| 摘要 |
A nonreciprocal circuit device includes a permanent magnet, a ferrite element to which a DC magnetic flux is applied by said permanent magnet, a plurality of center electrodes provided on the ferrite element, an upper casing member, and a lower casing member. The upper and lower casing members accommodate the permanent magnet, the ferrite element, and the center electrodes. The thickness of the lower casing member is set to the range between 50% and 100% of the thickness of the upper casing member. The upper and lower casing members are made of an iron-based metal.
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