Patent ID: 7671815
Filing Date: 2010-03-02
Classification: H01Q

Abstract:
1. An antenna device for a portable radio communication device operable in at least a first and a second frequency band, the antenna device comprising: a first electrically conductive radiating element having a feeding portion connected to a feed device of the radio communication device; a second electrically conductive radiating element having a grounding portion connectable to ground; a controllable switch arranged between the first and second radiating elements for selectively interconnecting and disconnecting the radiating elements, the state of the switch being controlled by means of a control voltage input; a first filter arranged between the feeding portion and the control voltage input, wherein the first filter is arranged to block radio frequency signals; a grounding portion of the first radiating element; a high pass filter arranged between the grounding portion of the first radiating element and ground; and a band-stop filter connected to the grounding portion of the second radiating element and being connectable to ground, the band-stop filter having a stop band at the lower of the first and second frequency bands; wherein the first and second radiating elements are generally planar and arranged at a predetermined distance above a ground plane.