Antenna module

An antenna module, comprising:

• two antennas, wherein each of the two antennas has a longitudinal direction;
• and
• a reflecting board having a first surface and a second surface opposite to the first surface, wherein the first surface extends along a first axis and a second axis;
• the first axis is perpendicular to the second axis;
• the two antennas are disposed on the first surface and are spaced along the first axis;
• a spacing zone is defined in the reflecting board and is located between the two antennas;
• the spacing zone of the reflecting board has a plurality of open grooves, wherein each of the plurality of open grooves penetrates through the first surface and the second surface and has a longitudinal direction and a lateral direction;
• the longitudinal direction of each of the plurality of open grooves extends along the first axis or extends along the second axis;
• each of the plurality of open grooves is closed along the first axis and the second axis;
• when the longitudinal direction of each of the plurality of open grooves extends along the second axis, the longitudinal direction of each of the two antennas is parallel to the longitudinal direction of each of the plurality of open grooves, and two ends of each of the two antennas in the longitudinal direction of each of the two antennas are located between two ends of each of the plurality of open grooves in the longitudinal direction of each of the plurality of open grooves.