Patent ID: 7586386

Claim:
A transmission line transition, comprising: a first dielectric substrate; a second dielectric substrate spaced from the first dielectric substrate, and a dielectric layer interposed between the first dielectric substrate and the second dielectric substrate, wherein the first dielectric substrate has a pair of conductors for a coplanar strip transmission line and an electromagnetically coupling conductor for the coplanar strip transmission line disposed on a surface of the first dielectric substrate closest to the dielectric layer; the electromagnetically coupling conductor for the coplanar strip transmission line is a semi-loop shape with a discontinuity partly disposed therein; respective portions of the electromagnetically coupling conductor for the coplanar strip transmission line, which are located at both ends of the discontinuity or in a vicinity of both ends of the discontinuity, are connected to respective ends of the pair of conductors for the coplanar strip transmission line or portions of the pair of conductors in a vicinity of the respective ends of the pair of conductors, the pair of conductors extending toward a direction to be apart from the electromagnetically coupling conductor, a portion of the electromagnetically coupling conductor for the coplanar strip transmission line located in the vicinity of one of the ends of the discontinuity is perpendicular to a portion of the pair of conductors in the vicinity of one of the ends of the pair of conductors, the portion of the electromagnetically coupling conductor for the coplanar strip transmission line being linearly extended toward a direction to be apart from the pair of conductors for the coplanar strip transmission line; the semi-loop shape is a rectangular shape or a substantially rectangular shape; the second dielectric substrate has a grounding conductor disposed on a surface close to the dielectric layer, the grounding conductor having a first slot and a second slot disposed therein so as to be parallel or substantially parallel to each other; the grounding conductor has a connecting slot disposed therein so as to connect between the first slot and the second slot so that the first slot, the second slot, and the connecting slot form an electromagnetic coupling slot in an H-character shape or substantially H-character shape; the electromagnetic coupling slot is disposed so that the connecting slot intersects a longitudinal direction of the rectangular shape or the substantially rectangular shape of the semi-loop shape; and the second dielectric substrate has an electromagnetically coupling conductor for a microstrip transmission line disposed on a surface remote from the dielectric layer so as to pass over or under the connecting slot.