Band-stop filter based on magnetostatic surface waves, exciting by symmetric coplanar line

An excitation of magnetostatic surface waves (MSSW) by symmetric coplanar transmission line was considered for the case, when coplanar line is placed at some distance from the ferrite film surface. The dependence of coplanar line impedance on the spacing between the line and ferrite film has been studied for design of band-stop filter. Approximate theoretical method of band-stop filter design is presented. Experimental frequency responses of band-stop filter which utilize a yttrium-iron-garnet (YIG) films with different thickness are presented and compared. Frequency dependences of coplanar line radiation resistance and insertion losses of band-stop filter are discussed.