Impedance of a short dipole antenna in a cold plasma

Author

Nikitin, Pavel ; Swenson, Charles

Author_Institution

Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

49

Issue

10

fYear

2001

fDate

10/1/2001 12:00:00 AM

Firstpage

1377

Lastpage

1381

Abstract

This paper presents the analysis of the impedance of a short dipole antenna in a cold plasma using a quasi-static approach. Two radically different current distributions on the antenna are considered and their influences on the antenna impedance are studied. These distributions include a one-dimensional (1-D) triangular distribution and a three-dimensional (3-D) exponential current distribution. Balmain (1964) analytically solved the first problem. Staras (1964) proposed the second one. In this paper, we offer an analytical solution for the second one as proposed by Staras. We compare both distributions and find that impedances resulting from them are remarkably close. We conclude that the impedance of a short antenna, as derived using the quasi-static approximation, is insensitive to the choice of current distribution. Therefore, any of these two theories can be used when analyzing data from an impedance probe immersed in a space plasma

Keywords

antennas in plasma; current distribution; dipole antennas; electric impedance; 1D triangular distribution; 3D exponential current distribution; analytical solution; antenna impedance; cold plasma; current distribution; impedance probe; one-dimensional triangular distribution; quasi-static approach; quasi-static approximation; short dipole antenna; space plasma; three-dimensional exponential current distribution; Antennas and propagation; Current distribution; Data analysis; Dipole antennas; Magnetic field measurement; Plasma density; Plasma measurements; Plasma temperature; Probes; Surface impedance;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.954926

Filename

954926