The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
R.h. Macphie - One of the best experts on this subject based on the ideXlab platform.
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The impedance of a center-fed strip dipole by the Poynting Vector method
IEEE Transactions on Antennas and Propagation, 1995Co-Authors: R.h. Macphie, W. Gross, I.z. LianAbstract:The impedance of a center-fed strip dipole of width w and thickness t, with t/spl Lt/w, is obtained by the Poynting Vector method. With w also taken to be small with respect to the operating wavelength (w/spl Lt//spl lambda/) the surface current on the dipole is modeled by the classical sinusoidal standing wave along its length. There are, however, appropriate transverse singularities assumed at the edges of the strip. The Poynting Vector method leads to a two-dimensional integral in the transverse coordinates involving the classical mutual impedance between filamentary dipoles located on the surface of the strip itself as well as the above mentioned transverse edge singularities. A Legendre series expansion of this mutual impedance (the coefficients obtained by numerical integration) leads to a rapidly convergent series solution (eight terms) for the overall impedance of the strip dipole. Numerical results are provided For a variety of strip widths, thicknesses and lengths. They are compared with the impedances of equivalent circular dipoles of radius a=(w+t)/4 and good agreement occurs except for quite wide strips (w=0.05/spl lambda/).
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The input impedance of a thin dipole with sinusoidal surface current distribution by the Poynting Vector method
IEEE Transactions on Antennas and Propagation, 1995Co-Authors: R.h. Macphie, S.k. DarbhaAbstract:The input impedance of a thin (a/spl Lt//spl lambda/) center-fed dipole with an assumed sinusoidal surface current distribution is obtained by the Poynting Vector method. It is shown that by retaining the surface current distribution rather than replacing it by the classical equivalent line current on the dipole axis, the Poynting Vector method can be used in a straightforward way and the dipole impedance obtained as a series in powers of ka. The series is appropriately truncated to order (ka)/sup 2/ since it is assumed that the dipole is thin (ka/spl Lt/1).
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The impedance of a center-fed strip dipole by the Poynting Vector method
Proceedings of IEEE Antennas and Propagation Society International Symposium, 1993Co-Authors: R.h. MacphieAbstract:The author consider a strip dipole with an assumed current density on its surface and uses the Poynting Vector method to determine the complex power leaving the surface. This makes it possible to obtain the input impedance at the dipole's infinitesimal feed gap.
J F Whitaker - One of the best experts on this subject based on the ideXlab platform.
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an optically interrogated microwave Poynting Vector sensor using cadmium manganese telluride
Optics Express, 2010Co-Authors: Chia Chu Chen, J F WhitakerAbstract:A single cadmium-manganese-telluride crystal that exhibits both the Pockels and Faraday effects is used to produce a Poynting-Vector sensor for signals in the microwave regime. This multi-birefringent crystal can independently measure either electric or magnetic fields through control of the polarization of the optical probe beam. After obtaining all the relevant electric and magnetic field components, a map of the Poynting Vector along a 50-Ω microstrip was experimentally determined without the need for any further transformational calculations. The results demonstrate that this sensor can be used for near-field mapping of the Poynting Vector. Utilizing both amplitude and phase information from the fields in the microwave signal, it was confirmed for the case of an open-terminated microstrip that no energy flowed to the load, while for a microstrip with a matched termination, the energy flowed consistently along the transmission line.
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sensing the microwave Poynting Vector with a cadmium manganese telluride electric magnetic field sensor
Frontiers in Optics, 2009Co-Authors: Chia Chu Chen, J F WhitakerAbstract:A map of the microwave Poynting Vector along a 50-? microstrip was experimentally determined using a single cadmium manganese telluride crystal that exhibits both the Pockels and Faraday effects.
R R Alfano - One of the best experts on this subject based on the ideXlab platform.
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the Poynting Vector and angular momentum of airy beams
Frontiers in Optics, 2008Co-Authors: H I Sztul, R R AlfanoAbstract:We analyze and describe the evolution of the Poynting Vector and angular momentum of the optical Airy beam. A numerical approach is used to show these values explain the acceleration of this beam.
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the Poynting Vector and angular momentum of airy beams
Optics Express, 2008Co-Authors: H I Sztul, R R AlfanoAbstract:We analyze and describe the evolution of the Poynting Vector and angular momentum of the Airy beam as it propagates through space. A numerical approach is used to show the Poynting Vector follows the tangent line of the direction of propagation. A similar approach is used to show that while the total angular momentum of the Airy beam is zero, the angular momentum of the main intensity peak and the Airy “tail” are non-zero.
I.z. Lian - One of the best experts on this subject based on the ideXlab platform.
