Radiation from Open-ended Coaxial Line in Warm Plasma Column Having Central Conductor along Its Axis

Abstract

The radiation pattern of an open-ended coaxial line excited in the TEM mode in the warm plasma column having central conductor along its axis is studied. The field. Distribution at the open end cross-section of the coaxial line is assumed to be equivalent to the vector sum of magnetic current rings of various radii, ranging from the outer radius of the inner conductor to the inner radius of the outer conductor of the coaxial line at the open end. The radiation field is obtained as a vector sum of field components due to individual rings of magnetic current. It is found that the resulting radiation pattern of the open-ended coaxial line is greatly influenced by the warm plasma nature of the plasma medium and hydrodynamic admittance boundary conditions.