Patent ID: 7800544
Filing Date: 2010-09-21
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 first edge, a feeding portion connectable to a radio frequency feed device of the radio communication device and a grounding portion connectable to a ground device; a second electrically conductive radiating element having a first edge and a second edge; a controllable switch comprising a diode between the first edge of the first radiating element and the first edge of the second radiating element for selectively interconnecting and disconnecting the radiating elements, the state of the switch being controlled by means of a control voltage input; and a passive filter comprising a resistor and electrically connected directly to only the second edge of the second radiating element and the control voltage input such that the filter has purely resistive impedance, wherein the filter is arranged to block radio frequency signals when a current level through the diode is between about 5 milliamps and about 15 milliamps such that the diode is conductive and electrically interconnecting the radiating elements.