Patent ID: 6597265
Filing Date: 2003-07-22
Classification: H01P

Abstract:
An electronic filter including:a substrate with a generally planar first surface, said substrate comprising a ferroelectric layer positioned adjacent to said first surface; a ground conductor positioned beneath said ferroelectric layer; a first linear microstrip positioned on said first surface of the substrate and having a first end connected to the ground conductor; a first capacitor connected between a second end of the first linear microstrip and the ground conductor; a second linear microstrip, positioned on the first surface of the substrate parallel to the first linear microstrip, and having a first end connected to the ground conductor; a second capacitor connected between a second end of the second linear microstrip and the ground conductor; a third linear microstrip positioned on the first surface of the substrate between the first and second linear microstrips and parallel to the first and second linear microstrips, and having a first end connected to the ground conductor; a third capacitor connected between a second end of the third linear microstrip and the ground conductor; a U-shaped microstrip positioned between the first and third linear microstrips, the U-shaped microstrip including first and second extensions positioned parallel to the first, second and third linear microstrips; a fourth capacitor connected between a first end of the first extension of the U-shaped microstrip and the ground conductor; a fifth capacitor connected between a first end of the second extension of the U-shaped microstrip and the ground conductor; an input coupled to the first linear microstrip, wherein each of the fourth and fifth capacitors comprises a voltage tunable dielectric capacitor including a pair of metal electrodes positioned on top of said ferroelectric layer; and an output coupled to the second linear microstrip.