| 摘要 |
PROBLEM TO BE SOLVED: To provide a helical antenna that is inexpensive and can be manufactured easily, and its manufacturing method. SOLUTION: A copper wire 11 is arranged between concentrically arranged inner and outer cylinders while one end is fixed. The other end of the copper wire is twisted with the center axis of the inner and outer cylinders as the axis, and is wound around the inner cylinder spirally. An insulating resin is injected between the inner and outer cylinders. Then, the copper wire 11 that is deformed spirally is sealed into a cylindrical insulating resin 12.
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