Communication device with ground plane antenna

A communication device, comprising:

• a ground element;
• a dielectric substrate, disposed nearby the ground element, the dielectric substrate having a first surface and a second surface;
• and
• an antenna element, consisting essentially of a first metal portion and a second metal portion, wherein the antenna element and the ground element form a ground plane antenna, a feeding point is disposed on the first metal portion, the first metal portion is disposed on the first surface, the second metal portion is disposed on the second surface, the first metal portion is electrically connected to the second metal portion through a conductive via-hole,
• wherein the first metal portion comprises a first edge away from the ground element and a second edge nearby the ground element, a first end of a diagonal of the first metal portion connects an end of the first edge, and a second end of the diagonal of the first metal portion connects an end of the second edge,
• wherein the feeding point is nearby the second end of the diagonal of the first metal portion and the conductive via-hole is nearby the first end of the diagonal of the first metal portion, such that a surface current flowing through the first metal portion electrically connected to the second metal portion is distributed more uniformly than that of the first metal portion which is not electrically connected to the second metal portion, and a projection of e second metal portion on the first surface is covered by the first metal portion,
• wherein a shape of the first metal portion is an inverted U shape and the first edge is an edge of a middle section of the inverted U shape, and the conductive via-hole is located at or nearby a corner of the second metal portion.