Impedance of an Insulated Linear Antenna Between Layers of Compressible Plasma

Abstract

A flat strip antenna is embedded in a planar dielectric slab, which is surrounded on both sides by layers of compressible isotropic electron plasma. Several closed-form expressions are obtained for the impedance with a sinusoidal current distribution along the antenna. The antenna il)lpedance is computed numerically when considering the perturbations of the antenna current by surface waves. Except for thin plasma layers, the antenna impedance can be computed using the same current dis· tribution as for a cold plasma. This supports the validity of earlier work which neglects the per· turbation of the antenna current by plasma waves. However, it is essential to consider the finite transverse dimension of the antenna and ~he presence of an insulating layer or of an ion sheath.

Effects of Induced Acoustic Sources on the Impedance of a Cylindrical Dipole in a Warm Plasma

“…Seshadri (1965d) and Galejs (1965) have investigated the propagation constants for the CUf!ent distribution along an infinitely long cylinder in a warm plasma and found it to contain terms identifiable with EM and acoustic waves. Galejs (1966b) also considered a linear antenna in a stratified warm plasma and the effect of surface waves on impedance.…”