US4121941A
Expired / Lapsed
US
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Low microwave loss ceramics and method of manufacturing the same
Assignee: Panasonic Holdings Corp
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Filing: 1977-11-10
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Granted: 1978-10-24
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Expires: 1997-11-10
Abstract
Abstract Calcined material having a composition including at least two of the components 3BaO.ZnO.Nb2O5, 3BaO.ZnO.Ta2O5, 3BaO.MgO.Nb2O5, and 3BaO.MgO.Ta2O5 and produced under optimum processing conditions as disclosed is employed for obtaining ceramics having low microwave loss with large dielectric constant and suitable for use as dielectric resonators, electrical filters, substrates, etc.
Inventors
- 👤 Syunichiro Kawashima
- 👤 Masamitsu Nishida
- 👤 Ichiro Ueda
- 👤 Hiromu Ouchi
- 👤 Shigeru Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:11
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
62 words
A low microwave loss ceramic consisting essentially of a solid solution represented by the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-x(3BaO.ZnO.Ta.sub.2 O.sub.5) where w and x represent mole fraction and 0.01 ≦ w ≦ 0.99, 0.01 ≦ x ≦ 0.99 and w + x = 1, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution.
Claim 2
Dependent Claim
62 words
A low microwave loss ceramic consisting essentially of a solid solution represented by the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-x(3BaO.ZnO.Ta.sub.2 O.sub.5) where w and x represent mole fraction and 0.01 ≦ w ≦ 0.99, 0.01 ≦ x ≦ 0.99 and w + x = 1, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution.
Claim 3
Dependent Claim
61 words
A low microwave loss ceramic consisting essentially of a solid represented by the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-y(3BaO.MgO.Nb.sub.2 O.sub.5) where w and y represent mole fraction and 0.01 ≦ w ≦ 0.99, 0.01 ≦ y ≦ 0.99 and w + y = 1, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution.
Claim 4
Dependent Claim
61 words
A low microwave loss ceramic consisting essentially of a solid represented by the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-y(3BaO.MgO.Nb.sub.2 O.sub.5) where w and y represent mole fraction and 0.01 ≦ w ≦ 0.99, 0.01 ≦ y ≦ 0.99 and w + y = 1, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution.
Claim 5
Dependent Claim
62 words
A low microwave loss ceramic consisting essentially of a solid solution represented by the formula x(3BaO.ZnO.Ta.sub.2 O.sub.5)-z(3BaO.MgO.Ta.sub.2 O.sub.5) where x and z represent mole fraction and 0.01 ≦ x ≦ 0.99, 0.01 ≦ z ≦ 0.99 and x + z = 1, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution.
Claim 6
Dependent Claim
62 words
A low microwave loss ceramic consisting essentially of a solid solution represented by the formula x(3BaO.ZnO.Ta.sub.2 O.sub.5)-z(3BaO.MgO.Ta.sub.2 O.sub.5) where x and z represent mole fraction and 0.01 ≦ x ≦ 0.99, 0.01 ≦ z ≦ 0.99 and x + z = 1, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution.
Claim 7
Dependent Claim
63 words
A low microwave loss ceramic consisting essentially of a solid solution represented by the formula y(3BaO.MgO.Nb.sub.2 O.sub.5)-z(3BaO.MgO.Ta.sub.2 O.sub.5) where y and z represent mole fraction and 0.01 ≦ y ≦ 0.99 , 0.01 ≦ z ≦ 0.99 and y + z = 1, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution.
Claim 8
Dependent Claim
63 words
A low microwave loss ceramic consisting essentially of a solid solution represented by the formula y(3BaO.MgO.Nb.sub.2 O.sub.5)-z(3BaO.MgO.Ta.sub.2 O.sub.5) where y and z represent mole fraction and 0.01 ≦ y ≦ 0.99 , 0.01 ≦ z ≦ 0.99 and y + z = 1, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution.
