Patent ID: 7154355

Claim:
A transmission line having a transforming impedance and surface solder lands, the transmission line comprising: a dielectric substrate having a surface; a slot formed through the surface of said dielectric substrate, said slot having a depth D 1 and having first and second opposing faces spaced apart from each other by an intervening space, said slot also being comprised of a first length having a first and second end and along which the opposing slot faces each have a conductive surface extending downward from the substrate surface into said slot to a depth, D 2 ; and, a second length of said slot having a first end abutting the second end of said first length, the opposing slot faces in said second length each having a conductive surface at the first end of said second length that is electrically continuous with the conductive surfaces in said first length and which, at the first end of said second length, extends from the substrate surface down into said slot to said depth D 2 , the conductive surfaces on the opposing faces of said second length, continuously receding up from said depth D 2 , along the length of said second section, to a zero depth at the second end of said second section; and, at the first end of said second length, said dielectric substrate surface having surface metallization on both sides of said slot, said surface metallization on both sides of said slot being of zero width at the first end of the second section and continuously extending away from the opposing slot faces to a distance D at the end of said second section, said surface metallization being electrically conductive with the conductive surface within said slot sections.