Patent ID: 6727857
Filing Date: 2004-04-27
Classification: H01Q

Abstract:
A multiband antenna comprising a ground plane and radiating planar element inside a radio apparatus, which planar element includes an antenna feed point, a short-circuit point, a planar element short-circuit point, and a first slot, which starts from the edge of the planar element, relatively near the short-circuit point, the first slot being arranged to resonate in a first operating band of the antenna, the antenna further comprising a whip element movable with respect to the planar element, which whip element, when extended, has a galvanic connecting point with the planar element,said planar element further including second and third slots starting from the edge of the planar element, which second slot divides the planar element, viewed from its feed point, into a first branch being arranged to resonate in a second operating band of the antenna, and into a second branch being arranged to resonate in a third operating band of the antenna, said third slot being arranged to resonate, when the whip element is extended, at a frequency which is higher than the center frequency of the first operating band of the antenna in order to provide matching for the antenna within the range of the first operating band.