The effects of electron temperature on the radiation fieldsand the resistance of a short dipole antenna embedded in a uniaxialplasma have been studied. It is found that for ω < ω_p the antenna excites two waves, a slow wave and a fast wave. These waves propagateonly within a cone whose axis is parallel to the biasing magnetostaticfield B_o and whose semicone angle is slightly less than sin ^(-1) (ω/ω_p).In the case of ω > ω_p the antenna excites two separate modes of radiation. One of the modes is the electromagnetic mode, while theother mode is of hot plasma origin. A characteristic interferencestructure is noted in the angular distribution of the field. The farfields are evaluated by asymptotic methods, while the near fields arecalculated numerically. The effects of antenna length ℓ, electronthermal speed, collisional and Landau damping on the near field patternshave been studied.
The input and the radiation resistances are calculated and areshown to remain finite for nonzero electron thermal velocities. Theeffect of Landau damping and the antenna length on the input andradiation resistances has been considered.
The radiation condition for solving Maxwell's equations isdiscussed and the phase and group velocities for propagation given.It is found that for ω < ω_p in the radial direction (cylindrical coordinates) the power flow is in the opposite direction to that of the phase propagation. For ω > ω_p the hot plasma mode has similar characteristics.
