Foldable mobile telephone terminal with antenna and ground plane made in one piece

The present invention relates to a portable communication device and an antenna system. The device comprises an antenna feeding circuit and at least a first part having a hollow interior where different electrical elements are provided and provided with a main section having a certain width, length and a first height, and an antenna system. The antenna system comprises a ground plane located within and extending along essentially the whole width and length of at least the main section and an antenna element located within the first part. The ground plane is provided in one piece and the only electrical elements of the first part being electrically connected to say ground plane are radio transmission elements.