A Study of Centre-fed Antiphase Circular Antennas in a Warm Plasma

Abstract

The radiation characteristics of a centre-fed antiphase circular arc antenna immersed in a warm electron plasma are studied using linearized hydrodynamic theory. The effects of antenna and plasma parameters on the radiation properties have been studied by computing the results and presenting them graphically. It is found that, whereas the power radiated in the TEM mode depends on the length as well as on the angle of the arc antenna, the power in the LP mode is independent of the angle and depends only on the length of the arc. It is also found that the power in the LP mode is relatively much larger in the case of small angled centre-fed antiphase arc antennas. Hence small angled arcs should be suitable for the launching of plasma waves, whereas large angled arcs will be more useful for communication through a plasma medium.