VHF current distribution on a cylindrical VLF antenna in a magnetoplasma

We obtain, solution for the current distribution on a linear antenna excited by a given e.m.f. The antenna is an infinitely, long, perfectly conducting cylinder immersed in a plasma and aligned with an external magnetic field. The obtained current distribution in the VLF band is contributed by the eigenmode guided by the cylinder and waves of the continuous spatial spectrum. We show that the current distribution of a sufficiently thin antenna is determined mainly by the eigenmode. The antenna current is calculated both analytically and numerically under ionospheric conditions. The validity criteria for using the transmission-line theory to obtain the current distribution on a linear antenna in a magnetoplasma are discussed. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 42, No. 8, pp. 750–764, August 1999.     

Electromagnetic-Wave Propagation in a Half-Space with a Curvilinear Impedance Boundary

We study propagation of electromagnetic waves in a vacuum half-space with a one-dimensional distortion of the impedance boundary whose profile is smooth on the wavelength scale. We suggest a method allowing one to obtain the solution of this problem on the basis of a more simple boundary-value problem with the same geometry of the boundary, but with a zero Dirichlet boundary condition.     

Use of Carbon-Based Composite Materials with Anisotropic Conductivity for Creating Microwave Antennas

Radiophysics and Quantum Electronics - We develop and test engineering solutions aimed at creating antenna devices made of carbonbased composite materials and operated in various intervals of the...     

Nonsymmetric Whistler Waves Guided by Cylindrical Ducts with Enhanced Plasma Density

We study the guided propagation of whistler waves whose fields depend on the azimuthal angle in cylindrical plasma-waveguide channels (density ducts) aligned with an external magnetic field and surrounded by a uniform magnetoplasma. The main attention is paid to ducts with enhanced plasma density. It is shown that, under certain conditions, such ducts are capable of guiding proper (eigen) modes and improper leaky modes. We present the results of analysis of the dispersion properties and field structures of nonsymmetric modes guided by cylindrical ducts in the whistler frequency range.     

Magnetic instability in an inhomogeneous plasma in an intense electromagnetic wave

Radiophysics Research Institute. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 33, No. 2, pp. 170–176, February, 1990.     

Excitation of Nonsymmetric Waves by Given Sources in a Magnetoplasma in the Presence of a Cylindrical Plasma Channel

We consider the problem of excitation of electromagnetic field by spatially bounded, arbitrary given sources in a magnetoplasma in the presence of a cylindrical plasma channel aligned with an external magnetic field. We obtain a rigorous solution for the total field comprising both the discrete and continuous parts of the spatial spectrum of excited waves. Expressions for the radiation pattern and total radiation power of given sources are analyzed. For the whistler range, we calculate the radiation power of a ring electric current located in a channel with enhanced plasma density. It is shown that in this range, the presence of such a channel can lead to a significant increase in the radiation power of ring currents as compared with the case where the considered sources are immersed in a uniform background magnetoplasma, regardless of their orientation.