US5431955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency conductive material and resonator and method for making
Assignee: TDK Corp
•
Filing: 1994-07-01
•
Granted: 1995-07-11
•
Expires: 2014-07-01
Abstract
Abstract Glass, an oxide aggregate with a positive τε and an oxide aggregate with a negative τε are mixed in a prescribed ratio by volume so as to bring the τε of a high-frequency dielectric material close to -12 ppm/°C. and bring the resonant frequency temperature coefficient τf of a high-frequency resonator near zero.
Inventors
- 👤 Keizou Kawamura
- 👤 Makoto Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:34
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/14; C03C4/00; C03C4/16; C03C8/20; H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/085; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
A high-frequency dielectric material comprising 50-80% by volume glass, and 50-20% by volume of a mixture of an oxide with a positive dielectric constant temperature coefficient τε and an oxide with a negative dielectric constant temperature coefficient τε, wherein said glass has the following composition: SiO 2 : 50-70 mol % Al 2 O 3 : 5-20 mol % B 2 O 3 : 0-10 mol % one or more alkaline earth metal oxides: 25-45 mol % and wherein the oxide with a positive τε is one or both of aluminum oxide and magnesium titanate and the oxide with a negative τε is one or more of calcium titanate, strontium titanate and titanium oxide, but wherein aluminum oxide and titanium oxide are not both present in said material.
Claim 2
Dependent Claim
128 words
A high-frequency dielectric material comprising 50-80% by volume glass, and 50-20% by volume of a mixture of an oxide with a positive dielectric constant temperature coefficient τε and an oxide with a negative dielectric constant temperature coefficient τε, wherein said glass has the following composition: SiO 2 : 50-70 mol % Al 2 O 3 : 5-20 mol % B 2 O 3 : 0-10 mol % one or more alkaline earth metal oxides: 25-45 mol % and wherein the oxide with a positive τε is one or both of aluminum oxide and magnesium titanate and the oxide with a negative τε is one or more of calcium titanate, strontium titanate and titanium oxide, but wherein aluminum oxide and titanium oxide are not both present in said material.
Claim 3
Dependent Claim
43 words
A high-frequency dielectric material according to claim 1, which contains calcium titanate as the oxide with a negative τε and magnesium titanate or aluminum oxide as the oxide with a positive τε, the calcium titanate content of the oxides being 5-20% by volume.
Claim 4
Dependent Claim
43 words
A high-frequency dielectric material according to claim 1, which contains strontium titanate as the oxide with a negative τε and magnesium titanate or aluminum oxide as the oxide with a positive τε, the strontium titanate content of the oxides being 2-10% by volume.
Claim 5
Dependent Claim
40 words
A high-frequency dielectric material according to claim 1, which contains titanium oxide as the oxide with a negative τε and magnesium titanate as the oxide with a positive τε, the titanium oxide content of the oxides being 10-20% by volume.
Claim 6
Dependent Claim
47 words
A high-frequency dielectric material according to any of claims 1 to 4, wherein the dielectric constant temperature coefficient τε of the glass at 2 GHz, -40°-125° C. is 150-170 ppm/°C. and the mean coefficient of thermal expansion thereof at 40°-290° C. is 5.5-6.5×10 -6 deg -1 .
Claim 7
Dependent Claim
23 words
A high-frequency dielectric material according to any of claims 1 to 4, wherein the dielectric constant temperature coefficient τε thereof is -40-+20 ppm/°C.
Claim 8
Dependent Claim
38 words
A high-frequency dielectric material according to any of claims 1 to 4, wherein the glass content is 50-80% by volume based on the total of oxides and glass and the softening point of the glass is 700°-900° C.
Claim 9
Dependent Claim
32 words
A resonator comprising laminated dielectric layers formed from a high-frequency dielectric material according to any one of claims 2 to 5 and having at least a strip line between the dielectric layers.
Claim 10
Independent Claim
124 words
A method of producing a resonator comprising the steps of: providing glass having a dielectric constant temperature coefficient τε at 2 GHz, -40°-125° C. of 150-170 ppm/°C. and a mean coefficient of thermal expansion at 40°-290° C. of 5.5-6.5×10 -6 deg -1 , aluminum oxide and titanium oxide, mixing said glass, aluminum oxide and titanium oxide together to obtain a high-frequency dielectric material wherein the amount of glass/(glass+oxide) is 50-80% by volume and the amount of titanium oxide/(titanium oxide+aluminum oxide) is 40-60% by volume, and forming a laminate of dielectric layers having a dielectric constant temperature coefficient τε of -40-+20 ppm/°C. with said high-frequency dielectric material, forming a strip line of conductive material in the laminate, and sintering the result to obtain a resonator.
Claim 11
Independent Claim
124 words
A method of producing a resonator comprising the steps of: providing glass having a dielectric constant temperature coefficient τε at 2 GHz, -40°-125° C. of 150-170 ppm/°C. and a mean coefficient of thermal expansion at 40°-290° C. of 5.5-6.5×10 -6 deg -1 , aluminum oxide and titanium oxide, mixing said glass, aluminum oxide and titanium oxide together to obtain a high-frequency dielectric material wherein the amount of glass/(glass+oxide) is 50-80% by volume and the amount of titanium oxide/(titanium oxide+aluminum oxide) is 40-60% by volume, and forming a laminate of dielectric layers having a dielectric constant temperature coefficient τε of -40-+20 ppm/°C. with said high-frequency dielectric material, forming a strip line of conductive material in the laminate, and sintering the result to obtain a resonator.
Claim 12
Dependent Claim
58 words
A method of producing a resonator according to claim 9, wherein the composition of the glass is SiO 2 : 50-70 mol %, Al 2 O 3 : 5-20 mol % B 2 O 3 : 0-10 mol % and one or more alkaline earth metal oxides: 25-45 mol %, and the softening point thereof is 700°-900° C.
Claim 13
Dependent Claim
26 words
The method of claim 9, wherein said glass, aluminum oxide and titanium oxide are mixed together to form a slurry in the presence of a vehicle.
References Cited (Backward Citations)
JPS5454300A
Cited
US4335216A
Cited
JPS603801A
Cited
US4699891A
Cited
US4775649A
Cited
US4777092A
Cited
JPS632204A
Cited
EP0396155A2
Cited
JPS63291307A
Cited
JPS6445743A
Cited
JPS6451346A
Cited
US5229213A
Cited
JPH0345556A
Cited
US5093291A
Cited
EP0468801A2
Cited
JPH0482297A
Cited
US5137848A
Cited
US5242867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-10 | 1999-01-09 | 1999-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-10 | 2003-01-09 | 2003-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-10 | 2007-01-09 | 2007-07-11 | $7700.00 | Window Closed / Lapsed |