Patent ID: 6531936
Filing Date: 2003-03-11
Classification: H01P

Abstract:
A reflective termination phase shifter comprising:a rat race coupler having an RF input and an RF output; first and second stubs positioned on said rat race coupler; a first reflective termination positioned adjacent to an end of said first stub; a second reflective termination positioned adjacent to an end of said second stub; wherein each of said first reflective termination and said second reflective termination includes a tunable varactor comprising a substrate having a first dielectric constant and having generally planar surface, a tunable ferroelectric layer positioned on the generally planar surface of the substrate, the tunable ferroelectric layer having a second dielectric constant greater than said first dielectric constant, and first and second electrodes positioned on a surface of the tunable ferroelectric layer opposite the generally planar surface of the substrate, said first and second electrodes being separated to form a gap therebetween; and wherein each of said first reflective termination and said second reflective termination further includes an inductor electrically connected in series with said varactor.