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
Disclosed is a waveguide having a first vertical transfer path formed at a lower plate coupled to a signal processing substrate, and having a horizontal transfer path and a second vertical transfer that are formed at an upper plate coupled to a radar antenna, and thus minimizing tolerance during assembly. The disclosed waveguide is constructed by stacking the upper plate on the upper surface of the lower plate, a first vertical through-hole is formed in the lower plate, a second vertical through-hole and a horizontal groove are formed in the upper plate, and the horizontal groove connects the first vertical through-hole and the second vertical through-hole to form a radio wave transfer path.
1 . 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.
2 . The waveguide of claim 1 , wherein the second vertical through-hole is formed to vertically pass through the upper plate in a second region of the upper plate that is spaced apart from the region of the upper plate overlapping the first vertical through-hole.
3 . The waveguide of claim 1 , wherein the horizontal groove is formed in a lower surface of the upper plate in surface contact with the upper surface of the lower plate.
4 . The waveguide of claim 3 , wherein, as the upper plate is stacked on the lower plate, inner wall surfaces of the horizontal groove and the upper surface of the lower plate form a horizontal through-hole.
5 . The waveguide of claim 4 , wherein a first end of the horizontal through-hole is connected to the first vertical through-hole, and a second end of the horizontal through-hole is connected to the second vertical through-hole to form a radio wave transfer path.