Loss Mitigation in Self-Biased Microstrip Circulators

Integration of the ferrite devices in the RF front-end and active antennas is hindered by the need for external magnets, biasing soft microwave ferrites.The hexaferrite-based self-biased nonreciprocal devices can operate without external Rangehood Globe magnets at mm-wave frequencies but the currently available hexaferrite materials promotional-material inflict high RF losses at lower frequencies, particularly 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.