Electromagnetic power flow and its expression—poynting vector and Nukiyama vector

1995 ◽  
Vol 78 (2) ◽  
pp. 20-32 ◽  
Author(s):  
Toshio Hosono
Keyword(s):  
Power Flow ◽  
Poynting Vector ◽  
Electromagnetic Power

scholarly journals Study of Power Flow in an IPT System Based on Poynting Vector Analysis

Energies ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 165 ◽  
Author(s):  
Yuan Liu ◽  
Aiguo Hu
Keyword(s):  
Output Power ◽  
Power Distribution ◽  
Power Flow ◽  
Poynting Vector ◽  
Current Source ◽  
Arbitrary Point ◽  
Secondary Coil ◽  
Surface Integral ◽  
Vector Method ◽  
Coupled Coils

This paper analyzes the power distribution and flow of an inductive power transfer (IPT) system with two coupled coils by using the Poynting vector. The system is modelled with a current source flowing through the primary coil, and a uniformly loaded secondary first, then the Poynting vector at an arbitrary point is analyzed by calculating the magnetic and electric fields between and around of the two coils. Both analytical analysis and numerical analysis have been undertaken to show the power distribution, and it has found that power distributes as a donut shape in three-dimensional (3D) space and concentrates along the edges in the proposed two-coil setup, instead of locating coaxially along the center path. Furthermore, power flow across the mid-plane between the two coils is analyzed analytically by the surface integral of the Poynting vector, which is compared with the input power from the primary and the output power to the secondary coil via coupled circuit theory. It has shown that for a lossless IPT system, the power transferred across the mid-plane is equal to the input and output power, which validates the Poynting vector approach. The proposed Poynting vector method provides an effective way to analyze the power distribution in the medium between two coupled coils, which cannot be achieved by traditional lumped circuit theories.

scholarly journals Electromagnetic Energy Balance Equations and Poynting Theorem

2020 ◽  
Author(s):  
gaobiao xiao
Keyword(s):  
Energy Balance ◽  
Flux Density ◽  
Poynting Vector ◽  
Power Balance ◽  
Time Varying ◽  
Balance Equations ◽  
Power Flux ◽  
Modified Method ◽  
Electromagnetic Power ◽  
Poynting Theorem

<p>Poynting theorem plays a very important role in analyzing electromagnetic phenomena. The electromagnetic power flux density is usually expressed with the Poynting vector. However, since Poynting theorem basically focuses on the power balance in a system, it is not so convenient in some situations to use it for evaluating the electromagnetic energies. The energy balance issue for time varying fields is revisited in this paper, and a set of energy balance equations are introduced, and a modified method for evaluating power flux is proposed.</p>

scholarly journals Near-zero-index media as electromagnetic ideal fluids

2020 ◽  
Vol 117 (39) ◽  
pp. 24050-24054
Author(s):  
Iñigo Liberal ◽  
Michaël Lobet ◽  
Yue Li ◽  
Nader Engheta
Keyword(s):  
Optical Interconnects ◽  
Electromagnetic Waves ◽  
Power Flow ◽  
Optical Systems ◽  
Dielectric Particles ◽  
Electromagnetic Power ◽  
Interesting Connection ◽  
Ideal Fluids ◽  
Local Properties ◽  
Zero Index

Near-zero-index (NZI) supercoupling, the transmission of electromagnetic waves inside a waveguide irrespective of its shape, is a counterintuitive wave effect that finds applications in optical interconnects and engineering light–matter interactions. However, there is a limited knowledge on the local properties of the electromagnetic power flow associated with supercoupling phenomena. Here, we theoretically demonstrate that the power flow in two-dimensional (2D) NZI media is fully analogous to that of an ideal fluid. This result opens an interesting connection between NZI electrodynamics and fluid dynamics. This connection is used to explain the robustness of supercoupling against any geometrical deformation, to enable the analysis of the electromagnetic power flow around complex geometries, and to examine the power flow when the medium is doped with dielectric particles. Finally, electromagnetic ideal fluids where the turbulence is intrinsically inhibited might offer interesting technological possibilities, e.g., in the design of optical forces and for optical systems operating under extreme mechanical conditions.

Diffraction of Electromagnetic Waves by a Semi-Infinite Screen in a Layered Medium

1975 ◽  
Vol 53 (14) ◽  
pp. 1305-1317 ◽  
Author(s):  
Wiebe G. Heitman ◽  
P. M. van den Berg
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Power Flow ◽  
Layered Medium ◽  
Plane Electromagnetic Wave ◽  
Flow Density ◽  
Two Dimensional ◽  
Electromagnetic Power

The diffraction of a plane electromagnetic wave by a semi-infinite screen in one of the plane interfaces of a layered medium is investigated theoretically. The screen of vanishing thickness is assumed to be electrically perfectly conducting. Two separate two dimensional scalar problems are dealt with, viz. the case of E polarization and H polarization. The resulting unknown field functions are determined with the aid of the Wiener–Hopf technique. Subsequently, the electromagnetic power flow density is calculated at different locations and as a function of the electromagnetic contrast of the different media.

scholarly journals Electromagnetic Energy Balance Equations and Poynting Theorem

2020 ◽  
Author(s):  
gaobiao xiao
Keyword(s):  
Energy Balance ◽  
Flux Density ◽  
Poynting Vector ◽  
Power Balance ◽  
Time Varying ◽  
Balance Equations ◽  
Power Flux ◽  
Modified Method ◽  
Electromagnetic Power ◽  
Poynting Theorem

<p>Poynting theorem plays a very important role in analyzing electromagnetic phenomena. The electromagnetic power flux density is usually expressed with the Poynting vector. However, since Poynting theorem basically focuses on the power balance in a system, it is not so convenient in some situations to use it for evaluating the electromagnetic energies. The energy balance issue for time varying fields is revisited in this paper, and a set of energy balance equations are introduced, and a modified method for evaluating power flux is proposed.</p>

scholarly journals Particle-in-Cell Simulations of Electromagnetic Power-Flow in a Complex 3D Geometry.

2018 ◽  
Author(s):  
S. B. Swanekamp ◽  
A. S. Richardson ◽  
I. Ritterdorf ◽  
J. W. Schumer ◽  
B. V. Weber
Keyword(s):  
Power Flow ◽  
Particle In Cell ◽  
Electromagnetic Power ◽  
3D Geometry
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