Patent ID: 8900964

Claim:
A method of fabricating a back-end-of-line wiring structure, the method comprising: forming a trench intersecting a top surface of a dielectric layer and extending into the dielectric layer; forming a layer having a first vertical segment on a first sidewall of the trench, a second vertical segment on a second sidewall of the trench, and a horizontal segment connecting the first and second vertical segments; removing the horizontal segment of the layer; and depositing at least one electrical insulator on the top surface of the dielectric layer, the at least one electrical insulator including a portion that completely fills a space between the first vertical segment of the layer on the first sidewall of the trench and the second vertical segment of the layer on the second sidewall of the trench, wherein the layer is comprised of a conductor, and the layer has a thickness selected to provide a low resistance path for conducting a high frequency signal.