Waveguide assembly having: a first ridge waveguide; and a second waveguide; wherein the first ridge waveguide has a first housing having a first cavity, and a first ridge which in the first cavity extends in the longitudinal direction, wherein the first ridge is galvanically connected to a wall of the first housing; wherein the second waveguide has a second housing having a second cavity; wherein the first ridge waveguide in a connecting portion overlaps the second waveguide in the longitudinal direction of the waveguide assembly so as to establish a capacitive coupling between the first ridge and the second waveguide; wherein the first housing has a first window; wherein the second housing has a second window; wherein the first window in the connecting portion overlaps the second window, characterized in that the first ridge waveguide as well as the second waveguide in the connecting portion are imparted a stepped gradient in the longitudinal direction, both stepped gradients being complementary; wherein the overlap between the first ridge waveguide and the second waveguide is achieved in that the two complementary stepped gradients bear on one another when the first ridge waveguide bears on the second waveguide and defines an assembled state; wherein the first window and the second window are in each case disposed in a step face in the stepped gradient, wherein these two step faces extend in the longitudinal direction of the waveguide assembly, as a result of which the first window and the second window in the assembled state lie opposite one another and overlap one another as a result. a first ridge waveguide; and a second waveguide; wherein the first ridge waveguide has a first housing having a first cavity, and a first ridge which in the first cavity extends in the longitudinal direction, wherein the first ridge is galvanically connected to a wall of the first housing; wherein the second waveguide has a second housing having a second cavity; wherein the first ridge waveguide in a connecting portion overlaps the second waveguide in the longitudinal direction of the waveguide assembly so as to establish a capacitive coupling between the first ridge and the second waveguide; wherein the first housing has a first window; wherein the second housing has a second window; wherein the first window in the connecting portion overlaps the second window, characterized in that the first ridge waveguide as well as the second waveguide in the connecting portion are imparted a stepped gradient in the longitudinal direction, both stepped gradients being complementary; wherein the overlap between the first ridge waveguide and the second waveguide is achieved in that the two complementary stepped gradients bear on one another when the first ridge waveguide bears on the second waveguide and defines an assembled state; wherein the first window and the second window are in each case disposed in a step face in the stepped gradient, wherein these two step faces extend in the longitudinal direction of the waveguide assembly, as a result of which the first window and the second window in the assembled state lie opposite one another and overlap one another as a result.