Effect of the sheath thickness of thin inhomogeneous plasma layer on the propagation constant for the surface waves

2017 ◽  
Vol 24 (4) ◽  
pp. 042103 ◽  
Author(s):  
Wenqiu Li ◽  
Gang Wang ◽  
Dong Xiang ◽  
Xiaobao Su
Keyword(s):  
Surface Waves ◽  
Plasma Layer ◽  
Propagation Constant ◽  
Inhomogeneous Plasma ◽  
Sheath Thickness

The effect of gradients of density and static magnetic field on the propagation of surface waves and on wave–beam interaction

1973 ◽  
Vol 10 (3) ◽  
pp. 359-369 ◽  
Author(s):  
V. V. Demchenko ◽  
N. M. El-Siragy ◽  
A. M. Hussein
Keyword(s):  
Magnetic Field ◽  
Surface Wave ◽  
Surface Waves ◽  
Static Magnetic Field ◽  
Natural Frequencies ◽  
Propagation Constant ◽  
Inhomogeneous Plasma ◽  
Particle Beam ◽  
Charged Particle Beam ◽  
Axial Density

The propagation of slow surface waves in an inhomogeneous plasma is investigated. Both ‘axial’ and ‘radial’ density gradients n(r) and those of the static magnetic field B0 are taken into account. It is demonstrated that the axial in- homogeneities n(z) and B0(z) result in the dependence of the natural surface- wave frequencies on the ‘axial’ co-ordinate z. The dependence ωSW(z) affects the phase velocity νph = ωswsol;K where K iS the propagation constant. So, in the case of surface-wave excitation by a charged particle beam in an ‘axially’ inhomogeneous plasma, the Cherenkov resonance ωSW= KV0 between the beam and the surface waves breaks, thereby reducing the growth rate of unstable oscillations. This phenomenon might be considered as the stabilization of the beam by the ‘axial’ density gradient. It is also shown that the ‘radial’ gradients n0(r) and B0(r) essentially affect the surface-wave natural frequencies as well. Dispersion equations, expressions for the natural frequencies and growth rates are obtaind, taking into account the gradients of the density and the static magnetic field.

scholarly journals Electromagnetic surface waves supported by a resistive metasurface-covered metamaterial structure

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Z. Yaqoob ◽  
A. Ghaffar ◽  
Majeed A. S. Alkanhal ◽  
M. Y. Naz ◽  
Ali H. Alqahtani ◽  
...  
Keyword(s):  
Surface Waves ◽  
Propagation Constant ◽  
Effective Permittivity ◽  
Phase Speed ◽  
Transverse Magnetic ◽  
Geometrical Parameters ◽  
Causality Principle ◽  
Metamaterial Structure ◽  
Impedance Boundary ◽  
Mode Index

Abstract This study examines the analytical and numerical solution of electromagnetic surface waves supported by a resistive metasurface-covered grounded metamaterial structure. To simulate the metamaterial, the Kramers–Kronig relation based on the causality principle is used, while the modeling of the resistive metasurface has been done by implementing the impedance boundary conditions. The analytical expressions for the field phasors of surface waves are developed for the transverse magnetic (TM) polarized mode and transverse electric (TE) polarized mode. The characteristic equations are computed for both modes, and the unknown propagation constant is evaluated numerically in the kernel. After computation, the dispersion curves, electric field profiles, effective mode index ($$N_{eff}$$ N eff ), and phase speeds ($$v_{p}$$ v p ) are presented for both the TM and TE polarized modes. To study the tunability of surface waves, the influence of the thickness of the metamaterial slab ($$d$$ d ), effective permittivity of the metamaterial ($$\varepsilon_{1}$$ ε 1 ), thickness of the resistive metasurface ($$t$$ t ), and effective permittivity of the metasurface ($$\varepsilon_{r}$$ ε r ) on all the numerical results has been studied. However, the geometrical parameters are found to be more sensitive to the effective mode index ($$N_{eff}$$ N eff ) and phase speed ($$v_{p}$$ v p ) of the surface waves. The results are consistent with the published results, which reflects the accuracy of the work. It is concluded that the appropriate choice of parameters can be used to achieve surface waves with the desired characteristics in the GHz range. The present work may have potential applications in surface waveguide design, surface wave speed controllers, surface communication devices, and light trapping configurations.

scholarly journals Research on radiation characteristics of dipole antenna modulation by sub-wavelength inhomogeneous plasma layer

AIP Advances ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 025014 ◽  
Author(s):  
Fanrong Kong ◽  
Peiqi Chen ◽  
Qiuyue Nie ◽  
Xiaoning Zhang ◽  
Zhen Zhang ◽  
...  
Keyword(s):  
Plasma Layer ◽  
Inhomogeneous Plasma ◽  
Dipole Antenna ◽  
Radiation Characteristics ◽  
Sub Wavelength
Sign in / Sign up

Export Citation Format

Share Document