Self-Biased Y-Junction Circulators Using Lanthanum- and Cobalt-Substituted Strontium Hexaferrites


In this paper, we have a tendency to propose the applying of polycrystalline lanthanum- and cobalt-substituted strontium hexaferrites in the realization of self-biased circulators. These materials gift a high anisotropy field, passionate about the substitution rate, that makes it potential to reach operating frequencies within the millimeter-wave range. A 1st demonstrator was successfully designed and realized using a twentyp.c rate of substitution $(hbox Sr_0.8hbox La_0.2hbox Fe_11.8hbox Co_0.2hbox O_19)$ . This circulator showed insertion losses of one.seventy nine dB and an isolation level of twenty dB at 41.4 GHz without magnets. Performances can be considerably improved by applying a low magnetic field $(hbox H_rm app=2100 hbox Oe)$. Consistent with the literature, increasing the substitution rate makes it possible to increase the anisotropy field, and so, the inner field. Consequently, a thirtypercent substituted strontium hexaferrite was tested. It seems that the anisotropy field was not higher in this case. However, magnetic losses are a lot of lower and enabled us to halve insertion losses of the self-biased circulator (zero.eighty seven dB at forty one GHz).

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