Importance

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Abstract

The invention refer to a wireless handheld or portable device including an antenna system (250) capable of operation in a first frequency region and in a second frequency region, wherein the highest frequency of the second frequency region is lower than the lowest frequency of the first frequency region, the antenna system (250) comprising an antenna structure (260) including: an antenna element (251) having a first connection point (253a) and a second connection point (253b); a ground plane layer (202) having at least one connection point (204); a first internal port (261), said first port being defined between the first connection point (253a) of the antenna element (251) and one of the at least one connection point (204) of the ground plane layer (202); and a second internal port (262), said second port (262) being defined between the second connection point (253b) of the antenna element (251) and one of the at least one connection point (204) of the ground plane layer (202); the antenna system further comprising a first external port (231) for coupling electromagnetic wave signals in the first frequency region, a second external port (232) for coupling electromagnetic wave signals in the second frequency region, and a radiofrequency system (270) operatively connected between the first and second internal ports (261, 262) of the antenna structure (260) and the first and second external ports (231, 232) of the antenna system (250); wherein the input impedance of the antenna structure (260) at each of the first and second internal ports (261, 262) when disconnected from the radiofrequency system (270) features an imaginary part not equal to zero for any frequency of the second frequency region, so that the antenna structure (260) is not resonant for any frequency of the second frequency region; wherein the radiofrequency system (270) comprises a frequency-selective circuit (301) arranged so as to effectively short-circuit the second internal port (262) for the frequencies of the first frequency region but not for the frequencies of the second frequency region, to operatively connect the second external port (232) to one of the first and the second internal ports (261, 262) for the frequencies of the second frequency region but not for the frequencies of the first frequency region, and to operatively connect the first external port (231) to the first internal port (261) for the frequencies of the first frequency region. Further the invention refers to a corresponding method and a similar device and a further method corresponding to the similar device.

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First Claim