| 摘要 |
PROBLEM TO BE SOLVED: To attain light weight and high rigidity of a three-dimensional waveguide at the same time. SOLUTION: A circumferential wall of a hollow structure is made of a triaxially woven member which is woven by using three groups of carbon fibers a, b and c, each having a conductivity similar to that of a metal, with a cross angle of 60 deg. among the fiber groups. The cross section of the hollow structure may be circular or square and a metallic film with a low resistance may be provided to the inner surface of the hollow structure. |
