Multiband antenna system and methods

An antenna system of a radio device, said system comprising:

• a ground plane;
• at least two antennas each comprising a radiating element, wherein each radiating element comprises a conductor on a surface of a dielectric substrate;
• wherein a distance along said ground plane between two of said radiating elements belonging to different antennas is at least the combined length of these two radiating elements;
• and
• wherein at least one antenna is connected to an adjusting circuit.

A method of operating an antenna system of a radio device, said antenna system comprising a ground plane, an antenna, and an adjusting circuit, said method comprising:

• operating said antenna system in a first mode of operation;
• sending a control signal to said adjusting circuit, said control signal switching an operating mode of said adjusting circuit;
• operating said antenna system in a second mode of operation, said first and second modes of operation utilizing said antenna;
• and
• operating said antenna system in a third mode of operation, said third mode of operation also using said antenna.

An adjusting circuit for use with an antenna system of a radio device, said adjusting circuit comprising:

• an input electrically coupled to an antenna component;
• filter means;
• switching means;
• and
• a plurality of reactive circuits each coupled to an end of said switching means.