Application of ferromagnetic composite in different planar tunable microwave devices

In this paper, several microwave det,ices using a ferromagnetic composite d emonstrate great tunability under weak magnetizing field conditions. Indeed , a tunable bandstop of 50% tunability and phase shifters of 35 degrees /dB figure of merit around 3 GHz and 78 degrees /dB in the X-band are obtained when a 250 Oe dc magnetic field is applied. Moreover, a magnetic switch ne ar 25 dB isolation and less than 1 dB insertion losses is realized. (C) 200 1 John Wiley & Sons, Inc.