Abstract: 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 |(S12?S11)/(T2?T1)|<|(S22?S21)/(T2?T1)| and |(S13?S12)/(T3?T2)|>|(S23?S22)/(T3?T2)| are satisfied.

Abstract: 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 |(S12?S11)/(T2?T1)|<|(S22?S21)/(T2?T1)| and |(S13?S12)/(T3?T2)|>|(S23?S22)/(T3?T2)| are satisfied.

Abstract: A non-reciprocal device includes at least one ferrimagnetic member (21 or 22). By controlling the FMR linewidth ?H of the ferrimagnetic members (21 and 22), intermodulation distortion is controlled.

Abstract: A non-reciprocal circuit element includes a microstrip TMn10 resonator (n is a positive integer) with a metal disk and branches projecting from the metal disk in a trigonally symmetric structure, and a ferrite magnetic body spontaneously magnetized and coaxially disposed on the microstrip TMn10 resonator. The metal disk and the branches are formed on a non-magnetic dielectric board having a ground conductor on its bottom face. The ferrite magnetic body is arranged so that a position of an electric field node matches to one of the branches.

Abstract: A non-reciprocal circuit element includes a microstrip TMn10 resonator (n is a positive integer) with a metal disk and branches projecting from the metal disk in a trigonally symmetric structure, and a ferrite magnetic body spontaneously magnetized and coaxially disposed on the microstrip TMn10 resonator. The metal disk and the branches are formed on a non-magnetic dielectric board having a ground conductor on its bottom face. The ferrite magnetic body is arranged so that a position of an electric field node matches to one of the branches.