an antenna device for a portable radio communication device operable in at least a first and a second frequency band , and comprising a first electrically conductive planar radiating element having a feeding portion connectable to a feed device of the radio communication device , and a second electrically conductive planar radiating element having a grounding portion connectable to ground . a controllable switch is arranged between the first and second radiating elements for selectively interconnecting and disconnecting the radiating elements , wherein the state of the switch being controlled by means of a control voltage input . a first filter is arranged between the feeding portion and the control voltage input , wherein the first filter is arranged to block radio frequency signals . by providing a high pass filter between the first and second generally planar radiating elements provided above a ground plane , quad - band operation is provided with high efficiency in a physically small antenna device .