WAVE PROPERTIES OF A CYLINDRICAL-ANTENNA IMMERSED IN A MAGNETO-ACTIVEPLASMA

The dispersion properties and electromagnetic field topography of surf ace waves propagating along and in the azimuthal direction with respec t to a cylindrical metal antenna immersed in a magneto-active plasma a re investigated. The external magnetic field is directed along the ant enna axis. The presence of a vacuum-gap sheath region separating the a ntenna from the plasma is assumed. The sheathless case is also conside red. The dependence of the surface-wave dispersion properties on magne tic field intensity, plasma density, antenna radius and sheath thickne ss is presented-for structure parameters close to experimental data. T he results show qualitative agreement between our theory and experimen t. The antenna surface impedance is calculated as well.