Patent ID: 6646522
Filing Date: 2003-11-11
Classification: H01P

Abstract:
A phase shifter comprising:a substrate; a tunable dielectric film having a dielectric constant between 70 and 600, a tuning range of 20 to 60%, and a loss tangent between 0.008 and 0.03 at K and Ka bands, the tunable dielectric film being positioned on a surface of the substrate; a coplanar waveguide positioned on a surface of the tunable dielectric film opposite the substrate; an input for coupling a radio frequency signal to the coplanar waveguide; an output for receiving the radio frequency signal from the coplanar waveguide; a connection for applying a control voltage to the tunable dielectric film; wherein the coplanar waveguide comprises: conductive strip; a first electrode position adjacent a first side of said conductive strip to define a first gap between the first electrode and the conductive strip; a second electrode position adjacent a second side of said conductive strip to define a second gap between the second electrode and the conductive strip; a third electrode position adjacent a first side of said first electrode opposite said conductive strip to define a third gap between the first electrode and the third electrode; and a fourth electrode position adjacent a first side of said second electrode opposite said conductive strip to define a fourth gap between the second electrode and the fourth electrode.