Claim 9
Dependent Claim
77 words
A low microwave loss ceramic consisting essentially of a solid solution represented by the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-x(3BaO.ZnO.Ta.sub.2 O.sub.5)-y(3BaO.MgO.Nb.sub.2 O.sub.5)-z(3BaO.MgO.Ta.sub.2 O.sub.5) where w, x, y and z represent mole fractions and 0.01 ≦ w ≦ 0.97, 0.01 ≦ x ≦ 0.97, 0.01 ≦ y ≦ 0.97 and 0.01 ≦ z ≦ 0.97 and w + x + y + z = 1, said ceramic having an unloaded Q value higher than that of each of the individual components
Claim 10
Dependent Claim
77 words
A low microwave loss ceramic consisting essentially of a solid solution represented by the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-x(3BaO.ZnO.Ta.sub.2 O.sub.5)-y(3BaO.MgO.Nb.sub.2 O.sub.5)-z(3BaO.MgO.Ta.sub.2 O.sub.5) where w, x, y and z represent mole fractions and 0.01 ≦ w ≦ 0.97, 0.01 ≦ x ≦ 0.97, 0.01 ≦ y ≦ 0.97 and 0.01 ≦ z ≦ 0.97 and w + x + y + z = 1, said ceramic having an unloaded Q value higher than that of each of the individual components
Claim 11
Dependent Claim
123 words
in the solid solution. 6. A method of making a low microwave loss ceramic of the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-x(3BaO.ZnO.Ta.sub.2 O.sub.5) (0.01 ≦ w ≦ 0.99, 0.01 ≦ x ≦ 0.99 and w + x = 1) in solid solution, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution, said method comprising the steps of; calcining a mixture of the oxides, hydroxides, or carbonates of the metals to be contained in the ceramic to form a solid solution, at 1,000° C. to 1,400° C., for a period of at least 30 minutes; and then hot-pressing at a pressure of at least 50 kg/cm 2 , at 1,100° C. to 1,450° C., for a
Claim 12
Dependent Claim
123 words
in the solid solution. 6. A method of making a low microwave loss ceramic of the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-x(3BaO.ZnO.Ta.sub.2 O.sub.5) (0.01 ≦ w ≦ 0.99, 0.01 ≦ x ≦ 0.99 and w + x = 1) in solid solution, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution, said method comprising the steps of; calcining a mixture of the oxides, hydroxides, or carbonates of the metals to be contained in the ceramic to form a solid solution, at 1,000° C. to 1,400° C., for a period of at least 30 minutes; and then hot-pressing at a pressure of at least 50 kg/cm 2 , at 1,100° C. to 1,450° C., for a
Claim 13
Dependent Claim
125 words
period of at least 30 minutes. 7. A method of making a low microwave loss ceramic of the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-y(3BaO.MgO.Nb.sub.2 O.sub.5) (0.01 ≦ w ≦ 0.99, 0.01 ≦ y ≦ 0.99 and w + y = 1) in solid solution, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution, said method comprising the steps of; calcining a mixture of the oxides, hydroxides, or carbonates of the metals to be contained in the ceramic to form a solid solution at 1,000° C. to 1,400° C., for a period of at least 30 minutes; and then hot-pressing at a pressure of at least 50 kg/cm 2 , at 1,100° C. to 1,450° C., for a
Claim 14
Dependent Claim
125 words
period of at least 30 minutes. 7. A method of making a low microwave loss ceramic of the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-y(3BaO.MgO.Nb.sub.2 O.sub.5) (0.01 ≦ w ≦ 0.99, 0.01 ≦ y ≦ 0.99 and w + y = 1) in solid solution, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution, said method comprising the steps of; calcining a mixture of the oxides, hydroxides, or carbonates of the metals to be contained in the ceramic to form a solid solution at 1,000° C. to 1,400° C., for a period of at least 30 minutes; and then hot-pressing at a pressure of at least 50 kg/cm 2 , at 1,100° C. to 1,450° C., for a
Claim 15
Dependent Claim
126 words
period of at least 30 minutes. 8. A method of making a low microwave loss ceramic of the formula x(3BaO.ZnO.Ta.sub.2 O.sub.5)- z(3BaO.MgO.Ta.sub.2 O.sub.5) (0.01 ≦ x ≦ 0.99, 0.01 ≦ z ≦ 0.99 and x + z = 1) in solid solution, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution, said method comprising the steps of; calcining a mixture of the oxides, hydroxides, or carbonates of the metals to be contained in the ceramic to form a solid solution, at 1,000° C. to 1,400° C., for a period of at least 30 minutes; and then hot-pressing at a pressure of at least 50 kg/cm 2 , at 1,100° C. to 1,450° C., for a
