Hybrid resonator microstrip line filters
First Claim
1. 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.
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Accused Products
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.
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Citations
14 Claims
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1. An electronic filter including:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
barium strontium titanate or a composite of barium strontium titanate.
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4. The electronic filter of claim 1, wherein said electrodes are separated to form a gap.
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5. The electronic filter of claim 4, further comprising:
an insulating material positioned between said pair of metal electrodes for insulating said pair of metal electrodes and the tunable dielectric film from first and second cavity resonators.
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6. The electronic filter of claim 1, wherein:
the U-shaped microstrip includes a shorted portion positioned adjacent to the first ends of the first and third linear microstrips.
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7. The electronic filter of claim 1, wherein:
the U-shaped microstrip includes a shorted portion positioned adjacent to the second ends of the first and third linear microstrips.
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8. An electronic filter including:
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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. - View Dependent Claims (9, 10, 11, 12, 13, 14)
barium strontium titanate or a composite of barium strontium titanate.
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11. The electronic filter of claim 8, wherein said electrodes are separated to form a gap.
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12. The electronic filter of claim 11, further comprising:
an insulating material position between said pair of metal electrodes for insulating said pair of metal electrodes and the tunable dielectric film from first and second cavity resonators.
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13. The electronic filter of claim 8, wherein each of the first and second U-shaped microstrips includes a shorted portion positioned adjacent to the first ends of the first and second linear microstrips.
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14. The electronic filter of claim 8, wherein each of the first and second U-shaped microstrips includes a shorted portion positioned adjacent to the second ends of the first and third linear microstrips.
Specification