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

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

2389

Lastpage

2391

Abstract

MMIC circulators operating at K_A-band have been fabricated from single crystal and polycrystalline hexaferrite platelets integrated into glass-microwave integrated circuit wafers. Measurements on circulators utilizing single crystal BaFe_11.1Sc_0.9O₁₉ showed two-band circulation, below-FMR (at 36 GHz) and above-FMR (at 24 GHz), while those using single crystal BaFe₁₂O₁₉ 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 BaFe_11.1Sc_0.9O₁₉ 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; BaFe_11.1Sc_0.9O₁₉; BaFe₁₂O₁₉; K_A-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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.951181

Filename

951181