Mobile communication device and built-in antenna integrated with a ground portion thereof

A mobile communication device comprising an antenna structure, with the antenna structure comprising:

• a dielectric substrate having a planar surface, one edge, a ground plane, a first non-ground region, and a second non-ground region plane, wherein the ground plane comprises a main ground and a protruded ground, with the protruded ground electrically connected to the main ground and extending between the first non-ground region and the second non-ground region,
• wherein the first non-ground region and the second non-ground region are separated by the protruded ground;
• wherein the protruded ground has one edge at the one edge of the dielectric substrate;
• wherein the protruded ground disposes a data transmission element directly to define a data transmission interface between the mobile communication device and an external device;
• and an antenna being a planar structure and located on the planar surface of the dielectric substrate, with the antenna comprising a feeding strip and a radiating strip,
• wherein the feeding strip and the radiating strip are on a same plane as the, planar surface of the dielectric substrate, wherein the feeding strip is located inside the first non-ground region and does not overlap a part of the ground plane,
• wherein the feeding strip is not directly connected to the radiating strip, with the radiating strip extending over the protruded ground and having a first end located in the first non-ground region and directly connected to the main ground, with the radiating strip having a second end located in the second non-ground region and directly connected to the protruded ground, with a coupling gap disposed between the radiating strip and the feeding strip in the first non-ground region;
• wherein the radiating strip is excited by the capacitive coupling effect from the feeding strip via the coupling gap and the radiating strip does not overlap a part of the ground plane except over the protruded ground.