Scattering Characteristics of Stratified Double Negative Stacks Using the Frequency Dispersive Cold Plasma Medium

2007 ◽  
Vol 62 (5-6) ◽  
pp. 247-253 ◽  
Author(s):  
Cumali Sabah ◽  
Savas Uckun
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Electric Field ◽  
Cold Plasma ◽  
Plane Electromagnetic Wave ◽  
Numerical Results ◽  
Double Negative ◽  
Plasma Medium ◽  
Double Positive ◽  
Perpendicular Polarization

We present the wave propagation through stratified double negative stacks to illustrate the scattering characteristics of their structure. The double negative stacks are modeled by using the hypothetical non-dispersive and the frequency dispersive cold plasma media. The stacks are embedded between two double positive media and the incident electric field is assumed a plane electromagnetic wave with any arbitrary polarization. By imposing the boundary conditions, the relations between the fields inside and outside the stacks can be written in a matrix form. Using this transfer matrix, the incident, reflected, and transmitted powers are derived. The variations of the powers for the stratified double negative stacks using the frequency dispersive cold plasma medium have not been investigated yet, in detail. Thus, their characteristics for the perpendicular polarization is computed and presented in numerical results with the emphasis on the plasma frequencies. It is seen from the numerical results that the stratified double negative stacks can be used as electromagnetic filters at some frequency bands.

Plane Wave Interaction with an Inhomogeneous Warm Plasma Column

1971 ◽  
Vol 49 (20) ◽  
pp. 2578-2588 ◽  
Author(s):  
Kanwal J. Parbhakar ◽  
Brian C. Gregory
Keyword(s):  
Electric Field ◽  
Electron Temperature ◽  
Plasma Column ◽  
Cold Plasma ◽  
Plane Electromagnetic Wave ◽  
Wave Interaction ◽  
Radial Electric Field ◽  
Main Resonance ◽  
At Resonance ◽  
Warm Plasma

The interaction of a plane electromagnetic wave with an inhomogeneous warm plasma column is studied as a boundary value problem using a wave matching method. The plasma is characterized by a uniform electron temperature T and a parabolic density distribution N00 (1 − αr2/α2), where N00 is the central line density, α the inhomogeneity parameter, and a the column radius. The coupled Maxwell's and first two moment equations, assuming scalar pressure, are solved numerically without the quasi-static assumption. The resonances cannot be characterized by a single parameter; the effects of α, T, and N00 are studied separately. The resonances are located by noting that the magnitude of the scattering coefficient is unity (for a unit amplitude incident wave) at resonance. The maxima in the scattering are associated with the maxima in the coupling.It is found that the dielectric or the main resonance is a reasonably good radiator, while the plasma wave resonances (Tonks–Dattner resonances) are rather poor radiators. A detailed analysis of the radial electric field inside the plasma indicates that the main resonance is essentially a cold plasma resonance. As for the resonant frequencies, our results are in good agreement with those of Parker, Nickel, and Gould.The radial electric field at resonance inside the plasma is very sensitive to electron temperature.For the main resonance the field distribution at low electron temperature approaches that of a uniform cold plasma at resonance.

Reflection of waves at an interface in a streaming plasma

1968 ◽  
Vol 2 (3) ◽  
pp. 381-393
Author(s):  
P. C. Clemmow ◽  
E. Ott
Keyword(s):  
Electromagnetic Wave ◽  
Half Space ◽  
Cold Plasma ◽  
Plane Electromagnetic Wave ◽  
Plasma Stream ◽  
Relativistic Velocity ◽  
Reflected Wave ◽  
First Approximation ◽  
Transmitted Waves ◽  
The Face

A uniform, unbounded, cold plasma stream, with relativistic velocity (0,U, 0), traverses a vacuum half-spacey> 0 and a dielectric half-spacey< 0. A plane electromagnetic wave in the plasma stream iny> 0 is incident obliquely on the face of the dielectric. The criterion for determining which characteristic waves are present in each half space is discussed, and it is shown that, for the polarization in which B is parallel toy= 0, there is one reflected wave and three transmitted waves. One of the latter can be an amplifying wave. A first approximation to the transmission and reflexion coefficients is found in the case when the density of the stream is low.

SCATTERING BY A PERFECTLY CONDUCTING CYLINDER IN A GYROELECTRIC MEDIUM: NUMERICAL RESULTS

1964 ◽  
Vol 42 (5) ◽  
pp. 860-872 ◽  
Author(s):  
S. R. Seshadri
Keyword(s):  
Electromagnetic Wave ◽  
Circular Cylinder ◽  
Cross Sections ◽  
Plane Electromagnetic Wave ◽  
Numerical Results ◽  
Gyrotropic Medium ◽  
Magnetic Vector ◽  
Scattering Cross ◽  
Incident Plane ◽  
Scattering Cross Sections

The numerical results on the various scattering cross sections of a perfectly conducting circular cylinder embedded in a gyrotropic medium are presented for the case in which both the gyrotropic axis and the magnetic vector of the incident plane electromagnetic wave are parallel to the axis of the cylinder.

scholarly journals VIII. Numerical results of the theory of the diffraction of a plane electromagnetic wave by a perfectly conducting sphere

1918 ◽  
Vol 217 (549-560) ◽  
pp. 279-314 ◽  
Keyword(s):  
Electromagnetic Wave ◽  
Plane Electromagnetic Wave ◽  
Numerical Results ◽  
Subsequent Work ◽  
Conducting Sphere ◽  
Derivatives Of

1. At the suggestion of Dr. Bromwich, I began the computations leading to this paper nearly three years ago. Using tables constructed by Lord Rayleigh and Prof. A. Lodge, I obtained results for k a = 1, 2, 10 and θ = 0°, 180°; 90°; 45°, 135°; 20°,160°; 70°, 110°; in this order. From the results for 1 and 2, graphs of Y 1 , Y 2 , Z 1 , Z 2 could be constructed with some confidence, but such graphs were entirely impossible in the case of k a = 10, owing to the large number of their undulations. (For the graphs of these functions, as finally drawn, see figs. 1, 3, 18, 20, 22, 24.) I then handed over the work to Messrs. Doodson and Kennedy, and the whole of the results as they now appear are due to them. Mr. Doodson first constructed tables for Bessel’s functions of half-integral orders, and Mr. Kennedy constructed tables for the derivatives of Legendre's functions. These two sets of tables, together with those of Lodge already quoted, are what have been used in all the subsequent work.

Electromagnetic wave propagation through frequency-dispersive and lossy double-negative slab

2007 ◽  
Vol 15 (3) ◽  
Author(s):  
C. Sabah ◽  
S. Uçkun
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Electromagnetic Wave Propagation ◽  
Incidence Angle ◽  
Slab Thickness ◽  
Double Negative ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Frequency Changes ◽  
Infinite Media

AbstractThis study presents the electromagnetic wave propagation through the frequency-dispersive and lossy double-negative slab embedded between two different semi-infinite media. The double-negative slab is realized by using two models, the Lorentz and Drude medium models. The properties and the required equations for the frequency-dispersive and lossy double-negative slab, the Lorentz medium and Drude medium are given in detail. After the construction of the problem, the reflection and transmission coefficients are derived for both TE and TM waves. Then, the reflected, transmitted and loss powers are determined using these coefficients. Finally, in the numerical results, the mentioned powers for TE and TM waves are computed and illustrated as a function of the incidence angle, the frequency and the slab thickness when the damping frequency changes.

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