| 摘要 |
PROBLEM TO BE SOLVED: To provide a coaxial feeding tube that can dissipate heat produced in its inner conductor due to a loss of the inner conductor via an outer conductor so as to reduce a temperature rise in the inner conductor. SOLUTION: The coaxial feeding tube is provided with the outer conductor, the inner conductor, and a spacer placed between the outer conductor and the inner conductor and supporting the inner conductor, the spacer is made of an insulating material with a large thermal conductivity (such as alumina, beryllium oxide, or aluminum nitride), and the spacer is shaped to be e.g. a truncated cone in a way that the position of the spacer in contact with the outer conductor in the length direction of the coaxial feeding tube is different from the position of the spacer in contact with the inner conductor in the length direction of the coaxial feeding tube.
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