THE EFFECTS OF COVERING ON COMPLEX WAVE-PROPAGATION IN GYROMAGNETIC SLOTLINES

The evolution of complex leaky waves in partially open gyromagnetic sl otlines into complex modes in a shielded slotline is presented, Given a particular stratified gyromagnetic slotline with two sidewalls prese nt, four types (Types I-TV) of guided structures are defined and inves tigated, depending upon the four possible combinations of top and bott om covers, The behavior of the complex solutions is discussed for the partially open gyromagnetic slotlines, Initially, the slotline of Type I, which lacks both top and bottom covers, shows that no coupling exi sts among various pairs of leaky waves, By adding only a top cover int o Type I, the resultant slotline of Type II exhibits certain coupling between different sets of leaky waves, Similarly, by adding only a bot tom cover into Type I, the resultant slotline of Type III shows that c ertain strong leaky waves of Types I and II now become weak leaky wave s, From these numerical experiments, we deduce that the complex modes supported by Type IV, which is completely shielded, can be the result of the mode coupling of the two previously found leaky waves in Types II and IlI waveguides, respectively, Therefore, the formation of compl ex modes in Shielded slotline is related to the effects of covering on mode coupling of the various leaky waves of the partially open slotli nes.