Trapped particle effect on the velocity of circularly polarized electromagnetic waves in an isotropic plasma

2010 ◽  
Vol 374 (15-16) ◽  
pp. 1751-1754 ◽  
Author(s):  
V.L. Krasovsky
Keyword(s):  
Electromagnetic Waves ◽  
Isotropic Plasma ◽  
Circularly Polarized ◽  
Particle Effect

scholarly journals Scattering of electromagnetic waves from a chiral coated nihility cylinder hosted by isotropic plasma medium

2015 ◽  
Vol 5 (5) ◽  
pp. 1224 ◽  
Author(s):  
M. Z. Yaqoob ◽  
A. Ghaffar ◽  
Majeed A.S. Alkanhal ◽  
I. Shakir ◽  
Q. A. Naqvi
Keyword(s):  
Electromagnetic Waves ◽  
Plasma Medium ◽  
Isotropic Plasma

Stochasticity in plasmas with electromagnetic waves

1982 ◽  
Vol 28 (3) ◽  
pp. 485-493 ◽  
Author(s):  
J. T. Mendonça ◽  
F. Doveil
Keyword(s):  
Wave Field ◽  
Laser Plasma ◽  
Electromagnetic Waves ◽  
Numerical Calculations ◽  
Isotropic Plasma ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Interaction Problem

The interaction of an electron with two electromagnetic waves propagating in an isotropic plasma is studied. It is shown, by numerical calculations, that the electron behaves stochastically, above a given threshold of the wave field amplitudes. The numerical threshold is compared with those given by analytical criteria. The results might be relevant to the laser-plasma interaction problem.

Whistler instability in plasmas with anisotropic and non-Maxwellian velocity distributions

1971 ◽  
Vol 6 (3) ◽  
pp. 449-456 ◽  
Author(s):  
Kai Fong Lee
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Maxwell Equations ◽  
Transverse Velocity ◽  
Distribution Functions ◽  
Loss Cone ◽  
Circularly Polarized ◽  
Electron Plasmas ◽  
Thermal Spread ◽  
The Magnetic Field

The instability of right-handed, circularly polarized electromagnetic waves, propagating along an external magnetic field (whistler mode), is studied for electron plasmas with distribution functions peaked at some non-zero value of the transverse velocity. Based on the linearized Vlasov-Maxwell equations, the criteria for instability are given both for non-resonant instabilities arising from distribution functions with no thermal spread parallel to the magnetic field, and for resonant instabilities arising from distribution functions with Maxwellian dependence in the parallel velocities. It is found that, in general, the higher the average perpendicular energy, the more is the plasma susceptible to the whistler instability. These criteria are then applied to a sharply peaked ring distribution, and to loss-cone distributions of the Dory, Guest & Harris (1965) type.

Double passage of electromagnetic waves through magnetized plasma: approximation of independent normal waves

Open Physics ◽  
2010 ◽  
Vol 8 (3) ◽  
Author(s):  
Yury Kravtsov ◽  
Bohdan Bieg
Keyword(s):  
Electromagnetic Wave ◽  
Characteristic Feature ◽  
Electromagnetic Waves ◽  
Polarization State ◽  
Normal Modes ◽  
Practical Interest ◽  
Magnetized Plasma ◽  
Fast Wave ◽  
Circularly Polarized ◽  
Normal Waves

AbstractPolarization properties of electromagnetic waves, double-passed through magnetized plasma, are studied. Analyses are performed in the case of non-interacting normal modes, propagating in homogeneous and weakly inhomogeneous plasmas, and for three kinds of reflectors: metallic plane, 2D corner retro-reflector (2D-CR), and cubic corner retro-reflector (CCR). It is shown that an electromagnetic wave, reflected from a metallic plane and from a CCR, contains only “velocity-preserving” channels, whose phases are doubled in comparison with those of a single-passage propagation. At the same time, an electromagnetic wave reflected from a 2D-CR is shown to contain both “velocity-preserving” and “velocity-converting” channels, the latter converting the fast wave into the slow one and vice-versa. One characteristic feature of “velocity-converting” channels is that they reproduce the initial polarization state near the source, which might be of practical interest for plasma interferometry. In the case of circularly polarized modes, “velocity-preserving” channels completely disappear, and only “velocity-converting” channels are to be found.

