Title :
MMIC circulators using hexaferrites
Author :
Shi, Ping ; How, H. ; Zuo, Xu ; Yoon, S.D. ; Oliver, S.A. ; Vittoria, C.
Author_Institution :
Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA
fDate :
7/1/2001 12:00:00 AM
Abstract :
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
Keywords :
MMIC; barium compounds; ferrite circulators; losses; magnetic microwave devices; microwave circulators; strontium compounds; 1.2 dB; 24 to 36 GHz; BaFe11.1Sc0.9O19; BaFe12O19; KA-band; MMIC circulators; SrFe12O19; above-FMR circulation; below-FMR circulation; glass-microwave integrated circuit wafers; insertion losses; isolation; polycrystalline hexaferrite platelets; self-biased circulators; Anisotropic magnetoresistance; Barium; Ceramics; Circulators; Crystalline materials; Ferrites; Frequency; MMICs; Magnetic materials; Microwave devices;
Journal_Title :
Magnetics, IEEE Transactions on
