

Quantitative imaging of dielectric permittivity and tunability with a near-field scanning microwave microscope

, 2000
We describe the use of a near-field scanning microwave microscope to image the permittivity and tunability of bulk and thin film dielectric samples on a length scale of about 1 micron. The microscope is sensitive to the linear permittivity, as well as to
A. Stanishevsky, Belhadj-Tahar N., C. Canedy, C. P. Vlahacos, D. E. Steinhauer, F. C. Wellstood, J. Melngailis, R. Ramesh, Steven M. Anlage   +8 more
core   +1 more source

Frequency Response Analysis of FAU, LTA and MFI Zeolites Using UV-Vis and Electrochemical Impedance Spectroscopy

Optics, 2023
Zeolites are porous materials that have cavities interconnected by channels. These crystalline materials are composed of Si-O tetrahedral structures, and according to the assembly of such tetrahedral structures, specific crystalline structures are ...
Fabian N. Murrieta-Rico, Joel Antúnez-García, Rosario I. Yocupicio-Gaxiola, Armando Reyes Serrato, Vitalii Petranovskii, Mufei Xiao, Oleg Sergiyenko, Wendy Flores-Fuentes, Julio C. Rodríguez-Quiñonez   +8 more
doaj   +1 more source

Environmental electromagnetic characterization framework for wearable antenna materials [PDF]

, 2014
In wearable antenna design, the prevailing atmospheric conditions can have a significant effect on the electromagnetic properties of the fabric substrate and hence the resulting antenna performances. Therefore, an accurate characterization of this effect
Agneessens, Sam, Couckuyt, Ivo, Declercq, Frederick, Dhaene, Tom, Rogier, Hendrik   +4 more
core   +2 more sources

Dielectric properties of hops - an effect of bulk density

Research in Agricultural Engineering, 2017
Continuous detection of basic physical properties of freshly picked and cleaned wet hop cones would be very helpful for better control and automation of harvesting processes.
Jakub Lev, František Kumhála
doaj   +1 more source

Dielectric properties of materials for 3D printing at high frequencies

Research in Agricultural Engineering, 2023
3D printing is widely used method. In the term of developing of components for electronic devices, it is important to provide the good physical properties of the used dielectric.
Tomáš Pícha, Stanislava Papežová
doaj   +1 more source