Interaction of plane electromagnetic waves with a moving compressible plasma fluid

1969 ◽  
Vol 47 (4) ◽  
pp. 375-387 ◽  
Author(s):  
H. Fujioka ◽  
F. Nihei ◽  
N. Kumagai
Keyword(s):  
Electric Field ◽  
Electromagnetic Waves ◽  
Surface Charge Density ◽  
Magnetohydrodynamic Wave ◽  
Reflection And Transmission ◽  
Numerical Examples ◽  
Compressible Plasma ◽  
Transmission Coefficients ◽  
Moving Interface ◽  
Magnetoacoustic Waves

The problem of reflection and transmission of plane electromagnetic waves by a semi-infinite compressible plasma fluid moving parallel to its own interface with vacuum is investigated. Solutions are obtained for both incident E wave and H wave. It is found that (i) for the case of incident E wave which excites only two distinct magnetoacoustic waves, the reflection and transmission coefficients add to unity; however, (ii) for the incident H wave which excites only the transverse magnetohydrodynamic wave, both coefficients do not add to unity in general, because of the interaction of the electric field of the transmitted wave with surface charge density at the moving interface. Other interesting features due to the movement of the medium are discussed, and a few numerical examples are given.

Analysis for Scattering of Non-homogeneous Medium by Time Domain Volume Shooting and Bouncing Rays

2021 ◽  
Vol 36 (3) ◽  
pp. 245-251
Author(s):  
Jun Li ◽  
Huaguang Bao ◽  
Dazhi Ding
Keyword(s):  
Time Domain ◽  
Electromagnetic Scattering ◽  
Electromagnetic Waves ◽  
High Efficiency ◽  
Homogeneous Medium ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Transient Electromagnetic ◽  
Frequency Domain Methods ◽  
Scattered Fields

In order to evaluate scattering from hypersonic vehicles covered with the plasma efficiently, time domain volume shooting and bouncing rays (TDVSBR) is first introduced in this paper. The new method is applied to solve the transient electromagnetic scattering from complex targets, which combines with non-homogeneous dielectric and perfect electric conducting (PEC) bodies. To simplify the problem, objects are discretized into tetrahedrons with different electromagnetic parameters. Then the reflection and transmission coefficients can be obtained by using theory of electromagnetic waves propagation in lossy medium. After that, we simulate the reflection and transmission of rays in different media. At last, the scattered fields or radiation are solved by the last exiting ray from the target. Compared with frequency-domain methods, time-domain methods can obtain the wideband RCS efficiently. Several numerical results are given to demonstrate the high efficiency and accuracy of this proposed scheme.

Identities between reflexion and transmission coefficients and electric field components for certain anisotropic modes of oblique propagation

1971 ◽  
Vol 6 (2) ◽  
pp. 257-270 ◽  
Author(s):  
J. Heading
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Differential Equations ◽  
Electric Field ◽  
Electromagnetic Waves ◽  
Electric Polarization ◽  
Stratified Medium ◽  
Transmission Coefficients ◽  
Oblique Propagation ◽  
Integral Identities

A wide-ranging investigation is rendered possible by a judicious combination of products of electric field components and electric polarization components for two distinct modes of propagation of electromagnetic waves in an anisotropic, ionized, stratified medium. The differential equations, governing oblique propagation in these two distinct modes in such a medium, are combined to yield various integral identities when integrated throughout the medium. These lead to a large number of relations between the reflexion and transmission coefficients (for incidence from below and from above) and the fields throughout the medium, each containing as a factor just one of the components of the external magnetic field pervading the medium.

TRANSFORMATION OF SOUND AND ELECTROMAGNETIC WAVES IN NON-STATIONARY MEDIA

2010 ◽  
Vol 24 (18) ◽  
pp. 1951-1961 ◽  
Author(s):  
A. R. MKRTCHYAN ◽  
A. G. HAYRAPETYAN ◽  
B. V. KHACHATRYAN ◽  
R. G. PETROSYAN
Keyword(s):  
Energy Flux ◽  
Sound Wave ◽  
Electromagnetic Waves ◽  
Reflection And Transmission Coefficients ◽  
Sound Waves ◽  
Reflection And Transmission ◽  
Reflected Waves ◽  
Transmission Coefficients

Transformation (reflection and transmission) of sound and electromagnetic waves are considered in non-stationary media, properties of which abruptly change in time. Reflection and transmission coefficients for both amplitudes and intensities of sound and electromagnetic waves are obtained. Quantitative relations between the reflection and transmission coefficients for both sound and electromagnetic waves are given. The sum of the energy flux reflection and transmission coefficients for both types of waves is not equal to one (for sound waves it is greater than one). The energy of both waves is not conserved, that is, exchange of the energy occurs between the corresponding waves and medium. As a result, the sound wave obtains a notable property: the transmitting wave carries energy equal to the sum of the energies of the incident and reflected waves. A possibility of the amplification of sound waves and transformation of their frequencies is illustrated.

