| 摘要 |
An outer conductor has a substantially cylindrical shape extending in an axial direction. A center conductor has a substantially cylindrical shape extending in the axial direction, and is provided inside the outer conductor. An insulator fixes the center conductor relative to the outer conductor. The center conductor is provided with a hole that communicates with the inside and the outside of the center conductor. The insulator extends, via the hole, to the inside of the center conductor from the outside.
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