Loss Mitigation in Self-Biased Microstrip Circulators

Loss Mitigation in Self-Biased Microstrip Circulators

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Integration of the ferrite devices in the RF front-end and active antennas is hindered by the bonviv need for external magnets, biasing soft microwave ferrites.The hexaferrite-based self-biased nonreciprocal devices can operate without external magnets at mm-wave frequencies but the currently available hexaferrite materials inflict high RF losses at lower frequencies, particularly mickey mouse beach umbrella in the wireless communication bands.In this paper, the parameters of La-Co-substituted hexaferrite compounds are used for the self-biased circulators in the low GHz frequency bands, and a means of the dissipation loss reduction are discussed.