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MMIC circulators using hexaferrites

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6 Author(s)
Shi, Ping ; Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA ; How, H. ; Zuo, Xu ; Yoon, S.D.
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MMIC circulators operating at KA-band have been fabricated from single crystal and polycrystalline hexaferrite platelets integrated into glass-microwave integrated circuit wafers. Measurements on circulators utilizing single crystal BaFe11.1Sc0.9 O19 showed two-band circulation, below-FMR (at 36 GHz) and above-FMR (at 24 GHz), while those using single crystal BaFe12 O19 showed above-FMR circulation at 32-35 GHz. Self-biased circulators using SrFe12O19 ceramics showed above-FMR circulation at 32 GHz. All circulators showed reasonable insertion losses and isolation, with the best insertion loss of 1.2 dB at an isolation of 18 dB being found for a BaFe11.1Sc0.9O19 circulator operating below-FMR

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )