| 摘要 |
PROBLEM TO BE SOLVED: To provide a helical antenna that can be manufactured easily and can well maintain dimensional accuracy. SOLUTION: This helical antenna has one set of radiating sections composed of two conductor wires wound spiral in form around its body section A. The radiating sections are composed of a center conductor and an external conductor. The radiating sections have a strip line 5, which is wound around the body section A in prescribed pitch and the external conductor of which becomes one helical radiating section, radiating-section conductor foil 6 which is wound around the body section A in the same pitch as that of the strip line 5 and becomes the other helical radiating section, and a feeding point 2 which is positioned at one end of the body section A and connects the strip line 5 to the conductor foil 6. The radiating sections also have a coaxial cable/strip line converting section 7, which is positioned at the other end of the body section A and couples a coaxial cable 2 which is used for feeding electricity to the helical antenna with the strip line 5.
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