Author: Chia-chuen HungPublisher:
ISBN:
Category :
Languages : en
Pages : 288
Book Description
The Effect of Sheath on the Radiation of a Dipole Antenna in a Magnetized Plasma
Author: Chia-chuen HungScientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 970
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Electromagnetic Radiation Through a Cold Cylindrical Plasma Sheath with an Axial Static Magnetic Field
Author: Cavour W. H. YehPublisher:
ISBN:
Category : Electromagnetic waves
Languages : en
Pages : 23
Book Description
The expressions for the radiated fields of an arbitrary slot on a conducting cylinder coated with a cold plasma sheath with an axial static magnetic field are obtained. It is well-known from the plane wave analysis that the presence of a static magnetic field affects considerably the transmission characteristics of the signal through the plasma sheath. The principal concern of this paper is to consider the effects of a static magnetic field on the radiation of a plasma coated slot antenna. Extensive numerical computations are carried out for the special case of an infinite axial slot. It is found that if the plasma frequency is moderate a small axial static magnetic field could change significantly the radiation patterns of the slotted antenna. Furthermore, the radiation patterns are asymmetric. (Author).
The Radiation Field of a Magnetic Dipole Antenna in a Conical Sheath
Author: D. C. Pridmore-BrownPublisher:
ISBN:
Category :
Languages : en
Pages : 45
Book Description
The radiation pattern of a magnetic dipole antenna that is situated on the axis of a cone of finite conductivity, such as a conical plasma sheath, has been calculated. The analysis makes use of Greens functions in terms of which an integral equation is set up for the induced current distribution in the conical sheath. This integral equation is then solved by a perturbation technique that is based upon the assumption that the sheath is highly reflecting. Finally, the current distribution calculated in this way is used as a source to obtain the farfield radiation pattern. In the case of a 10 degree cone and a wavelength of 2pi times the distance between the antenna and the apex, this pattern exhibits lobes at 60 and 130 degrees from the conical axis. (Author).
Plasma Sheaths and Their Effects on Antennas
Author: Stanton Jerrold PealePublisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 154
Book Description
In recent years there has been a growing interest in general plasma physics. Communications over long distances are affected by plasma clouds and any magnetic fields they contain. While radio sounding is currently used to explore the ionosphere, investigation of plasmas located at points far beyond the ionosphere demands that environmental sampling techniques be developed to produce reliable knowledge.
Dipole Radiation in Compressible Plasma
Author: Sin-hsiung LinJournal of Research, National Bureau of Standards
Author: United States. National Bureau of StandardsPublisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 1400
Book Description
On The Antenna Radiation Through A Plasma Sheath
Author: A. Olte and Y. HayashiPublisher:
ISBN:
Category :
Languages : en
Pages : 106
Book Description
Journal of Research
Author: United States. National Bureau of StandardsPublisher:
ISBN:
Category : Radio
Languages : en
Pages : 816
Book Description
The Effect on the Radiation from a Plasma Sheath of a Unidirectional Surface Wave Along a Perfectly Conducting Plane
Author: Akira IshimaruPublisher:
ISBN:
Category : Electromagnetic surface waves
Languages : en
Pages : 26
Book Description
When an anisotropic plasma is bounded by conducting plane, a trapped surface wave can exist which propagates in a direction perpendicular to the dc magnetic field. When the plasma slab of finite thickness is placed over a conducting plane and excited by a magnetic line source which is in parallel with the dc magnetic field, this surface wave produces unidirectional leaky-wave pole, and in a certain frequency range this leaky wave pole is very close to a saddle point. The radiation pattern which results from the saddle point evaluation has a very sharp peak and the angle of this main beam can be varied as the dc magnetic field or plasma frequency are varied. It is also interesting to note that this sharp beam exists even when a plasma is opaque. In fact a considerable amount of energy transmission through the opaque plasma is possible due to the effect of this particular leaky wave mode. (Author).