Journal ArticleDOI
Measurement of the Intrinsic Properties of Materials by Time-Domain Techniques
A. M. Nicolson,G. F. Ross +1 more
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In this paper, a method is presented for determining the complex permittivity and permeability of linear materials in the frequency domain by a single time-domain measurement; typically, the frequency band extends from VHF through X band.Abstract:
In this paper a method is presented for determining the complex permittivity and permeability of linear materials in the frequency domain by a single time-domain measurement; typically, the frequency band extends from VHF through X band. The technique described involves placing an unknown sample in a microwave TEM-mode fixture and exciting the sample with a subnanosecond baseband pulse. The fixture is used to facilitate the measurement of the forward- and back-scattered energy, s21(t) and s11(t), respectively. It is shown in this paper that the forward- and back-scattered time-domain "signatures" are uniquely related to the intrinsic properties of the materials, namely, e* and ?*. By appropriately interpreting s21(t) and s11(t), one is able to determine the real and imaginary parts of ? and ? as a function of frequency. Experimental results are presented describing several familiar materials.read more
Citations
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Journal ArticleDOI
Automatic measurement of complex dielectric constant and permeability at microwave frequencies
TL;DR: In this article, a system is employed that automatically measures the complex reflection and transmission coefficients that result when a sample of material is inserted in waveguide or a TEM transmission line.
Journal ArticleDOI
An Overview of the Theory and Applications of Metasurfaces: The Two-Dimensional Equivalents of Metamaterials
Christopher L. Holloway,Edward F. Kuester,Joshua A. Gordon,John F. O'Hara,James C. Booth,David R. Smith +5 more
TL;DR: Metamaterials are typically engineered by arranging a set of small scatterers or apertures in a regular array throughout a region of space, thus obtaining some desirable bulk electromagnetic behavior as mentioned in this paper.
Journal ArticleDOI
Improved technique for determining complex permittivity with the transmission/reflection method
TL;DR: In this article, a robust algorithm for permittivity determination at frequencies corresponding to integer multiples of one-half wavelength in the sample is presented, and an error analysis yielding estimates of the errors incurred due to the uncertainty in scattering parameters, length measurement, and reference plane position is presented.
Journal ArticleDOI
Design, fabrication, and testing of double negative metamaterials
TL;DR: In this paper, the design, fabrication, and testing of several metamaterials that exhibit double negative medium properties at X band frequencies are reported, and the extraction of the effective permittivity and permeability for these metammaterials from reflection and transmission data at normal incidence is treated.
Journal ArticleDOI
EMI shielding effectiveness of carbon based nanostructured polymeric materials: A comparative study
TL;DR: In this paper, the microstructure, electromagnetic interference shielding effectiveness (SE), DC electrical conductivity, AC electrical conductivities and complex permittivity of nanostructured polymeric materials filled with three different carbon nanofillers of different structures and intrinsic electrical properties were investigated.
References
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Book
Dielectric Materials and Applications
TL;DR: Theory of dielectric measuring techniques and their applications as mentioned in this paper Theoretical and practical applications of die-lectric materials include: insulation strength of high pressure gases and of vacuum liquid dielectrics plastics as dielectors ceramics dielectrices in equipment, capacitors in capacitors rubber and plastics in cables problems of the cable engineer, and the requirements of the armed forces.
Journal ArticleDOI
A guided tour of the fast Fourier transform
TL;DR: This article is intended as a primer on the fast Fourier transform, which has revolutionized the digital processing of waveforms and is needed for a whole new range of applications for this classic mathematical device.
Journal ArticleDOI
Broad-Band Microwave Transmission Characteristics from a Single Measurement of the Transient Response
TL;DR: In this paper, a technique for the measurement of the transmission and reflection scattering coefficients of microwave networks by Fourier analysis of the sampled transient response of the network to impulsive or steplike waveforms is presented.