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The impedance of a center-fed strip dipole by the Poynting Vector method
IEEE Transactions on Antennas and Propagation, 1995Co-Authors: R.h. Macphie, W. Gross, I.z. LianAbstract:The impedance of a center-fed strip dipole of width w and thickness t, with t/spl Lt/w, is obtained by the Poynting Vector method. With w also taken to be small with respect to the operating wavelength (w/spl Lt//spl lambda/) the surface current on the dipole is modeled by the classical sinusoidal standing wave along its length. There are, however, appropriate transverse singularities assumed at the edges of the strip. The Poynting Vector method leads to a two-dimensional integral in the transverse coordinates involving the classical mutual impedance between filamentary dipoles located on the surface of the strip itself as well as the above mentioned transverse edge singularities. A Legendre series expansion of this mutual impedance (the coefficients obtained by numerical integration) leads to a rapidly convergent series solution (eight terms) for the overall impedance of the strip dipole. Numerical results are provided For a variety of strip widths, thicknesses and lengths. They are compared with the impedances of equivalent circular dipoles of radius a=(w+t)/4 and good agreement occurs except for quite wide strips (w=0.05/spl lambda/).
M. Marciniak - One of the best experts on this subject based on the ideXlab platform.
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Monitoring of Electromagnetic Energy Flow in a Confined Region of Evanescent Waves by an Alternative Expression for the Poynting Vector
2019 13th European Conference on Antennas and Propagation (EuCAP), 2019Co-Authors: H. Baghdasaryan, T. Knyazyan, T. Hovhannisyan, A.v. Daryan, M. MarciniakAbstract:For monitoring of energy flow an alternative expression for the Poynting Vector is presented. This expression is an intrinsic integrable function at the boundary problem solution by the method of single expression (MSE). The MSE does not exploit the superposition principle, i.e. does not represent solutions of Helmholtz equation as the sum of counter - propagating waves. This permits to have an alternative expression for the Poynting Vector applicable both in media of a positive product of permittivity and permeability and of a negative product that relevant to the region of evanescent waves as well. At the boundary problem solution by the MSE (that is carried out numerically) it is possible to observe spatial distributions in confined media not only for electric and magnetic field amplitudes, but also the Poynting Vector. The alternative expression for the Poynting Vector in the MSE is in complete agreement with the traditional representation of the Poynting Vector.
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An Alternative Expression of The Poynting Vector Operating in a Confined Region of Evanescent Waves: Natural Function in The Method of Single Expression
2018Co-Authors: H. Baghdasaryan, T. Knyazyan, T. Hovhannisyan, A.v. Daryan, M. MarciniakAbstract:An alternative expression of the Poynting Vector is presented. This expression is an intrinsic function at the electromagnetic wave description in the method of single expression (MSE). The MSE does not represent solutions of the Helmholtz equation as a sum of counter-propagating waves that permits to operate with an alternative expression for the Poynting Vector. At the boundary problems solution carried out numerically by the MSE spatial distributions of electric and magnetic field amplitudes and the Poynting Vector are obtained. An alternative expression of the Poynting Vector is applicable both in confined media of a positive product of permittivity and permeability and of a negative product, that is relevant to the region of evanescent waves. The expression of the Poynting Vector in the MSE is in complete agreement with the traditional representation of the Poynting Vector.
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General Expression of the Poynting Vector Appropriate for Evanescent Wave Region: Intrinsic Function in the Method of Single Expression
2018 20th International Conference on Transparent Optical Networks (ICTON), 2018Co-Authors: H. Baghdasaryan, T. Knyazyan, T. Hovhannisyan, M. MarciniakAbstract:An alternative expression for the Poynting Vector valid for region of evanescent waves is presented. This expression is the intrinsic function in the method of single expression (MSE). The MSE does not exploit superposition principle, i.e. does not represent solutions of Helmholtz's equation as the sum of counter-propagating waves, which permits to have alternative expression for the Poynting Vector valid both in media with a positive product of permittivity and permeability, and at a negative product (relevant to evanescent waves) as well. The boundary problem solution by the MSE permits to observe spatial distributions in a confined medium not only for electric and magnetic field amplitudes, but also for the Poynting Vector. The alternative expression for the Poynting Vector is in perfect agreement with the traditional representation for propagating waves.
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Universal expression for the Poynting Vector applicable for evanescent waves: inherent output from the method of single expression
2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), 2018Co-Authors: H. Baghdasaryan, T. Knyazyan, T. Hovhannisyan, M. MarciniakAbstract:An alternative expression for the Poynting Vector valid for evanescent waves is presented. This expression is the natural variable in the method of single expression (MSE). The MSE does not exploit superposition principle, i.e. not representing solutions of Helmholtz's equation as the sum of counter-propagating waves, which permits to have alternative expression for the Poynting Vector valid both in media with a positive product of permittivity and permeability, and at a negative product (relevant to evanescent waves) as well. The boundary problem solution by the MSE permits to observe spatial distributions in a confined medium not only for electric and magnetic field amplitudes, but also for the Poynting Vector. The alternative expression for the Poynting Vector is in perfect agreement with the traditional representation for propagating waves.
