Patent ID: 8041295

Claim:
A mobile communication device, comprising: a noncontact communication portion that performs a noncontact communication with a plurality of external equipments, the noncontact communication portion including: (i) a control portion; (ii) a first antenna coupled to the control portion through a first pair of terminals, the first antenna being configured by a first antenna tuning circuit to resonate at a first frequency; (iii) a second antenna coupled to the control portion through a second pair of terminals, the second antenna being configured by a second antenna tuning circuit to resonate at a second frequency, the second antenna tuning circuit including: a first capacitor that is arranged between the second pair of terminals; a second capacitor that is arranged between the first capacitor and the control portion; a third capacitor that is arranged between the first capacitor and the control portion, wherein the third capacitor connects with the first capacitor via one common node, and connects to ground via another node; and a switch provided for the second capacitor, while no switch is provided for the first capacitor nor for the third capacitor; and (iv) a switching unit capable of opening and closing the switch for the second capacitor according to a type of at least one of the plurality of external equipments in communication with the noncontact communication portion, the switching unit further capable of switching the second antenna to resonate at the second frequency by closing the switch and at a third frequency different from the second frequency by opening the switch.