Patent ID: 6917338

Claim:
Antenna diversity of an electronic device, in particular of a cellular terminal, comprising: a first and a second antenna element ( 110 a , 110 b ) one of which being operated in an active mode by being connected to a transceiver ( 160 ) of said electronic device for transceiving electromagnetic signals whereas the other one of which being operated in a parasitic mode by interfering the impedance of the antenna element in the active mode due to electromagnetic coupling; wherein the antenna element ( 110 a , 110 b ) in the parasitic mode has an adjustable impedance; characterized by a switching unit ( 120 ) for either operating the first antenna element ( 110 a ) in the parasitic mode and simultaneously operating the second antenna element ( 110 b ) in the active mode or alternatively operating the first antenna element in the active mode and simultaneously operating the second antenna element in the parasitic mode; a pre-selection unit ( 130 ) for providing N configurations of the antenna diversity ensuring that the amount of a mismatch between the impedance of the antenna element in the active mode and the impedance of the transceiver ( 160 ) is below a predetermined threshold value, respectively, wherein each of said configurations represents a particular position of the switching unit ( 120 ) in combination with a particular predetermined amount of the impedance ( 170 a or 170 b ) of that antenna element which is—due to the position of said switching unit ( 120 )—operated in the parasitic mode; a selection unit ( 140 ) for selecting that single specific configuration out of the plurality of the N configurations provided by the pre-selection unit ( 130 ) fulfilling a predetermined signal quality criterion for the transceived electromagnetic signal best; and a control unit ( 150 ) for adjusting the position of the switching unit ( 120 ) and the amount of the impedance ( 170 a or 170 b ) of that antenna element which is—due to the position of the switching unit ( 120 )—operated in the parasitic mode, according to the selected specific configuration.