| 摘要 |
A technique for improving a circulator element for its temperature characteristic is provided. A circulator element including a garnet type ferrite material, and a permanent magnet for applying a direct-current magnetic field to the garnet type ferrite material, wherein S11 represents the saturation magnetization of said garnet type ferrite material at a temperature T1, S12 represents one at a temperature T2, and S13 represents one at a temperature T3; and S21 represents the saturation magnetization of said permanent magnet at a temperature T1, S22 represents one at a temperature T2, and S23 represents one at a temperature T3, where T1<=T2<=T3, and the saturation magnetizations S11, S12, S13, S21, S22 and S23 are relative values providing that the saturation magnetizations at the temperature T2 is 1, and wherein the relations <?in-line-formulae description="In-line Formulae" end="lead"?>|(S12-S11)/(T2-T1)|<|(S22-S21)/(T2-T1)| and <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>|(S13-S12)/(T3-T2)|>|(S23-S22)/(T3-T2)| are satisfied. <?in-line-formulae description="In-line Formulae" end="tail"?>
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