Allgon Ab

Gunnar Filipsson

Gunnar Engblom

Bo Wass

Magnus Marthinsson

A multi-band antenna for mounting on the housing of a hand-portable telephone, the antenna comprising a feed portion and an antenna whip, arranged to slide into and out of the telephone to retracted and extended positions and combined with a multi-band helical structure. There are alternative ways disclosed of arranging the helical structure and other possible radiating elements of the antenna means to attain operability within separated frequency bands, for example, at 900 and 1800 MHz. In some configuration, the antenna means requires an impedance matching circuit in order to be operable at different frequency bands.

Dual band antenna means incorporating helical and elongated radiating

An compact antenna device which is intended for a small-size portable radio communication device and comprises a ground plane (1), a first radiating patch (2), a grounding means (3) connecting the patch and the ground plane. The patch is fed by a feeding means (6) which is situated on the same or opposite side of the ground plane or coplanar therewith and couples through a slot (5) provided in the ground plane. The disclosed antenna device may include further radiating patches in the same or higher levels as the first radiating patch. The antenna device also provides for wideband and/or multiband operation.

Growing community of inventors

Linkoping, Sweden

Gunnar Filipsson