The invention discloses a slot-
coupling directional coupler based on an integrated substrate gap
waveguide. The coupler comprises two ISGW
coupling waveguides with same structure, and each
coupling waveguide comprises a via hole layer
dielectric plate and a gap layer
dielectric plate. One surface of the via hole layer
dielectric plate is printed with a
metal ground layer, the other surface of thevia hole layer
dielectric plate is printed with a periodic circular
metal patch and a coupling
microstrip line, and
metal via holes are formed in the circular metal patch and the coupling
microstrip line; one surface of the gap layer
dielectric plate is printed with a coupling
microstrip line, and the other surface of the gap layer
dielectric plate is printed with a metal
ground layer with a coupling gap; the upper surface of each gap layer dielectric plate is tightly connected with the lower surface of the corresponding via hole dielectric plate to form the corresponding coupling
waveguide; and the two coupling waveguides are tightly connected after 180-degree relative rotation. The slot-coupling directional coupler can overcome the disadvantages of an existing coupler, realizes broad
broadband and relatively
high isolation simultaneously, and has the advantages of easy integration, small size, adjustable coupling coefficient, broad
broadband, relatively
high isolation, applicabilityfor 5G frequency bands and the like.