Barium Ferrite Materials for Microwave Circulators

Barium ferrite thick disks have been fabricated for incorporation in self-biased microwave devices. The process uses barium ferrite nanopowder mixed with epoxy. The mix is placed on alumina substrates to fabricate 500 μm thick disks of BaM to achieve good magnetic properties such as magnetic saturations from 2,000 to 2,500 G and coercivities fom 3800 to 4000 Oe. In addition, the barium ferrite thick disks have been incorporated into microwave devices and successfully deposited into copper contact lines for testing and use.