FLEXIBLE WAVEGUIDE, IMAGE TRANSMISSION DEVICE HAVING FLEXIBLE WAVEGUIDE, ENDOSCOPE AND ENDOSCOPE SYSTEM HAVING FLEXIBLE WAVEGUIDE

To achieve both of the proper flexibility and excellent transmission characteristic in a flexible waveguide of transmitting an electric wave at the frequency equal to or greater than the desired millimeter wave (including the sub-millimeter wave).SOLUTION: A flexible waveguide 50 includes: a linear dielectric body 51 which has the uniform dielectric constant in the longitudinal direction and in which the cross sections perpendicular to the longitudinal direction have the same shape; and a flexible external conductor 53 which is arranged on the outer periphery of the linear dielectric body 51 and has a metal layer on the inner surface. The cross section of the dielectric body 51 forms the ridge shape. The external conductor 53 has the braid structure.SELECTED DRAWING: Figure 8 【課題】所望のミリ波（サブミリ波を含む）以上の周波数の電波を伝送する可撓性導波管において適切な可撓性と優れた伝送特性とを両立する。【解決手段】長手方向に誘電率が均一、かつ、長手方向に垂直な断面が同一形状を呈する線状の誘電体５１と、前記線状の誘電体５１の外周に配設され、内側表面に金属層を備えた可撓性を有する外部導体５３と、を有する可撓性導波管５０であって、前記誘電体５１の断面がリッジ形状を形成し、前記外部導体５３は組紐構造を有する。【選択図】図８