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Resonant energy absorption in the ion sheath of a plate antenna
Author(s) -
Weenink M. P. H.
Publication year - 1982
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/rs017i002p00411
Subject(s) - antenna (radio) , plasma , admittance , physics , atomic physics , optics , debye sheath , radiation , absorption (acoustics) , materials science , electrical impedance , electrical engineering , quantum mechanics , engineering
In this paper we consider an antenna consisting of an infinite plane metallic plate divided into two half planes by an infinitely narrow slit across which an alternating electric field of frequency ω is applied. The antenna is immersed in a cold nonmagnetized plasma. Between the homogeneous plasma and the antenna surface an ion sheath is assumed to be present. The fields are calculated for a given density profile of the electrons by a small signal theory. The electromagnetic energy radiated from the slit is determined for frequencies below the plasma frequency. It is shown that the radiated energy is completely absorbed in the sheath. The radiation admittance is calculated as a function of frequency, the sheath thickness, and the plasma density.