Patent ID: 7808445

Claim:
An antenna device for a portable radio communication device operable in at least a first and a second frequency band, the antenna device comprising: an electrically conductive radiating element simultaneously operable in at least said first and second frequency band, said electrically conductive radiating element including a first feeding portion connectable to a feed device of said radio communication device for feeding and receiving radio frequency signals; a ground plane a distance from said radiating element; a DC-blocking device coupled between a first position on said radiating element and said ground plane; a first filter coupled between said first feeding portion and said radiating element; and a controllable switch coupled between a second position on said radiating element and said ground plane, such that there is a substantial radiating end of the radiating element on a side of the second position which is opposite the first position, allowing the antenna device to act as a planar inverted F antenna regardless of the state of said switch.