Patent ID: 8760243

Claim:
A tunable bandpass filter comprising: a carrier having a top surface and extending from a first portion to a second portion; a dielectric substrate disposed on the top surface of the carrier and having a first surface opposite to a second surface; a conductive ground plane disposed on the first surface of the dielectric substrate; a conductive trace pattern disposed on the second surface of the dielectric substrate, the trace pattern defining a phase velocity compensation transmission line section comprising a series of spaced alternating T-shaped conductor portions; a cantilevered structure consisting of at least one piezoelectric transducer, each of the at least one piezoelectric transducer having a first end supported at the first portion of the carrier and a second end cantilevered relative to the first end; and a tuning substrate attached to the second end of the at least one piezoelectric transducer and disposed at a preselected distance apart from the trace pattern; wherein the tuning substrate is configured to move when a voltage is applied to the piezoelectric transducer; and wherein a movement of the tuning substrate results in a change to an effective dielectric constant of the filter.