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1 1998

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Structure and magnetic properties of polycrystalline YIG garnets and circulator design in microwave frequencies

Park J. R., Kim T. H., Choy T. G.

Electron Technology

1998

Vol. 31, No. 1

114-119

Yttrium Iron Garnet (YIG) ceramics are isolators, circulators, phase shifters, etc. in high frequency telecommunication systems. In this paper the effect of Al₂O₃ substitution on the micro-stucture and the magnetic properties of YIG with Ca, Sn substitutions were studied. The specimen was prepared with convenational ceramic method and analyzed using scanning electron microscopy, X-ray diffractometry, magnetometry and ferrimagnetic resonance experiments. The effect of Al₂O₃ substitution on the permittivity and permeability of YIG with Ca, Sn substitutions was measured using the cavity perturbation method in microwave frequencies. The YIG specimen with 1.2 mol% Al₂O₃ was sintered at 1450°C. It showed ferrimagnetic resonance linewidth ∆H of 42 Oe and saturation magnetization 487 G. The measured permittivity and permeability in the microwave range were 15.623 and 0.972, respectively. The fabricated strip-line junction circulatior using the above YIG ceramics had the insertion loss of 0.406 dB, return loss of 19.272 dB and isolation of 17.848 dB at the center frequency of 1.855 GHz.