| 摘要 |
PURPOSE: A helical antenna is provided to maximize a magnification effect of an operation frequency band of the helical antenna by differently forming the winding direction of a second helical element and a first helical element. CONSTITUTION: A helical antenna(200) comprises a dielectric structure(210), a first helical element(220), a second helical element(230), and a dielectric material cap(240). The dielectric structure has a cylindrical shape including an empty space in inside. The first helical element has a coil shape which is reeled to a specified direction. The first helical element is connected to a feeding point of a feeding signal for driving the helical antenna. The second helical element has the coil shape which is reeled to the specified direction. The dielectric material cap is combined with the dielectric structure on the upper side or lower side of the dielectric structure.
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