| 摘要 |
An isolator includes a core isolator mounted on a circuit board and including a ferrite and permanent magnets to apply a direct-current magnetic field to the ferrite, and includes no yoke for controlling the leakage of the direct-current magnetic field out of the isolator. Power amplifiers are arranged in a straight line along with the core isolator interposed therebetween. A metal case covers the core isolator and the power amplifiers. The heights of the power amplifiers are greater than that of the core isolator.
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