Wireless device including a multiband antenna system

A wireless handheld or portable device comprising:

• an antenna system configured to operate in a first frequency region comprising a first frequency band, and a second frequency region comprising a second frequency band, said first and second frequency regions including a frequency gap in between;
• the antenna system comprising an antenna structure, a passive matching and tuning system, and an external input/output (I/O) port;
• the antenna structure comprising:
• a radiating element including a connection point;
• a ground plane layer having a perimeter within a ground plane rectangle that is the minimum-sized rectangle that encompasses the ground plane layer, the ground plane layer including at least one connection point at a corner of the ground plane rectangle;
• and
• an internal I/O port coupled between the connection point of the radiating element and the at least one connection point of the ground plane layer;
• the radiating element of the antenna structure extending beyond an edge of the ground plane layer, wherein at least a portion of an orthogonal projection of the radiating element on a plane containing the ground plane layer does not overlap the ground plane rectangle;
• the passive matching and tuning system comprising a first I/O port connected to the internal I/O port of the antenna structure, and a second I/O port connected to the external input/output (I/O) port of the antenna system;
• the antenna structure featuring an intrinsic frequency in the frequency gap between the first frequency region and the second frequency region, the intrinsic frequency being a first minimum of an input return loss curve of the antenna structure at the internal I/O port when disconnected from the passive matching and tuning system;
• the passive matching and tuning system modifying an impedance of the antenna structure and providing impedance matching to the antenna system to transmit and receive electromagnetic wave signals in the first frequency band;
• wherein a longest side of a radiator rectangle of the radiating element has a dimension smaller than one twentieth of a free-space operating wavelength corresponding to a lowest frequency of the first frequency region;
• and
• wherein a radiator contour of the radiating element features a complexity factor F21 less than 1.50 and a complexity factor F32 less than 1.50.