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Impedance of an Insulated Linear Antenna Between Layers of Compressible Plasma
Author(s) -
Galejs Janis
Publication year - 1966
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/rds1966191057
Subject(s) - antenna (radio) , loop antenna , physics , antenna factor , antenna measurement , coaxial antenna , acoustics , materials science , optics , dipole antenna , electrical engineering , engineering
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 impedance 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 distribution as for a cold plasma. This supports the validity of earlier work which neglects the perturbation of the antenna current by plasma waves. However, it is essential to consider the finite transverse dimension of the antenna and the presence of an insulating layer or of an ion sheath.