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Loaded two‐element ring antenna for electron plasma waves
Author(s) -
Morita Y.,
Egashira S.,
Honjoh M.
Publication year - 1989
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 - 10.1029/rs024i005p00619
Subject(s) - antenna (radio) , physics , boundary element method , optics , plasma , radiation pattern , electron , acoustics , finite element method , electrical engineering , engineering , quantum mechanics , thermodynamics
A short, coil‐loaded two‐element ring antenna including a transmission line, immersed in a warm, isotropic plasma, is investigated as a boundary value problem in the frequency range where electron plasma waves exist. The wave potential of electron plasma waves launched from a two‐element ring antenna has been enhanced by a factor of 4–6 in comparison with the case of an unloaded one‐element ring antenna, when a suitable inductive load is inserted at the feeding point of element 2, and the distance between element 1 and element 2 is chosen as an optimum element spacing. Theory is substantiated by the experiments. In addition, the unidirectional radiation patterns of the antenna for electron plasma waves are predicted by the present theory.