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An approximate theoretical study of a sandwich-wire antenna is presented. The two outer conductors are in parallel and the center conductor is bent into triangular form with a period equal to the wavelength. The attenuation constant is obtained. The radiation pattern of an array consisting of a number of sandwich-wire antennas is evaluated. The theoretical results are compared with the existing experimental data.

The electrical conductivity of a fully ionized gas is analyzed based on the Fokker-Planck equation. It is found to have nonlinear characteristics if the impressed electric field is not restricted to be very small. The electrical conductivity of both dc and ac cases is investigated and the critical conditions are discussed. A convenient way of obtaining an approximate conductivity is also presented.

The interaction of a high-intensity EM field with a low-density plasma, including a collisionless plasma and a weakly ionized gas, is considered. The electron velocity distribution function is obtained exactly from a Boltzmann equation in each case without making any small perturbation approximation. The electron velocity distribution function obtained gives rise to significant results for some plasma parameters as functions of the intensity of EM field. It is also shown that conventional results for the small field case can be obtained from the results presented in this paper.