Patent ID: 7567147

Claim:
A directional coupler comprising: a first dielectric layer; a second dielectric layer; and two line electrodes arranged on each of the first and second dielectric layers; wherein the two line electrodes include an inner line electrode and an outer line electrode that surrounds the inner line electrode, as viewed from above, such that only some sections of the inner line electrode oppose some sections of the outer line electrode and remaining sections of the inner line electrode do not oppose remaining sections of the outer line electrode; a first end of the inner line electrode arranged on the first dielectric layer and a first end of the inner line electrode arranged on the second dielectric layer are connected through a first via hole in the first dielectric layer; a first end of the outer line electrode arranged on the first dielectric layer and a first end of the outer line electrode arranged on the second dielectric layer are connected through a second via hole in the first dielectric layer; and corresponding currents are transmitted in the same direction through sections of the inner line electrode and the outer line electrode that are adjacent and substantially parallel to each other.