The Electromagnetic Properties of Materials Program at Nist

1992 ◽  
Vol 269 ◽  
Author(s):  
Claude M. Weil
Keyword(s):  
Magnetic Materials ◽  
Measurement Techniques ◽  
Electromagnetic Properties ◽  
Microwave Frequencies ◽  
Properties Of Materials

ABSTRACTThe Electromagnetic Properties of Materials (EPM) program at the National Institute of Standards and Technology (NIST) is described, including an outline of the current goals of the project as well as some details of measurement techniques being used at NIST for characterizing dielectric and magnetic materials at RF and microwave frequencies.

Microwave Composite Absorbers Based on Barium Hexaferrite/Carbon Nanotubes for 0.01-18 GHz Applications

2016 ◽  
Vol 685 ◽  
pp. 553-557 ◽  
Author(s):  
Olga A. Dotsenko ◽  
Kirill O. Frolov
Keyword(s):  
Carbon Nanotubes ◽  
Composite Materials ◽  
Magnetic Materials ◽  
Barium Ferrite ◽  
Barium Hexaferrite ◽  
Electromagnetic Properties ◽  
Microwave Frequencies ◽  
New Era ◽  
Barium Hexaferrites ◽  
Multilayer Composites

Nano- and microstructured composite materials have opened a new era for multifunctional materials. In particular, barium hexaferrites and carbon nanotubes can be applied in order to improve electromagnetic properties in composites. Magnetic materials with a texture based on barium ferrite and carbon nanotubes were obtained. The electromagnetic properties of Z – hexaferrites / carbon nanotubes composites were measured at microwave frequencies. It was shown, that imaginary permeability of barium hexaferrites/carbon nanotubes multilayer composites with double texture is as much as that of an isotropic samples at regions 3.4 – 8.5 GHz and 7.1 – 11.6 GHz.

scholarly journals Microwave Measurements of Electromagnetic Properties of Materials

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5097
Author(s):  
Jerzy Krupka
Keyword(s):  
Sheet Resistance ◽  
Transmission Lines ◽  
Complex Permittivity ◽  
Practical Interest ◽  
Measurement Methods ◽  
Electromagnetic Properties ◽  
Complex Permeability ◽  
Microwave Measurements ◽  
Microwave Frequencies ◽  
Properties Of Materials

A review of measurement methods of the basic electromagnetic parameters of materials at microwave frequencies is presented. Materials under study include dielectrics, semiconductors, conductors, superconductors, and ferrites. Measurement methods of the complex permittivity, the complex permeability tensor, and the complex conductivity and related parameters, such as resistivity, the sheet resistance, and the ferromagnetic linewidth are considered. For dielectrics and ferrites, the knowledge of their complex permittivity and the complex permeability at microwave frequencies is of practical interest. Microwave measurements allow contactless measurements of their resistivity, conductivity, and sheet resistance. These days contactless conductivity measurements have become more and more important, due to the progress in materials technology and the development of new materials intended for the electronic industry such as graphene, GaN, and SiC. Some of these materials, such as GaN and SiC are not measurable with the four-point probe technique, even if they are conducting. Measurement fixtures that are described in this paper include sections of transmission lines, resonance cavities, and dielectric resonators.

Applications of metamaterial sensors: a review

2021 ◽  
pp. 1-15
Author(s):  
Divya Prakash ◽  
Nisha Gupta
Keyword(s):  
Electromagnetic Interaction ◽  
High Sensitivity ◽  
Ring Resonators ◽  
Electromagnetic Properties ◽  
Physical Parameters ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Quality Testing ◽  
Properties Of Materials ◽  
Metamaterial Absorbers

Abstract Sensors based on metamaterial absorbers are very promising when it comes to high sensitivity and quality factor, cost, and ease of fabrication. The absorbers could be used to sense physical parameters such as temperature, pressure, density as well as they could be used for determining electromagnetic properties of materials and their characterization. In this work, an attempt has been made to explore the various possible applications of these sensors. Metamaterial-based sensors are very popular for its diverse applications in areas such as biomedical, chemical industry, food quality testing, agriculture. Split-ring resonators with various shapes and topologies are the most frequently used structures where the sensing principle is based on electromagnetic interaction of the material under test with the resonator. Overcoming the design challenges using metamaterial sensors involving several constraints such as cost, compactness, reusability, ease in fabrication, and robustness is also addressed.

scholarly journals A Triaxial Applicator for the Measurement of the Electromagnetic Properties of Materials

Sensors ◽  
2018 ◽  
Vol 18 (2) ◽  
pp. 383 ◽  
Author(s):  
Saranraj Karuppuswami ◽  
Edward Rothwell ◽  
Premjeet Chahal ◽  
Michael Havrilla
Keyword(s):  
Electromagnetic Properties ◽  
Properties Of Materials
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