Dielectric properties of strontium hexaferrite in microwave, infrared and far infrared ranges

Presents the dielectric properties of polycrystalline SrF/sub 12/O/sub 19/ in the microwave range and far infrared range. Samples were made from powder pressed in a magnetic field and sintered in air at 1200 degrees C. The experimental results and numerically calculated dielectric permittivity in the far infrared range show that the dielectric permittivity holds a microwave value and in mm-wave range. The transmission characteristics of a thick film Sr- hexaferrite isolator in fin line technique were observed in the range 32.7-39.2 GHz. The bandwidth over which the isolation loss is greater than 20 dB is about 2 GHz (at around 36 GHz). Ferrite devices in this geometry have the advantage of being compact and of low cost compared to the ferrite devices in conventional structures.