scholarly journals WAVEGUIDE FEED NETWORK FOR HORN ANTENNA WITH CIRCULAR POLARIZATION

2021 ◽  
Author(s):  
Stepan Piltyay
Keyword(s):  
Circular Polarization ◽  
Electromagnetic Waves ◽  
Metal Structure ◽  
Horn Antenna ◽  
Variable Cross ◽  
Circularly Polarized ◽  
Maximum Gain ◽  
Left Hand ◽  
Right Hand ◽  
Feed Network

The article presents the methodology for designing and optimizing of feed network for a circularly polarized horn antenna. A horn antenna has a metal structure and consists of a waveguide that has a variable cross-section and an open radiating end. Electromagnetic waves in such antenna are excited by a waveguide that is connected to a horn antenna in through the narrow wall. The proposed feed network of the horn antenna consists of a rectangular waveguide with a slot. In order to obtain the excitation of signals with circular polarization at the output, a slot was cut in the waveguide at an angle of 45º. As a result, the network makes it possible to form the signals with right-hand circular polarization and left-hand circular polarization. The presented design of the horn antenna feed network eliminates the need to develop a separate waveguide device of polarization processing. The designed feed network of the circularly polarized horn antenna can be used at an operating frequency of 8.0 GHz. At these frequency the reflection coefficient is less than −19 dB. The proposed horn antenna provides a maximum gain of 21 dB for right-hand circular polarization and a maximum gain of 10 dB for left-hand circular polarization. Cross-polarization isolation is higher than 10 dB. Therefore, the developed feed network of the horn antenna provides narrowband operating mode at the circular polarization with satisfying electromagnetic polarization characteristics and matching at the frequency of 8 GHz. Developed feed network of the horn antenna with circular polarization can be used in radio engineering systems, which carry out polarization processing of signals.

scholarly journals Ultrathin Spin-Decoupled Meta-Devices for Independent Control of Electromagnetic Waves With Dual-Orthogonal Circular Polarization

2021 ◽  
Vol 8 ◽  
Author(s):  
Wenqiong Chen ◽  
Buxiong Qi ◽  
Jingwei Zhang ◽  
Tiaoming Niu ◽  
Zhonglei Mei
Keyword(s):  
Circular Polarization ◽  
Geometric Phase ◽  
Electromagnetic Waves ◽  
Layer Structure ◽  
Single Layer ◽  
Beam Deflection ◽  
Independent Control ◽  
Circularly Polarized ◽  
Beam Focusing ◽  
Polarized Waves

Inspired by the concept of miniaturized and integrated systems, an ultrathin and multifunctional metasurface device is highly desirable in microwave fields. It is an inherent characteristic that the two spin phase states of electromagnetic waves imparted by the geometric phase are always conjugate symmetric, i.e., the geometric phase produces anti-symmetrical phase responses between dual-orthogonal circular polarization states. So it is extremely crucial to break the conjugate constraints and realize the completely independent control of electromagnetic waves with dual-orthogonal circular polarization. Based on this perspective, ultrathin and bifunctional meta-devices operating in reflection mode are proposed to independently manipulate the left-handed and right-handed circularly polarized waves, which are constructed by anisotropic meta-atoms with synthetical geometric and propagation phases. It is worth noting that the component elements only need a single-layer structure with the thickness of 0.07λ0. Several design samples are presented to achieve functionalities of beam focusing, vortex wave generation, and beam deflection, respectively. Experiments are performed and show good consistence with the simulation results, successfully verifying the performance of the designed metasurfaces. The research results in this paper pave the way to design low-profile and bifunctional devices with independent controls of circularly polarized waves, which is expected to expand the working capacity of metasurfaces to realize complex electromagnetic wave manipulation with a new degree of freedom.

Sign in / Sign up

Export Citation Format

Share Document