Antenna operating in two frequency ranges

Communications: radio wave antennas – Antennas – Spiral or helical type

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343749, H01Q 136

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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.

REFERENCES:
patent: 4229743 (1980-10-01), Vo et al.
patent: 4442438 (1984-04-01), Siwiak et al.
patent: 4772895 (1988-09-01), Garay et al.
patent: 4998078 (1991-03-01), Hulkko
patent: 5239304 (1993-08-01), Egashira
patent: 5274388 (1993-12-01), Ishizaki et al.
patent: 5341149 (1994-08-01), Valimaa et al.
patent: 5374937 (1994-12-01), Tsunekawa et al.
patent: 5479178 (1995-12-01), Ha

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