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Highly oriented W-type hexaferrites SrNi 2 Sc x Fe 16-x O 27 (SrW, x = 0.70, 0.75, 0.80 and 0.85) are fabricated via ceramic process and magnetic orientation to meet design requirements of self-biased circulators. The orientation degree reaches 0.81 when Sc3+ substitution content x is 0.75. The XRD refinement results in consideration of orientation illustrate the strong c -axis anisotropy texture of SrW. SEM images show significant uniformity in grain growth with c -axis stays vertical to sample plane. Consequently, the corresponding remanence ratio M r /M s reaches as high as 0.92, which is indispensable to reduce low field loss (LFL) as much as possible in the design of self-biased circulators. According to simulation results, the self-biased microstrip circulator based on this SrW material (x = 0.75) realizes ideal functions in circular transmission operating at Ku band. [ABSTRACT FROM AUTHOR]