Poynting vector

[′pȯint·iŋ ‚vek·tər]

(electromagnetism)

A vector, equal to the cross product of the electric-field strength and the magnetic-field strength (mks units) whose outward normal component, when integrated over a closed surface, gives the outward flow of electromagnetic energy through that surface.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Poynting Vector

the vector of the flux density of electromagnetic energy; named after the English physicist J. H. Poynting (1852–1914).

The magnitude of the Poynting vector is equal to the energy transferred per unit time through a unit of surface perpendicular to the direction of propagation of the electromagnetic energy, that is, to the direction of the Poynting vector. In the absolute (Gaussian) system of units, Π = (e/π)[EH], where [EH] is the vector product of the intensities of the electric flux E and magnetic field H and c is the speed of light in a vacuum; in the International System, Π = [EH]. The flow of the Poynting vector through a closed surface bounding a system of charged particles gives the value of the energy lost by the system per unit time as a result of the emission of electromagnetic waves. The momentum density of an electromagnetic field g is expressed in terms of the Poynting vector:

G. IA. MIAKISHEV

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References in periodicals archive

In addition, we have a new velocity field V, which has the role of indicating the direction and speed of development of the energy flow (a sort of generalization of the Poynting vector).

High Frequency Electrical Oscillations in Cavities

The on-surface longitudinal Poynting vector of a 10-wavelength, center-fed dipole consequently also decays with distance as shown in Figure 3 [17].

The Proportionality between Charge Acceleration and Radiation from a Generic Wire Object

Figure 7 demonstrates magnetic field [H.sub.z] (Figure 7(a)) and Poynting vector [P.sub.y] (Figure 7(b)) pattern as a function on [k.sub.x] and y.

Highly Efficient Broadband Light Absorber Based on Nonuniform Hyperbolic Metamaterial Film

It has been obtained that a real part of the Poynting vector normal component of a wave propagating in an anisotropic medium is not equal to zero when an incident wave propagates tangentially to an interface between the media.

Penetration Effect: Exotic Behavior of a Wave in Anisotropic Media

Using the computed electromagnetic field values, the spatial distribution of the surface current density excited on the reflector and on the dipole arms, as well as the real part of the Poynting vector, and the radiation patterns (see Figure 9) have been evaluated at the working frequencies of 5 GHz, 6 GHz, and 7 GHz, both for the antenna with and without metal reflector.

A Low-Profile Reflector-Enhanced Drop-Shaped Printed Antenna for Wide-Band Wireless Communications

The linear momentum density is given by the Poynting vector E x B and the angular momentum is the cross product of the Poynting vector with the position vector.

The structure of the photon in complex vector space

This use of the right hand rule is called the Poynting vector.

Copper roughness electromagnetics 101: why smoothing copper for better signal integrity could degrade mechanical performance

This choice can be expressed by means of the Poynting vector of (E, H) evaluated at [c.sub.n] as

Physics-based expansion on 3D conformal Gaussian beams for the scattering from a curved interface

[r.sub.k] = [[[u.sub.k], [v.sub.k], [w.sub.k]].sup.T] = [[sin [[theta].sub.k] cos [[phi].sub.k], sin [[theta].sub.k] sin [[phi].sub.k], cos [[theta].sub.k]].sup.T] denotes the normalized Poynting vector. [(x).sup.T] denotes the transpose.

Optimal polarization design for direction finding using MIMO electromagnetic vector-sensor array

To this end, let us consider the EM field distribution in the periodic structure and the imaginary part of the Poynting vector. It is generally known, that the Poynting energy flux vector S is a complex quantity [39, 40]

Surface electromagnetic waves in finite semiconductor-dielectric periodic structure in an external magnetic field