Claim 16
Dependent Claim
126 words
period of at least 30 minutes. 8. A method of making a low microwave loss ceramic of the formula x(3BaO.ZnO.Ta.sub.2 O.sub.5)- z(3BaO.MgO.Ta.sub.2 O.sub.5) (0.01 ≦ x ≦ 0.99, 0.01 ≦ z ≦ 0.99 and x + z = 1) in solid solution, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution, said method comprising the steps of; calcining a mixture of the oxides, hydroxides, or carbonates of the metals to be contained in the ceramic to form a solid solution, at 1,000° C. to 1,400° C., for a period of at least 30 minutes; and then hot-pressing at a pressure of at least 50 kg/cm 2 , at 1,100° C. to 1,450° C., for a
Claim 17
Dependent Claim
125 words
period of at least 30 minutes. 9. A method of making a low microwave loss ceramic of the formula y(3BaO.MgO.Nb.sub.2 O.sub.5)-z(3BaO.MgO.Ta.sub.2 O.sub.5) (0.01 ≦ y ≦ 0.99, 0.01 ≦ z ≦ 0.99 and y + z = 1) in solid solution, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution, said method comprising the steps of; calcining a mixture of the oxides, hydroxides, or carbonates of the metals to be contained in the ceramic to form a solid solution, at 1,000° C. to 1,400° C., for a period of at least 30 minutes; and then hot-pressing at a pressure of at least 50 kg/cm 2 , at 1,100° C. to 1,450° C., for a
Claim 18
Dependent Claim
125 words
period of at least 30 minutes. 9. A method of making a low microwave loss ceramic of the formula y(3BaO.MgO.Nb.sub.2 O.sub.5)-z(3BaO.MgO.Ta.sub.2 O.sub.5) (0.01 ≦ y ≦ 0.99, 0.01 ≦ z ≦ 0.99 and y + z = 1) in solid solution, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution, said method comprising the steps of; calcining a mixture of the oxides, hydroxides, or carbonates of the metals to be contained in the ceramic to form a solid solution, at 1,000° C. to 1,400° C., for a period of at least 30 minutes; and then hot-pressing at a pressure of at least 50 kg/cm 2 , at 1,100° C. to 1,450° C., for a
Claim 19
Dependent Claim
148 words
period of at least 30 minutes. 10. A method of making a low microwave loss ceramic of the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-x(3BaO.ZnO.Ta.sub.2 O.sub.5)-y(3BaO.MgO.Nb.sub.2 O.sub.5)-z(3BaO.MgO.Ta.sub.2 O.sub.5) (0.01 ≦ w ≦ 0.97, 0.01 ≦ x ≦ 0.97, 0.01 ≦ y ≦ 0.97 and 0.01 ≦ z ≦ 0.97 and w + x + y + z = 1) in solid solution, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution, said method comprising the steps of; calcining a mixture of the oxides, hydroxides, or carbonates of the metals to be contained in the ceramic to form a solid solution, at 1,000° C. to 1,400° C., for a period of at least 30 minutes; and then hot-pressing at a pressure of at least 50 kg/cm 2 , at 1,100° C. to 1,450° C., for a period of at least 30 minutes.
Claim 20
Dependent Claim
148 words
period of at least 30 minutes. 10. A method of making a low microwave loss ceramic of the formula w(3BaO.ZnO.Nb.sub.2 O.sub.5)-x(3BaO.ZnO.Ta.sub.2 O.sub.5)-y(3BaO.MgO.Nb.sub.2 O.sub.5)-z(3BaO.MgO.Ta.sub.2 O.sub.5) (0.01 ≦ w ≦ 0.97, 0.01 ≦ x ≦ 0.97, 0.01 ≦ y ≦ 0.97 and 0.01 ≦ z ≦ 0.97 and w + x + y + z = 1) in solid solution, said ceramic having an unloaded Q value higher than that of each of the individual components in the solid solution, said method comprising the steps of; calcining a mixture of the oxides, hydroxides, or carbonates of the metals to be contained in the ceramic to form a solid solution, at 1,000° C. to 1,400° C., for a period of at least 30 minutes; and then hot-pressing at a pressure of at least 50 kg/cm 2 , at 1,100° C. to 1,450° C., for a period of at least 30 minutes.
References Cited (Backward Citations)
US3464785A
Cited
US3713051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |