Coupled microstrip lines with ground planes having ground strip shields and ground conductor extensions

摘要

A coupled microstrip line structure having tunable characteristic impedance and wavelength are provided. In accordance with one aspect of the invention, a coupled microstrip line structure comprises a first ground plane having a plurality of first conductive strips separated by a dielectric material, and a first dielectric layer over the first ground plane. The coupled microstrip line further comprises a first signal line over the first dielectric layer, wherein the first signal line is directly above the plurality of first conductive strips, and wherein the first signal line and the plurality of first conductive strips are non-parallel, and a second signal line over the first dielectric layer, wherein the second signal line is directly above the plurality of first conductive strips, and wherein the second signal line and the plurality of first conductive strips are non-parallel, and wherein the second signal line is substantially parallel to the first signal line.