Microwave pulse compression using magnetostatic spin waves in YIG rods

A microwave pulse compression filter has been obtained atS-band and room temperature by using the dispersive characteristics of propagating magnetostatic spin waves in single crystal rods of yttrium iron garnet (YIG). The maximum pulse compression ratio was 60 but higher values should be possible with faster sweep rates and more precise sweep matching than could be obtained with the equipment employed. The maximum input pulse width that could be effectively used was about 2 μs which seems to be a natural limit of the material due to increased attenuation for longer time delays. The overall insertion loss that can be obtained using magnetostatic waves is less than that using the magnetoelastic mode of propagation.