1. Application of ferromagnetic composite in different planar tunable microwave devices. Author Salahun, E., Tanné, G., Quéffélec, P., LeFloc'h, M., Adenot, A. -L., and Acher, O. Subjects *MICROWAVE devices, *ELECTRIC filters, *ELECTRIC switchgear, *PHASE shifters, *ELECTRONIC equipment, *MAGNETIC fields Abstract In this paper, several microwave devices using a ferromagnetic composite demonstrate great tunability under weak magnetizing field conditions. Indeed, a tunable bandstop of 50% tunability and phase shifters of 35°/dB figure of merit around 3 GHz and 7.8°/dB in the X-band are obtained when a 250 Oe dc magnetic field is applied. Moreover, a magnetic switch near 25 dB isolation and less than 1 dB insertion losses is realized. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 272–276, 2001. [ABSTRACT FROM AUTHOR] Published 2001 Full Text View/download PDF