US 6,597,265 B2Granted

Hybrid resonator microstrip line filters

AssigneeParatek Microwave, Inc.

InventorsXiao-Peng Liang, Yongfei Zhu

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Abstract

An electronic filter includes a substrate, a ground conductor, a plurality of linear microstrips positioned on a the substrate with each having a first end connected to the ground conductor. A capacitor is connected between a second end of the each of the linear microstrips and the ground conductor. A U-shaped microstrip is positioned adjacent the linear microstrips, with the U-shaped microstrip including first and second extensions positioned parallel to the linear microstrips. Additional capacitors are connected between a first end of the first extension of the U-shaped microstrip and the ground conductor, and between a first end of the second extension of the U-shaped microstrip and the ground conductor. Additional U-shaped microstrips can be included. An input can coupled to one of the linear microstrips or to one of the extensions of the U-shaped microstrips. An output can be coupled to another one of the linear microstrips or to another extension of one of the U-shaped microstrips. The capacitors can be voltage tunable dielectric capacitors.

Claims14

Dependent claims

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.

11 more elements

An electronic filter including:

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

12 more elements

Dependencies are inferred from the claim text.