Patent ID: 7808433
Filing Date: 2010-10-05
Classification: H01Q

Abstract:
1. An antenna device for a portable radio communication device operable in at least a first and a second frequency band, said antenna device comprising: a radiating element having a feeding portion connectable to a feed device of said radio communication device for feeding and receiving radio frequency signals; a first ground plane portion arranged at a distance below said radiating element; a second ground plane portion; a high pass filter coupled between said first and second ground plane portions, which high pass filter allows said radio frequency signals to pass thereby forming a configuration that is analog to a ground plane having a slit, and a controllable switch arranged between and directly connected to the first and second ground plane portions for selectively interconnecting or disconnecting said first and second ground plane portions, to alter an effective operating frequency band of said antenna by controlling the slit length between said first and second ground plane portions.