| 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 S 11 represents the saturation magnetization of said garnet type ferrite material at a temperature T 1, S 12 represents one at a temperature T 2, and S 13 represents one at a temperature T 3; and S 21 represents the saturation magnetization of said permanent magnet at a temperature T 1, S 22 represents one at a temperature T 2, and S 23 represents one at a temperature T 3, where T 1< T 2< T 3, and the saturation magnetizations S 11, S 12, S 13, S 21, S 22 and S 23 are relative values providing that the saturation magnetizations at the temperature T 2 is 1, and wherein the relations <?in-line-formulae description="In-line Formulae" end="lead"?>|(S 12- S 11 )/(T 2- T 1 )|<|(S 22- S 21 )/(T 2- T 1 )| and<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>|(S 13- S 12 )/(T 3- T 2 )|>|(S 23- S 22 )/(T 3- T 2 )| are satisfied.<?in-line-formulae description="In-line Formulae" end="tail"?>
|
