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The technique of impedance and admittance matrices allows a simple and elegant solution of the problem of radiation from antennae of arbitrary shape and orientation in plane stratified geometry. The medium towards which the antenna radiates is completely characterised by the values of these matrices at its surface. In vacuum, the wave admittance and impedance matrices obey simple transformation rules, which are used to solve the matching problem for arbitrary source currents. Combined with the variational approach originally developed for fast wave launching, this method allows the determination of the self-consistent current distribution in the antenna, its radiation resistance and its reactive impedance. The flexibility of the approach is illustrated by several examples both with and without plasma loading. They include a discussion of the characteristics of the folded antenna to be used for fast wave ICR heating in the ASDEX Upgrade tokamak, and of T-antennae for launching ion Bernstein waves near the first ion cyclotron harmonic.

Additional information

Authors: BRAMBILLA M, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 5/45 EN (1992) 50 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 199310038 / Last updated on: 1994-11-29
Original language: en
Available languages: en