WAVEGUIDE CONNECTION STRUCTURE, ANTENNA DEVICE AND RADAR DEVICE

摘要

PROBLEM TO BE SOLVED: To join signals between one waveguide line and a plurality of waveguide lines while connecting the one waveguide line and the plurality of waveguide lines so that magnetic field surfaces of the one waveguide line become parallel to electric field surfaces of the plurality of waveguide lines.SOLUTION: A waveguide connection structure includes first, second, third and fourth waveguide lines. The third waveguide line includes: a first coupling window formed on one of magnetic field surfaces thereof; a second coupling window formed on one of electric field surfaces thereof; a third coupling window formed on the other of the electric field surfaces; and first and second short-circuit surfaces blocking both ends of the third waveguide line. The first coupling window joins the first waveguide line with the third waveguide line so that the electric field surfaces of the first waveguide line become parallel to the electric field surfaces of the third waveguide line. The second coupling window joins the second waveguide line with the first waveguide line so that the electric field surfaces of the second waveguide line become parallel to the magnetic field surfaces of the first waveguide line. The third coupling window joins the fourth waveguide line with the first waveguide line so that the electric field surfaces of the fourth waveguide line become parallel to the magnetic field surfaces of the first waveguide line.