| 主权项 |
1. A radio frequency directional coupler comprising:
a first transmission line element disposed on a dielectric substrate, and having a first end and a second end; a second transmission line element disposed on said dielectric substrate, and having a first end and a second end, said first and said second transmission line elements disposed on a first plane, and at least a portion of said first and second transmission line elements are adjacent along a path; at least a third transmission line element which extends substantially coextensive with a length of said first and second transmission line elements, at least said third transmission line element disposed along said path between said first and said second transmission line elements and separated therefrom by a portion of said dielectric substrate, said third transmission line element electrically connected at a plurality of distributed locations along its length directly to a ground plane disposed on a surface of said dielectric substrate opposed from said first and second transmission line elements; and wherein said radio frequency directional coupler is configured to couple signals from the first transmission line element to the second transmission line element, and said at least one third transmission line element is configured to reduce an amount of coupling between the first and second transmission line. |
