Permittivity

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In electromagnetism, permittivity is the measure of the resistance that is encountered when forming an electric field in a medium. (Wikipedia.org)






Conferences related to Permittivity

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2010 9th International Power & Energy Conference (IPEC 2010)

The theme of the conference is "Developing Electrical Power and Energy Systems through Technological Innovation". IPEC2010 welcomes technical contributions in all areas of power engineering and power electronics, with special emphasis on the theme of the conference.

  • 2007 International Power Engineering Conference (IPEC)

    The theme of the conference is "Sustainable Development of Electrical Power Systems: Challenges and Opportunities". Topics of interest include, but are not limited to, Electricity market, system operation and planning, reliability, security and risk assessment, power system modeling, analysis and control, system blackouts, renewable and distributed generation, power electronics, electrical machines and drives, protection, power quality, HVDC and FACTS, asset mgmnt.



Periodicals related to Permittivity

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Dielectrics and Electrical Insulation, IEEE Transactions on

Electrical insulation common to the design and construction of components and equipment for use in electric and electronic circuits and distribution systems at all frequencies.


Geoscience and Remote Sensing Letters, IEEE

It is expected that GRS Letters will apply to a wide range of remote sensing activities looking to publish shorter, high-impact papers. Topics covered will remain within the IEEE Geoscience and Remote Sensing Societys field of interest: the theory, concepts, and techniques of science and engineering as they apply to the sensing of the earth, oceans, atmosphere, and space; and ...


Geoscience and Remote Sensing, IEEE Transactions on

Theory, concepts, and techniques of science and engineering as applied to sensing the earth, oceans, atmosphere, and space; and the processing, interpretation, and dissemination of this information.


Instrumentation and Measurement, IEEE Transactions on

Measurements and instrumentation utilizing electrical and electronic techniques.


Magnetics, IEEE Transactions on

Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The Transactions publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.


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Most published Xplore authors for Permittivity

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Xplore Articles related to Permittivity

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Dielectric properties of supercooled glycerol-water solutions

J. R. Huck; G. A. Noyel; L. J. Jorat IEEE Transactions on Electrical Insulation, 1988

Dielectric properties of glycerol-water mixtures from 5 mHz to 2 MHz are studied over the temperature range 140 to 350 K. Dielectric relaxation time can be fitted according to the new free-volume percolation model of Cohen and Grest (1981, 1984). Static permittivity varies linearly with reciprocal temperature. Suitable extrapolations to zero glycerol concentration allowed the calculation of the dielectric relaxation ...


A novel method for measuring the dielectric properties of solid materials in the microwave range

Patrick Seiler; Bernhard Klein; Niels Neumann; Dirk Plettemeier 2015 IEEE 15th Mediterranean Microwave Symposium (MMS), 2015

In this paper, a novel measurement method for the permittivity of any solid, dielectric material in the microwave range is presented. The general measurement procedure is described, which mainly consists of the measurement of a material under test placed on top of a planar transmission line being measured using on-wafer probes on a wafer probing station. Data on microstrip transmission ...


Live demonstration: Transverse stimulation or artefact?

Erich W. Schmid 2014 IEEE Biomedical Circuits and Systems Conference (BioCAS) Proceedings, 2014

Electric properties of the human tongue are experimentally compared with the properties of a purely ohmic resistor. The tongue shows short and strong displacement currents near voltage steps, which are not present in case of the ohmic resistor. They are not artefacts.


A Fully Integrated Capacitive Pressure Sensor with High Sensitivity

Xiao-Dong Huang; Jian-Qiu Huang; Ming Qin; Qing-An Huang 2007 IEEE Sensors, 2007

A fully integrated absolute capacitive pressure sensor is presented. The sensing structure consisting of poly Si/gate oxide/n well Si sandwich is a solid-state capacitor, which changes under applied pressure due to the variations of the permittivity of the dielectric, the area and distance between the electrodes. The on-chip interface circuit based on capacitance- frequency conversion is also introduced. The device ...


