Patent ID: 8816914

Claim:
A communication device, comprising: a multilayer circuit board, comprising at least a first plane, a second plane and a third plane, wherein one of the first plane, the second plane and the third plane has a ground plane, and the ground plane is in proximity to a clearance region of the multilayer circuit board, and the clearance region is configured to accommodate an antenna structure, wherein the antenna structure comprises: a first metal portion, coupled through a feeding portion to a signal source; and a second metal portion, comprising at least a first line segment and a second line segment, wherein the first line segment and the second line segment are respectively disposed on any two planes of the first plane, the second plane and the third plane, and the first line segment is coupled through at least two conductive vias to the second line segment so as to form a loop structure, and the loop structure is substantially located at an end portion of the second metal portion and substantially perpendicular to the ground plane.