Current Distribution and Input Impedance of a Strip Loop Antenna Located on the Surface of a Circular Column Filled With a Resonant Magnetoplasma

Abstract

Abstract-We study the electrodynamic characteristics of a strip loop antenna located on the surface of a circular column filled with a resonant magnetoplasma and surrounded by a homogeneous isotropic background medium. The antenna current is excited by a time-harmonic voltage creating an electric field with the azimuthal component in a narrow gap on the strip surface. It is shown that the current distribution and input impedance of such an antenna are strongly influenced by the presence of an infinite number of propagating quasielectrostatic modes that are guided by a column containing a resonant magnetoplasma.

Comparison of integral equation and transmission line methods for analysis of a loop antenna located on the surface of an axially magnetized plasma column

“…This is in particular explained by the fact that in the above-mentioned cases, the problem of finding the current distribution of the antenna is mathematically tractable and can be solved using an integral equation method. For a loop antenna operated on the surface of an axially magnetized plasma column in a background isotropic medium, the basic solution has recently been published in [3,4]. In the present work, we will compare the results of our calculations of the antenna characteristics obtained using the integral equation method [3,4] with the results of some simpler approximate approaches such as the transmission line theory.…”

“…For a loop antenna operated on the surface of an axially magnetized plasma column in a background isotropic medium, the basic solution has recently been published in [3,4]. In the present work, we will compare the results of our calculations of the antenna characteristics obtained using the integral equation method [3,4] with the results of some simpler approximate approaches such as the transmission line theory. The main attention will be paid to the case where the plasma medium inside the column is resonant.…”

“…Much previous work on studying the electrodynamic characteristics of loop antennas in magnetized plasmas either applies to antennas immersed in an unbounded homogeneous magnetoplasma (see, e.g., [1,2] and references therein) or to the case where such a source is located on the surface of an axially magnetized plasma column surrounded by a homogeneous isotropic medium [3,4]. This is in particular explained by the fact that in the above-mentioned cases, the problem of finding the current distribution of the antenna is mathematically tractable and can be solved using an integral equation method.…”

Electrodynamic Characteristics of a Strip Antenna Located on a Plane Interface of a Resonant Magnetoplasma and an Isotropic Medium

“…Most of the theoretical papers on the subject consider the antennas located in a homogeneous magnetoplasma (see, e. g., [5][6][7][8]). Recently, increased attention has been paid to the study of antenna characteristics in inhomogeneous plasma media [4,[9][10][11]. The case where the antenna is located near the interface of two media (in particular, isotropic and magnetized) is of the greatest interest since the presence of such an interface can significantly affect the current distribution and power characteristics of the sources.…”

Scattering of an Obliquely Incident Plane Electromagnetic Wave by a Magnetized Plasma Column: Energy Flow Patterns at Plasmon Resonances

“…In the optical range, this interest is stimulated by promising applications of systems with nanosized gyrotropic elements [2], photonic crystals on the basis of gyrotropic scatterers [3], and nonreciprocal devices containing magnetooptic materials [4,5]. In the RF range, the corresponding analysis is needed for consideration of the excitation and propagation of electromagnetic waves in the presence of artificial plasma density irregularities aligned with an external static magnetic field [6], especially if the excitation source is located outside such a plasma structure, rather than inside of it [7] or on its surface [8]. Since the understanding of the features of wave diffraction by gyrotropic cylindrical structures often requires knowledge of the field distribution near scatterers, the problem of finding the near-zone scattered fields turns out to be very topical.…”