Printed antennas over lossy magneto-dielectric substrates

C. Niamien; S. Collardey; K. Mahdjoubi Proceedings of the Fourth European Conference on Antennas and Propagation, 2010

Since many years there is a growth interest for microstrip antennas due their advantages as for example simplicity, low cost, and compact size. The use of high permittivity dielectric substrates leads to size reduction in printed antennas design, but the antenna performances as the efficiency and the bandwidth are considerably reduced [1-2]. However, the use of magnetic materials can overcome ...


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Educational Resources on Permittivity

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eLearning

Dielectric properties of supercooled glycerol-water solutions

J. R. Huck; G. A. Noyel; L. J. Jorat IEEE Transactions on Electrical Insulation, 1988

Dielectric properties of glycerol-water mixtures from 5 mHz to 2 MHz are studied over the temperature range 140 to 350 K. Dielectric relaxation time can be fitted according to the new free-volume percolation model of Cohen and Grest (1981, 1984). Static permittivity varies linearly with reciprocal temperature. Suitable extrapolations to zero glycerol concentration allowed the calculation of the dielectric relaxation ...


A novel method for measuring the dielectric properties of solid materials in the microwave range

Patrick Seiler; Bernhard Klein; Niels Neumann; Dirk Plettemeier 2015 IEEE 15th Mediterranean Microwave Symposium (MMS), 2015

In this paper, a novel measurement method for the permittivity of any solid, dielectric material in the microwave range is presented. The general measurement procedure is described, which mainly consists of the measurement of a material under test placed on top of a planar transmission line being measured using on-wafer probes on a wafer probing station. Data on microstrip transmission ...


Live demonstration: Transverse stimulation or artefact?

Erich W. Schmid 2014 IEEE Biomedical Circuits and Systems Conference (BioCAS) Proceedings, 2014

Electric properties of the human tongue are experimentally compared with the properties of a purely ohmic resistor. The tongue shows short and strong displacement currents near voltage steps, which are not present in case of the ohmic resistor. They are not artefacts.


A Fully Integrated Capacitive Pressure Sensor with High Sensitivity

Xiao-Dong Huang; Jian-Qiu Huang; Ming Qin; Qing-An Huang 2007 IEEE Sensors, 2007

A fully integrated absolute capacitive pressure sensor is presented. The sensing structure consisting of poly Si/gate oxide/n well Si sandwich is a solid-state capacitor, which changes under applied pressure due to the variations of the permittivity of the dielectric, the area and distance between the electrodes. The on-chip interface circuit based on capacitance- frequency conversion is also introduced. The device ...


Printed antennas over lossy magneto-dielectric substrates

C. Niamien; S. Collardey; K. Mahdjoubi Proceedings of the Fourth European Conference on Antennas and Propagation, 2010

Since many years there is a growth interest for microstrip antennas due their advantages as for example simplicity, low cost, and compact size. The use of high permittivity dielectric substrates leads to size reduction in printed antennas design, but the antenna performances as the efficiency and the bandwidth are considerably reduced [1-2]. However, the use of magnetic materials can overcome ...


