Results 21 to 30 of about 18,969 (256)

Complex permittivity of a biased superlattice [PDF]

Journal of Applied Physics, 2008
We study the intersubband response in a superlattice subjected to a homogeneous electric field (a biased superlattice with equipopulated levels) within the tight-binding approximation. We consider the interplay between homogeneous and inhomogeneous mechanisms of broadening.
Hernández-Cabrera, A., Aceituno, P., Vasko, F. T.   +2 more
openaire   +2 more sources

Continuous Characterization of Permittivity over a Wide Bandwidth Using a Cavity Resonator [PDF]

Journal of Electromagnetic Engineering and Science, 2020
We examine a rectangular cavity resonator method to accurately characterize the complex permittivity of dielectric materials over a wide frequency range of 1–5 GHz by exploiting the fundamental mode and higher-order TE(1,0,l) modes.
Rehab S. Hassan, Sung Ik Park, Ashwini Kumar Arya, Sanghoek Kim   +3 more
doaj   +1 more source

Percolation Effect on the Complex Permittivities of Polymer Blends

Polymers, 2023
This study focuses on the measurement and analysis of the complex permittivities of polymer blends using the field enhancement method (FEM). The blends, consisting of air-powder or solvent–solute mixtures, are placed in a Teflon holder and inserted into the FEM cavity to determine the complex permittivity.
Hsien-Wen Chao, Yun-Yu Lai, Tsun-Hsu Chang   +2 more
openaire   +2 more sources

An Open-Resonator Sensor for Measuring the Dielectric Properties of Antarctic Ice

Sensors, 2019
In this paper, the theory behind the design of a microwave sensor for the accurate measurement of firn complex permittivity is presented. This class of microwave sensors, based on the open-coaxial re-entrant cavity method, is specifically designed to ...
Roberto Olmi, Saverio Priori, Alberto Toccafondi, Federico Puggelli   +3 more
doaj   +1 more source

A New Approach to Estimate the Complex Relative Permittivity of Materials Based on Free-Space Reflection Method

Advanced Electromagnetics, 2020
A microwave free-space reflection method for determining the complex permittivity of planar materials is demonstrated. Improved the MUltiple SIgnal Classification (MUSIC) algorithm to estimate the complex relative permittivity of material based on the ...
L. C. Nguyen, M. C. Ho, T.-H. Le
doaj   +1 more source

Measurement of Complex Permittivity in Free Space

Procedia Engineering, 2015
AbstractThe paper describes the measurement of complex permittivity in free space. It is an advanced non-contact method which is used to find the electromagnetic properties of materials. In this case it involves the materials which are used in aviation technology, especially for hardening the avionics against electromagnetic interference. A specialized
Skočík, Petr, Neumann, Petr
openaire   +2 more sources

Complex Permittivity Measurement System for Solid Materials Using Complementary Frequency Selective Surfaces

IEEE Access, 2020
This paper describes a novel method of characterizing complex permittivity using a complementary frequency selective surface (CFSS). The CFSS provides a passband behavior and the change in the passband when a material under test (MUT) is placed adjacent ...
Chih-Kuo Lee, Shiyu Zhang, Syed Sheheryar Bukhari, Darren Cadman, J. C. Vardaxoglou, William G. Whittow   +5 more
doaj   +1 more source

Remote Sensing of Complex Permittivity and Penetration Depth of Soils Using P-Band SAR Polarimetry

Remote Sensing, 2022
A P-band SAR moisture estimation method is introduced for complex soil permittivity and penetration depth estimation using fully polarimetric P-band SAR signals.
Anke Fluhrer, Thomas Jagdhuber, Alireza Tabatabaeenejad, Hamed Alemohammad, Carsten Montzka, Peter Friedl, Ehsan Forootan, Harald Kunstmann   +7 more
doaj   +1 more source

Simplified Complex Permittivity Measurement of Dielectric Materials Using a Compact Waveguide and a Machine Learning Technique [PDF]

Journal of Electromagnetic Engineering and Science
The Nicolson–Ross–Weir (NRW) algorithm is widely used to extract the complex permittivity of dielectric materials. Conventional NRW-based setups typically require machining dielectrics to fit waveguide apertures and to achieve precise adjustment across ...
Min-Seok Park, Jaehoon Cho, Soonyong Lee, Kyung-Young Jung   +3 more
doaj   +1 more source

Precise measurement of complex permittivity of materials for telecommunications devices

Journal of Telecommunications and Information Technology, 2001
In order to obtain precise complex permittivity of the dielectric materials obtained from the perturbation method a correction curve is made using the electromagnetic field simulator which applies transmission line modeling (TLM) method.
Takayuki Nakamura, Yoshio Nikawa
doaj   +1 more source