Patent ID: 7186922

Claim:
A circuit board comprising: a dielectric substrate; a trace extending along a surface of the dielectric substrate, the trace having a first and a second portion, the trace being covered by a first medium at the first portion, wherein the first medium is formed by an encapsulation element of a dielectric material so that an effective dielectric constant of the first medium is different from an effective dielectric constant of a second medium extending over the trace at the second portion; and a second trace extending along the surface of the dielectric substrate, wherein the second trace has a first and a second portion, the first portion of the second trace being covered by a second encapsulation element wherein the second encapsulation element comprises a third medium with an effective dielectric constant being different from the effective dielectric constant of a fourth medium extending over the second portion of the second trace; wherein the length of the trace is shorter than the length of the second trace and the length of the first portion of the trace is larger than the length of the first portion of the second trace.