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Development of high frequency ferrite phase-shifter

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5 Author(s)
Zuo, Xu ; Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA ; How, H. ; Shi, Ping ; Oliver, S.A.
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A phase-shifter was fabricated on a c-texture Zn2Y (Zn 2Ba2Fe12O22) single crystal substrate, and tested over microwave frequencies from 2 to 35 GHz and for biasing magnetic fields from 0.2 to 5 kOe. The differential phase-shift rate was 90°/ at a microwave frequency of 20 GHz and a magnetic bias-field of 1.3 kOe. This device showed that it is possible to reduce the bias-field requirement efficiently and simply by utilizing the large in-plane anisotropy in Y-type hexaferrites and magnetostatic modes. A simple model based on the conjugate method for a TEM wave gave a reasonable match with the measured performance of the device, when the uniaxial magnetic anisotropy and magnetostatic modes were included

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