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IEEE-USA E-Books

  • No title

    <p>In recent years, transmitarray antennas have attracted growing interest with many antenna researchers. Transmitarrays combines both optical and antenna array theory, leading to a low profile design with high gain, high radiation efficiency, and versatile radiation performance for many wireless communication systems. In this book, comprehensive analysis, new methodologies, and novel designs of transmitarray antennas are presented.</p> <p><ul> <li>Detailed analysis for the design of planar space-fed array antennas is presented. The basics of aperture field distribution and the analysis of the array elements are described. The radiation performances (directivity and gain) are discussed using array theory approach, and the impacts of element phase errors are demonstrated.</li> <li>The performance of transmitarray design using multilayer frequency selective surfaces (M-FSS) approach is carefully studied, and the transmission phase imit which are generally independent from the selection of a specific element shape is revealed. The maximum transmission phase range is determined based on the number of layers, substrate permittivity, and the separations between layers.</li> <li>In order to reduce the transmitarray design complexity and cost, three different methods have been investigated. As a result, one design is performed using quad-layer cross-slot elements with no dielectric material and another using triple-layer spiral dipole elements. Both designs were fabricated and tested at X-Band for deep space communications. Furthermore, the radiation pattern characteristics were studied under different feed polarization conditions and oblique angles of incident field from the feed.</li> <li>New design methodologies are proposed to improve the bandwidth of transmitarray antennas through the control of the transmission phase range of the elements. These design techniques are validated th ough the fabrication and testing of two quad-layer transmitarray antennas at Ku-band.</li> <li>A single-feed quad-beam transmitarray antenna with 50 degrees elevation separation between the beams is investigated, designed, fabricated, and tested at Ku-band.</li></ul> </p> <p>In summary, various challenges in the analysis and design of transmitarray antennas are addressed in this book. New methodologies to improve the bandwidth of transmitarray antennas have been demonstrated. Several prototypes have been fabricated and tested, demonstrating the desirable features and potential new applications of transmitarray antennas.</p>

  • Fan¿¿?Shaped Card Antenna

    This chapter presents an application of the wideband characteristics of the fan¿¿?shaped radiation element to a card antenna, which is abbreviated as the C¿¿?FanSA. The C¿¿?FanSA composes of a fan¿¿?shaped radiation element and a ground plane, both lying in the same plane, and is designed to operate across a wideband frequency range from 3.1 to 10.6 GHz. The antenna height of the fan¿¿?shaped radiation element above the top edge of the ground plane is chosen to be small (1 cm) for use inside IT mobile devices. The chapter shows the configuration of the C¿¿?FanSA and tabulates the summary of configuration parameters. The analysis is performed using the finite¿¿?difference time¿¿?domain method (FDTDM). The fan¿¿?shaped element and the ground plane are made of a thin conducting film, and the fan¿¿?shaped element itself is sandwiched between thin dielectric layers having relative permittivity ¿¿r and thickness B.

  • Transmission Lines

    This chapter contains sections titled: Overview on Transmission Lines Transmission Line Basics Transmission Line Effects Creating Transmission Lines in a Multilayer PCB Relative Permittivity (Dielectric Constant) Routing Topologies Routing Concerns Capacitive Loading References

  • Intrabody Communication

    A different approach is becoming popular nowadays, although it was originally proposed by Zimmerman in 1996. It is based on signal transmission through the human body, called intrabody communication (IBC), and has led to the first definition of Body Area Networks (BANs). This chapter shows the main features of some of the most relevant IBC prototypes reported in the literature depending on the type of coupling, operating frequencies, data rate, and consumption. The characterization of the IBC channel has commonly been carried out by means of the evaluation of path loss as a function of frequency, which is commonly accepted establish frequency ranges for optimum IBC performance. Dielectric dispersion constitutes the dependence of the permittivity of a dielectric material on frequency. The impact of the IBC channel on digital communications can be analyzed by using simulation techniques relying on appropriate channel models.

  • CPW Design Fundamentals

    Quite unlike a microstrip, a coplanar waveguide (CPW) has its principal grounding in the form of wide strips adjacent to the active conductor. Thus, the signal characteristics are almost entirely governed by laterally defined dimensions. The chapter shows how various like quantities effective permittivity, propagation constant, and phase velocity can be defined for basic CPW. CPW exhibits two distinct transmission loss mechanisms: dielectric losses and also ohmic or conductor losses. Radiation losses can also become noticeable with CPW, but this is much lower than with microstrip. CPW is also to some extent dispersive, that is, the transmission phase constant varies non¿¿¿linearly with frequency. The chapter also describes some passive circuit elements that can be formed using the CPW medium. Air bridges are traditionally necessary in order to maintain the dominant mode in CPW. Significant alternatives to the air bridges are the top and bottom metal shields.

