Patent US6686817B2 successfully refreshed from Google Patents.
US6686817B2
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Electronic tunable filters with dielectric varactors
Assignee: NXP USA Inc
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Filing: 2000-12-12
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Granted: 2004-02-03
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Expires: 2020-12-12
Abstract
Abstract A radio frequency electronic filter includes an input, an output, and first and second resonators coupled to the input and the output, with the first resonator including a first voltage tunable dielectric varactor and the second resonator including a second voltage tunable dielectric varactor. The resonators can include a lumped element resonator, a ceramic resonator, or a microstrip resonator. Additional voltage tunable dielectric varactors can be connected between the input and the first resonator and between the second resonator and the output. Voltage tunable dielectric varactors can also be connected between the first and second resonators.
Inventors
- 👤 Yongfei Zhu
- 👤 Louise C. Sengupta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:14
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20336; H01P1/20354; H01P1/20381; H01P1/205; H01P1/2056
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
88 words
A radio frequency electronic filter comprising: an input; an output; first and second resonators coupled to the input and the output; the first resonator including a first voltage tunable dielectric varactor; and the second resonator including a second voltage tunable dielectric varactor, each of the first and second voltage tunable dielectric varactors comprising a tunable dielectric layer having a loss tangent less than 0.005 at around 2 GHZ and wherein the tunable dielectric layer is capable of low insertion loss and operation at non-chilled temperatures, including room temperature.
Claim 2
Dependent Claim
88 words
A radio frequency electronic filter comprising: an input; an output; first and second resonators coupled to the input and the output; the first resonator including a first voltage tunable dielectric varactor; and the second resonator including a second voltage tunable dielectric varactor, each of the first and second voltage tunable dielectric varactors comprising a tunable dielectric layer having a loss tangent less than 0.005 at around 2 GHZ and wherein the tunable dielectric layer is capable of low insertion loss and operation at non-chilled temperatures, including room temperature.
Claim 3
Dependent Claim
31 words
A radio frequency filter according to claim 1 , wherein each of the first and second resonators comprises one of: a lumped element resonator, a ceramic resonator, or a microstrip resonator.
Claim 4
Dependent Claim
27 words
A radio frequency filter according to claim 1 , wherein: the first resonator comprises a first microstrip resonator; and the second resonator comprises a second microstrip resonator.
Claim 5
Dependent Claim
42 words
A radio frequency filter according to claim 3 , further comprising: a third voltage tunable dielectric varactor connected between the first microstrip resonator and the input; and a fourth voltage tunable dielectric varactor connected between the second microstrip resonator and the output.
Claim 6
Dependent Claim
57 words
A radio frequency filter according to claim 4 , further comprising: a third resonator coupled to the first microstrip resonator; a fourth resonator coupled to the second microstrip resonator; the third resonator including a third microstrip and fifth voltage tunable dielectric varactor; and the fourth resonator including a fourth microstrip and a sixth voltage tunable dielectric varactor.
Claim 7
Dependent Claim
55 words
A radio frequency filter according to claim 5 , further comprising: a seventh voltage tunable dielectric varactor connected between the first resonator and the third resonator; an eighth voltage dielectric varactor connected between the third resonator and the fourth resonator; a ninth voltage tunable dielectric varactor connected between the fourth resonator and the second resonator.
Claim 8
Dependent Claim
102 words
A radio frequency filter according to claim 3 , wherein: the first micro strip resonator includes a first end and a second end, wherein the first end of the first micro strip resonator is connected to a ground and the second end of the first micro strip resonator is connected to the first voltage tunable dielectric varactor; and the second microstrip resonator includes a first end and a second end, wherein the first end of the second microstrip resonator is connected to the ground and the second end of the second microstrip resonator is connected to the second voltage tunable dielectric varactor.
Claim 9
Dependent Claim
36 words
A radio frequency filter according to claim 1 , further comprising: a third dielectric varactor coupled between the input and the first resonator; and a fourth dielectric varactor coupled between the output and the second resonator.
Claim 10
Dependent Claim
24 words
A radio frequency filter according to claim 8 , further comprising: a fifth dielectric varactor coupled between the first resonator and the second resonator.
Claim 11
Dependent Claim
111 words
A radio frequency filter according to claim 1 , wherein each of the varactors includes: a substrate; a first conductor positioned on a surface of the substrate; a second conductor positioned on the surface of the substrate forming a gap between the first and second conductors; a tunable dielectric material positioned on the surface of the substrate and within the gap, said tunable dielectric material having a top surface, at least a portion of said top surface being positioned above the gap opposite the surface of the substrate; and a first portion of the second conductor extending along at least a portion of the top surface of the tunable dielectric material.
Claim 12
Dependent Claim
31 words
A radio frequency filter according to claim 10 , wherein: a portion of the tunable dielectric material lies along a surface of the first conductor opposite the surface of the substrate.
Claim 13
Dependent Claim
28 words
A radio frequency filter according to claim 11 , wherein the first portion of the second conductor has a shape that is one of: rectangular, triangular, and trapezoidal.
Claim 14
Dependent Claim
91 words
A radio frequency filter according to claim 12 , wherein the tunable dielectric layer comprises one of: barium strontium titanate, barium calcium titanate, lead zirconium titanate, lead lanthanum zirconium titanate, lead titanate, barium calcium zirconium titanate, sodium nitrate, KNbO 3 , LiNbO 3 , LiTaO 3 , PbNb 2 O 6 , PbTa 2 O 6 , KSr(NbO 3 ), NaBa 2 (NbO 3 ) 5 , KH 2 PO 4 , and composites containing materials that enable low insertion loss and effective phase tuning at non-chilled temperatures, including room temperature.
Claim 15
Dependent Claim
31 words
A radio frequency filter according to claim 10 , wherein the substrate comprises one of: MgO, alumina (AL 2 O 3 ), LaAlO 3 , sapphire, quartz, silicon, and gallium arsenide.
Claim 16
Dependent Claim
24 words
A radio frequency filter according to claim 10 , wherein: the first portion of the second conductor overlaps a portion of the first conductor.
Claim 17
Dependent Claim
44 words
A radio frequency filter according to claim 10 , wherein the tunable dielectric layer comprises a barium strontium titanate (BSTO) composite selected from the group of: BSTO—MgO, BSTO—MgAl 2 O 4 , BSTO—CaTiO 3 , BSTO—MgTiO 3 , BSTO—MgSrZrTiO 6 , and combinations thereof.
Claim 18
Dependent Claim
21 words
A radio frequency filter according to claim 10 , wherein the first conductor comprises one of: platinum, platinum-rhodium, and ruthenium oxide.
Claim 19
Dependent Claim
23 words
A radio frequency filter according to claim 10 , wherein the second conductor comprises one of: gold, silver, copper, platinum, and ruthenium oxide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-02-02 | 2007-08-04 | 2008-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-02-02 | 2011-08-04 | 2012-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-02-02 | 2015-08-04 | 2016-02-03 | $7700.00 | Window Closed / Lapsed |