| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size of a helical antenna smaller, formed by a punching and a bent molding of a metal plate. SOLUTION: A metal plate 10, formed in a meandering shape is bent, so that a step is formed in a part 10b extending in its meandering pitch direction, to form a helical shape to form a helical antenna. Since the helical pitch can be set smaller than a meandering pitch, a small-sized helical antenna having a small helical pitch can be attained.
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