| 摘要 |
PURPOSE: A multiple band helical antenna is provided to accomplish excellent characteristic at every band. CONSTITUTION: A multiple band helical antenna comprises a core(10), a feeding unit(20) and a cover(30). The core(10) is formed as a cylinder and made of insulating material such as plastic and ceramic. The core(10) includes a first to a third helical lines(11a,12a,13a) formed discretely on its surface and having pitch and length different from each other. The feeding unit(20) is formed at the bottom of the core(10) and electrically coupled to an external circuit. The cover(30) is made of plastic resin and wraps the outside of the helical antenna. To separate the helical lines(11a,12a,13a), separating lines(11b,12b,13b) of circular loops are formed at the end of the helical lines(11a,12a,13a).
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