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US 2002/0171592 A1Published application
Multiband antenna
AssigneeFiltronic LK Oy
InventorsJyrki Mikkola, Petteri Annamaa, Suvi Tarvas, Mari Paunuma
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AssigneeFiltronic LK Oy
InventorsJyrki Mikkola, Petteri Annamaa, Suvi Tarvas, Mari Paunuma
Estimating the term…
The invention relates to a multiband antenna which finds utility particularly in mobile stations. The antenna structure includes a PIFA-type antenna positioned inside the covers of a mobile station, which antenna includes a slot radiator (231). In the planar element there is a second slot (232) so that, viewed from a feed point (F), two radiating conductive branches (B1, B2) of different lengths are formed. Each of the three radiators has a separate operating band of its own. The structure also includes a whip element (211) movable with respect to the PIFA part. When the whip element is pulled out, its lower end is galvanically coupled with the shorter branch of the planar element, with its relatively narrow side branch (B12). The whip enhances the operation of the antenna especially in the lowest operating band. The influence of the pulled-out whip on the location of the uppermost operating band is compensated for by a third slot (233) in the planar element. Matching for the whip element is provided by shaping the conductive patterns existing in the planar element in any case. The structure is relatively simple and economical to fabricate. A good three-band planar antenna can be provided without a whip element as well.
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,
A mobile station having an antenna structure which comprises a multiband radiating planar element and a ground plane as well as a whip element movable with respect to these two, which whip element, when extended, has a galvanic connecting point with the planar element which planar element has an antenna feed point, a short-circuit point, and a first slot starting 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,
Dependencies are inferred from the claim text.