| 摘要 |
PURPOSE:To widen the transmission band range of a signal transmission duct by making the dielectric characteristic of a connecting insulator equal to that of an intermediate supporting insulator and making the arrangement interval of the intermediate supporting insulators equal to that of the connecting insulators. CONSTITUTION:In a duct housing 1, a plurality of intermediate supporting insulators 3 for supporting the intermediate part of a conductor unit 2 and a connecting insulator 7 which possesses the equal dielectric characteristic to that of the intermediate supporting insulator and supports the butt-joint parts of a plurality of conductor units 2 are fixed. A plurality of intermediate supporting insulator 2 and the connecting insulators 7 are set at equal arrangement intervals.
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