Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1996-06-05
2000-04-25
Wong, Don
Communications: radio wave antennas
Antennas
Spiral or helical type
343749, H01Q 136
Patent
active
060549661
ABSTRACT:
The invention relates to an antenna structure D with at least two resonance frequency bands. It comprises a first antenna element (P2; P3) which is preferably a straight conductor, and a second antenna element (HX3; HX4) which is preferably a conductor wound into a cylindrical coil, the antenna elements having different resonance frequencies. A rod element (P2; P3) is partly inside a helical element (HX3; HX4) and they can comprise the same feed point (A4) or separate feed points (A5; A6). The antenna can comprise a third antenna element (HX5) which is preferably a conductor wound into a cylindrical coil comprising a different resonance frequency from the other two antenna elements. The antenna according to the invention is well-adapted to be used in a mobile phone operating in at least two cellular telephone systems using different frequencies.
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Nokia Mobile Phones Limited
Phan Tho
Wong Don
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