Waveguide comprised of stacked lower and upper plates, where the lower plate is mounted on a circuit board and has a via therein for accommodating a launcher in the via

A waveguide interposed between a circuit board and an antenna, comprising:

• a lower plate stacked on an upper surface of the circuit board and having a first vertical through-hole formed therein;
• and
• an upper plate stacked on an upper surface of the lower plate, having a second vertical through-hole formed at a position spaced apart from a region overlapping the first vertical through-hole, and having a horizontal groove connecting the first vertical through-hole and the second vertical through-hole;
• wherein the circuit board includes a launcher mounted on the upper surface of the circuit board and configured to transmit or receive radio waves,
• the first vertical through-hole is formed to vertically pass through a region of the lower plate that overlaps a first region of the upper surface of the circuit board where the launcher is located;
• and
• when the lower plate is stacked on the upper surface of the circuit board, the launcher is accommodated within the first vertical through-hole to be spaced apart from an inner wall of the first vertical through-hole and is exposed upward through the first vertical through-hole,
• wherein a height of the launcher is smaller than a depth of the first vertical through-hole so that an upper end of the launcher does not protrude beyond the upper surface of the lower plate.