| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized irreversible circuit device with less number of components, ease of assembling and high performance and to provide a communication unit. SOLUTION: The irreversible circuit device 1 mainly comprises a metallic case 5, permanent magnets 9, 10 and a center electrode assembly 13. A side face 9d of the permanent magnet 9 is pressed into contact with an inner side face 6a of a side wall 5b of a metallic case 5 and a magnetic pole face 9b is pressed into contact with an inner side face 6c. A side face 10c of the permanent magnet 10 is pressed into contact with an inner side face 6b of a side wall 5b of the metallic case 5, and a magnetic pole face 10a is pressed into contact with an inner side face 6d. A ferrite 20 of the center electrode assembly 13 is placed between the permanent magnets 9, 10 and in the middle of the metallic case 5. The permanent magnets 9, 10 form a DC magnetic field whose line of magnetic force is emitted from a magnetic pole face 9a of the permanent magnet 9 toward a magnetic pole face 10b of the permanent magnet 10. A center line L1 of the permanent magnet 9, a center line L2 of the permanent magnet 10, and a center line L3 of the ferrite 20 are deviated with each other in parallel.
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