Polarized Switchable Microstrip Array Antenna Printed on LiTi Ferrite

Abstract

Radiation characteristics of a polarized switchable microstrip planar array of circular patch antenna printed on synthesized LiTi ferrite substrate with a normal magnetic bias field are analysed. Normaly upto X-band, the em-waves propagation is studied by the Pozar’s quasi TEM waves (extraordinary waves) but for the study in Xband spin wave exchange term (ωr) in the magnetostatic wave analysis is also incorporated which depends upon the static internal field (Hex). The substituted polycrystalline ferrite with DC magnetic biasing is offers number of novel magnetic and electrical characteristics including switchable and polarized radiations from a microstrip antenna. In such a case of antenna radiation, most of the power will be converted into mechanical waves and little radiates into air. Under such condition the antenna become switch off, in the sense of effectively absence as radiator.