  • Characterization of the Host Medium

    For a correct interpretation of the ground-penetrating radar (GPR) signal, it is important to have some estimation of the electromagnetic characteristics of the background medium. A complete characterization theoretically means a measure of the dielectric permittivity and of the magnetic permeability, both meant as complex quantities to account for losses and variables versus the frequency. In many cases, the propagation medium is a low-lossy medium; that is, the real part of the wavenumber is much larger than the imaginary part. The electromagnetic characteristics of the propagation medium depend on its chemical composition, its water content, its porosity, its mineralogy, and possibly its temperature. The measure of the propagation velocity of the electromagnetic waves in a homogeneous soil might be done, in principle, with a buried marker, similarly to what is described for the case of a wall.

  • Microstrip Design at Low Frequencies

    Microstrip is a particularly useful transmission line medium for implementation in distributed circuit designs at frequencies from below 1 GHz and up to 110 GHz. This chapter deals with some fundamental aspects of the microstrip structure, and the realization of dimensional design parameters for establishing desired electrical characteristics. It is concerned with basic considerations and microstrip synthesis where the substrate is a homogeneous, isotropic dielectric. The aspects discussed are quasi¿¿¿transverse electromagnetic mode (TEM) of propagation, static¿¿¿TEM parameter effective microstrip permittivity, characteristic impedance, and filling factor. Graphical technique is mainly suitable for approximate guidance purposes. Hence, closed formulas are needed for accurate static¿¿¿TEM design calculations. The chapter considers microstrip synthesis using a dielectrically anisotropic substrate. It discusses the effects of finite thickness and manufacturing tolerances, and provides a description of pulse propagation. Finally, recommendations for microstrip design are presented.

  • Complex Permittivity of Propagating Media

    This chapter contains sections titled: Introduction Basic Mechanisms of the Propagating Material Permittivity of Permanent Polar Molecules Induced Dipole Moments Induced Dipole Response Function, G() Frequency Character of the Permittivity Kramers-Kronig Relations for Induced Moments Arbitrary Time Stimulus Conduction Electron Permittivity Conductivity Response Function Permittivity of Plasma Oscillations Permittivity Summary Empirical Permittivity Theory Applied to Empirical Permittivity Dispersion of a Signal Propagating through a Medium with Complex Permittivity Endnotes

  • SuperResolving NegativeRefractiveIndex TransmissionLine Lenses

    The prelims comprise: The Distributed Dual Transmission Line The Periodic Dual Transmission Line Interpreting Negative Permittivity and Permeability The 2-D Dual Transmission Line The Negative-Refractive-Index (NRI) TL Lens Reflection and Transmission Through the Lossless NRI-TL Lens The Super-Resolving NRI Transmission-Line Lens An Experimental NRI-TL Lens Characterization of an Experimental NRI-TL Lens An Isotropic 3-D Transmission-Line Metamaterial with a Negative Refractive Index References

  • Dielectric Materials

    This chapter contains sections titled: Historical Survey The Electric Moment of a Neutral System of Charges The Static Macroscopic Electric Field Due to a Volume of Polarized Dielectric Material A Generalization of D0 The Local Field Electronic Polarization Ionic Polarization Orientational Polarization Dielectric Susceptibility, Permittivity, and Relative Dielectric Constant The Static Dielectric Constant of Gases The Static Dielectric Constant of Solids and Liquids The Clausius-Mossotti Equation Primary Static Charges in an Infinite, Homogeneous, Isotropic Medium Ferroelectric Crystals Piezoelectrics Time-Harmonic Fields and Complex Permittivity Time-Harmonic Electronic Polarizability Complex Ionic Polarizability Time-Harmonic Permittivity of Non-Polar Materials Dipolar Relaxation Dielectric Losses Maxwell's Equations for Dielectric Materials This chapter contains sections titled: References Problems



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