Propagation of electromagnetic waves in inhomogeneous plasmas

1994 ◽  
Vol 52 (3) ◽  
pp. 443-456 ◽  
Author(s):  
E. Busatti ◽  
A. Ciucci ◽  
M. De Rosa ◽  
V. Palleschi ◽  
S. Rastelli ◽  
...  
Keyword(s):  
Electromagnetic Waves ◽  
Inhomogeneous Plasma ◽  
Analytical Form ◽  
Reflection And Transmission Coefficients ◽  
Physical Parameters ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Wide Range ◽  
Theoretical Predictions ◽  
Simple Analytical Form

The reflection and transmission coefficients for an electromagnetic beam propagating in an inhomogeneous plasma are calculated analytically using the Magnus approximation in different physical configurations. The theoretical predictions for such coefficients are expressed in simple analytical form, and are compared with the exact results obtained by numerical solution of the wave propagation equations, using the Berreman 4 × 4 matrix method. It is shown that the theoretical approach is able to reproduce the correct results for reflection and transmission coefficients over a wide range of physical parameters. The accuracy of the theoretical analysis, at different orders of approximation, is also discussed.

Ray‐based synthesis of bistatic ground‐penetrating radar profiles

Geophysics ◽  
1995 ◽  
Vol 60 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Jun Cai ◽  
George A. McMechan
Keyword(s):  
Ground Penetrating Radar ◽  
Electromagnetic Waves ◽  
Dynamic Properties ◽  
Reflection And Transmission ◽  
Attenuation Coefficients ◽  
Transmission Coefficients ◽  
Dallas County ◽  
Austin Chalk ◽  
Wave Effects ◽  
Ground Penetrating

An algorithm has been developed to numerically synthesize 2-D bistatic (common‐offset), ground‐penetrating radar (GPR) profiles using the principles of geometrical ray theory. By assuming nondispersive propagation, kinematic properties of electromagnetic waves are simulated by ray tracing. Dynamic properties are simulated by computing transmitter and receiver directivities, reflection and transmission coefficients, geometrical spreading, and attenuation coefficients. The main limitations are that wave effects, such as diffractions, and offline (3-D) effects are not included. The algorithm is applied to iterative modeling of multioffset, multifrequency GPR data acquired over an outcrop of fractured Austin Chalk in Dallas County in northeast Texas. Modeling is able to simulate realistically the main time and amplitude behaviors observed in GPR reflections at 50, 100, and 200 MHz at each of 1, 3, and 5 meter antenna separations from a single model. Detailed modeling produces quantitative estimates of the spatial distributions of electrical properties that are consistent with the geologic environment.

Note on the surface impedance and the transmission of radiation through metal slabs

1970 ◽  
Vol 48 (3) ◽  
pp. 370-375 ◽  
Author(s):  
J. F. Cochran
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Surface Impedance ◽  
Uniform Magnetic Field ◽  
Electric Field Distribution ◽  
Skin Depth ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Field Distributions ◽  
Simple Boundary

An arbitrary electric field distribution in a metal slab in a uniform magnetic field can be written as a linear combination of four functions each of which satisfies Maxwell's equations for particularly simple boundary conditions. In particular, if the slab is thick compared with the skin depth of the radiation, δ, and if (ω/c)δ « 1, then the reflection and transmission coefficients for the slab are proportional to Gx(0), Gy(0), Gx(d), Gy(d) respectively, where Gx(z), Gy(z) are the electric field distributions generated in a slab bounded by the planes z = 0, z = d by a unit alternating magnetic field applied to the surface z = 0 and directed along y.

scholarly journals Reflected and Transmitted Powers of Electromagnetic Waves through a Ferrite-Dielectric Photonic Crystal

2014 ◽  
Vol 33 ◽  
pp. 86-98 ◽  
Author(s):  
Muin F. Ubeid ◽  
Mohammed M. Shabat
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Photonic Crystal ◽  
Electromagnetic Waves ◽  
Magnetic Field Intensity ◽  
Angle Of Incidence ◽  
Reflection And Transmission ◽  
Dielectric Thickness ◽  
Transmission Coefficients ◽  
Ferrite Material

In this work, reflection and transmission of electromagnetic wave by a periodic ferrite-dielectric photonic crystal are investigated theoretically and numerically. The ferrite material is described and its main parameters are given in detail. After the construction of the problem, the reflection and transmission coefficients are derived in a closed form by a transfer matrix method. The reflected, transmitted, and loss powers of the crystal are calculated using these coefficients. In the numerical results the mentioned powers are computed and illustrated as a function of frequency, angle of incidence, dielectric thickness, and applied magnetic field intensity when the damping coefficient changes.

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