Effect of ionized plasma medium on the radiation from a RITMA structure on ferrite substrate

摘要

This paper presents theoretical investigations on the radiation properties of a right isosceles triangular microstrip antenna (RITMA) printed on a magnetized ferrite substrate Ni_0.62Co_0.02Fe_1.948O₄ in the presence of ionized plasma medium. The theoretical study on RITMA structure in free space is carried out in TM₁₁ mode of excitation by applying cavity model-based modal expansion technique while hydrodynamic theory is used for its analysis in plasma medium. By varying the bias magnetic field, far-field radiation patterns in free space and plasma medium are obtained which in turn are applied in computing radiated power, directivity, quality factor and bandwidth of antenna. It is found that the presence of plasma medium affects the performance of RITMA structure significantly Keywords Microstrip antenna - plasma medium - hydrodynamic theory PACS Nos 52.40.Fd - 84.40.Ba - 75.50.Gg Article presented at the International Conference on the Frontiers of Plasma Physics and Technology, 9–14 December 2002, Bangalore, India.