Built-in antenna

A built-in antenna comprising:

• a first printed circuit board (PCB) including:
• a plurality of antenna areas respectively arranged near a plurality of corners of the first PCB and spaced apart from each other, each corner of the first PCB having an individual antenna area;
• and
• a circuit component mounting area arranged outside the plurality of antenna areas;
• a second PCB facing and substantially parallel to the first PCB, wherein the second PCB includes a plurality of first antenna patterns arranged respectively at a plurality of locations respectively overlapping the plurality of antenna areas on the first PCB;
• and
• a third PCB arranged substantially perpendicular to the first PCB and the second PCB and having a first feeding unit electrically connecting the plurality of antenna areas of the first PCB respectively to the plurality of first antenna patterns of the second PCB,
• wherein the second PCB includes a second antenna pattern arranged at an additional pattern area located outside the plurality of locations of the second PCB in which the plurality of first antenna patterns is respectively arranged, and
• wherein the third PCB is connected to and vertically extends between an edge portion of the first PCB and an edge portion of the second PCB.