Active surface wave devices in the microwave range on a stratified film structure of YIG semiconductors

The utilization of magnetostatic surface waves (MSSW) makes it possible to manufacture miniaturized passive and active surface devices for the microwave range. It is shown that magnetostatic and acoustic waves complement each other with respect to their range of applications. Possibilities for the utilization of magnetostatic surface waves are discussed, taking into account a delay line, filters, and a planar antenna array. The amplification of magnetostatic surface waves is considered, and a description is given of approaches for calculating the amplification provided by active surface wave devices. The maximum amplification theoretically obtainable for a stratified YIG-GaAs device in the S band is illustrated with the aid of a graph, taking into account various film thicknesses. Experimental studies concerning the amplification of magnetostatic surface waves are also conducted.