| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna structure for improving durability to repeated distortion that acts on an antenna. Ž<P>SOLUTION: The antenna structure includes a reinforcement member made of a plurality of non-conductive fibers having a twisted structure, and a conductive member spirally wound around the reinforcement member and made of a foil strip in which a conductive material is formed in the form of foil and a thin band. When a twist factor Nt of non-conductive fibers is defined by an expression (1): Nt=T×(0.125×(D/2)×1/ρ)<SP>1/2</SP>×10<SP>-3</SP>, wherein twist factor of fibers is defined as T(times/10 cm), total decitex of fibers is defined as D, and density of fibers is defined as ρ, a twist number Nt is in the range of 0.20 to 0.65, the fibers are made of organic fibers having at least a melting point of 200°C or more, and the fibers are made of a twisted structure obtained by bundling two first twist cords twisted by bundling a plurality of filaments and secondarily twisting them in a direction opposite from the twisting direction of the first twist cords. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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