US6377440B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric varactors with offset two-layer electrodes
Assignee: NXP USA Inc
•
Filing: 2000-09-12
•
Granted: 2002-04-23
•
Expires: 2020-09-12
Abstract
Abstract A varactor comprising 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, the tunable dielectric material having a top surface, with 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. The second conductor can overlap or not overlap a portion of the first conductor.
Inventors
- 👤 Yongfei Zhu
- 👤 Louise C. Sengupta
- 👤 Xubai Zhang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:18
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/201; H10D84/204; H10D84/212; H10D84/215
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
99 words
A varactor comprising: 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 2
Dependent Claim
99 words
A varactor comprising: 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 3
Dependent Claim
28 words
The varactor of claim 1 , wherein: a portion of the tunable dielectric material lies along a surface of the first conductor opposite the surface of the substrate.
Claim 4
Dependent Claim
25 words
The varactor of claim 2 , wherein the first portion of the second conductor has a shape that is one of: rectangular, triangular, and trapezoidal.
Claim 5
Dependent Claim
72 words
The varactor of claim 3 , 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 thereof.
Claim 6
Dependent Claim
28 words
The varactor of claim 4 , wherein the substrate comprises one of: MgO, alumina (AL 2 O 3 ), LaAlO 3 , sapphire, quartz, silicon, and gallium arsenide.
Claim 7
Dependent Claim
21 words
The varactor of claim 5 , wherein: the first portion of the second conductor overlaps a portion of the first conductor.
Claim 8
Dependent Claim
41 words
The varactor of claim 3 , 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 9
Dependent Claim
28 words
The varactor of claim 7 , wherein the substrate comprises one of: MgO, alumina (AL 2 O 3 ), LaAlO 3 , sapphire, quartz, silicon, and gallium arsenide.
Claim 10
Dependent Claim
21 words
The varactor of claim 8 , wherein: the first portion of the second conductor overlaps a portion of the first conductor.
Claim 11
Dependent Claim
21 words
The varactor of claim 1 , wherein: the first portion of the second conductor overlaps a portion of the first conductor.
Claim 12
Dependent Claim
72 words
The varactor of claim 1 , 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 thereof.
Claim 13
Dependent Claim
41 words
The varactor of claim 1 , 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 14
Dependent Claim
28 words
The varactor of claim 1 , wherein the substrate comprises one of: MgO, alumina (AL 2 O 3 ), LaAlO 3 , sapphire, quartz, silicon, and gallium arsenide.
Claim 15
Dependent Claim
18 words
The varactor of claim 1 , wherein the first conductor comprises one of: platinum, platinum-rhodium, and ruthenium oxide.
Claim 16
Dependent Claim
20 words
The varactor of claim 14 , wherein the second conductor comprises one of: gold, silver, copper, platinum, and ruthenium oxide.
Claim 17
Dependent Claim
20 words
The varactor of claim 1 , wherein the second conductor comprises one of: gold, silver, copper, platinum, and ruthenium oxide.
References Cited (Backward Citations)
US3879645A
Cited
US5721194A
Cited
US5312790A
Cited
US5427988A
Cited
US5486491A
Cited
US5693429A
Cited
US6088216A
Cited
US5635434A
Cited
US5635433A
Cited
US5766697A
Cited
US5846893A
Cited
US5640042A
Cited
US5830591A
Cited
US6097263A
Cited
US6096127A
Cited
US6078494A
Cited
US6058005A
Cited
US6088214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-04-22 | 2005-10-22 | 2006-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-04-22 | 2009-10-22 | 2010-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-04-22 | 2013-10-22 | 2014-04-23 | $7700.00 | Window Closed / Lapsed |