A multilayer transition structure for millimeter wave, comprising: a multilayer structure comprising a first layer having a first transmission line comprising a strip body and a second layer having a second transmission line comprising a strip body; and a transition structure comprising a first layer signal element, a plurality of first layer ground elements coupled to the first layer of the multilayer structure, a plurality of second layer ground elements coupled to the second layer of the multilayer structure, at least one intermediate layer comprising at least one intermediate layer signal element disposed between the first layer and the second layer and coupled to the first layer signal element, and a plurality of intermediate layer ground elements, wherein the first layer signal element is coupled to an end of the first transmission line, wherein the plurality of first layer ground elements surrounds the first layer signal element, the strip body of the first transmission line and the end of the first transmission line, wherein the plurality of second layer ground elements surround the strip body of the second transmission line and an end of the second transmission line, and wherein the plurality of intermediate layer ground elements surrounds the at least one intermediate layer signal element quasi-coaxially, the multilayer structure further comprises at least one third layer (34, 34') disposed between the at least one intermediate layer and the second layer, wherein the at least one third layer (34, 34') has a third cavity (340, 340') having a shape corresponding to the strip body of the second transmission line; and the transition structure further comprises at least one third layer signal element (24, 24') and a plurality of third layer ground elements (44, 44'), wherein the at least one third layer signal element (24, 24') is coupled to the first layer signal element, and wherein the second transmission line is coupled to the first layer signal element via the at least one intermediate layer signal element and via the at least third layer signal element, wherein wherein the plurality of third layer ground elements (44, 44') are arranged along an edge of the third cavity (340, 340') equidistantly from the edge of the third cavity (340, 340'), and wherein the multilayer transition structure is characterized in that a distance between the at least one third layer signal element (24, 24') and the plurality of third layer ground elements (44, 44') is greater than a distance between the at least one intermediate layer signal element and the plurality of intermediate layer ground elements. a multilayer structure comprising a first layer having a first transmission line comprising a strip body and a second layer having a second transmission line comprising a strip body; and a transition structure comprising a first layer signal element, a plurality of first layer ground elements coupled to the first layer of the multilayer structure, a plurality of second layer ground elements coupled to the second layer of the multilayer structure, at least one intermediate layer comprising at least one intermediate layer signal element disposed between the first layer and the second layer and coupled to the first layer signal element, and a plurality of intermediate layer ground elements, wherein the first layer signal element is coupled to an end of the first transmission line, wherein the plurality of first layer ground elements surrounds the first layer signal element, the strip body of the first transmission line and the end of the first transmission line, wherein the plurality of second layer ground elements surround the strip body of the second transmission line and an end of the second transmission line, and wherein the plurality of intermediate layer ground elements surrounds the at least one intermediate layer signal element quasi-coaxially, the multilayer structure further comprises at least one third layer (34, 34') disposed between the at least one intermediate layer and the second layer, wherein the at least one third layer (34, 34') has a third cavity (340, 340') having a shape corresponding to the strip body of the second transmission line; and the transition structure further comprises at least one third layer signal element (24, 24') and a plurality of third layer ground elements (44, 44'), wherein the at least one third layer signal element (24, 24') is coupled to the first layer signal element, and wherein the second transmission line is coupled to the first layer signal element via the at least one intermediate layer signal element and via the at least third layer signal element, wherein wherein the plurality of third layer ground elements (44, 44') are arranged along an edge of the third cavity (340, 340') equidistantly from the edge of the third cavity (340, 340'), and wherein the multilayer transition structure is characterized in that a distance between the at least one third layer signal element (24, 24') and the plurality of third layer ground elements (44, 44') is greater than a distance between the at least one intermediate layer signal element and the plurality of intermediate layer ground elements.