| 摘要 |
PROBLEM TO BE SOLVED: To strengthen a structure by altering the helical member of a helical antenna. SOLUTION: A cylinder 1, a center shaft 2 and eight ribs 3 are molded integrally with plastic. The eight ribs 3 are formed symmetrically and radially around the shaft 2 and connect the shaft 2 to the inner circumferential surface of the cylinder 1. The shaft 2 and the respective ribs 3 are formed over the entire length of the cylinder 1 from one end to the other. The outer circumferential surface is wrapped with an antenna pattern film 4. The film 4 is constituted so that a plurality of conductor patterns 6 are printed on an insulation sheet 5 helically.
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