US4487842A
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US
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Low-loss microwave dielectric material
Assignee: Japan Broadcasting Corp
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Filing: 1983-05-18
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Granted: 1984-12-11
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Expires: 2003-05-18
Abstract
Abstract A low-loss microwave dielectric material comprising a sinter of a mixture of a perovskite type structure compound oxide comprising singly or mainly Ba(Zn1/3Ta2/3)O3 and Ba(Mg1/3Ta2/3)O3 with a small amount of Mn. Mn addition not only favorably affects sinterability to lower the required sintering temperature but also advantageously heightens the unloaded Q factor of the resulting sinter in an SHF band.
Inventors
- 👤 Shoichiro Nomura
- 👤 Yoshihiro Konishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:49
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
71 words
A low-loss microwave dielectric ceramic consisting essentially of a sinter of a mixture of a perovskite type structure compound oxide having a porosity in the range of 1 to 3% consisting essentially solely or mainly of at least one member selected from the group consisting of Ba(Zn 1/3 Ta 2/3 )O 3 and Ba(Mg 1/3 Ta 2/3 )O 3 with Mn having an amount within the range of 0.5-5 mol %.
Claim 2
Dependent Claim
71 words
A low-loss microwave dielectric ceramic consisting essentially of a sinter of a mixture of a perovskite type structure compound oxide having a porosity in the range of 1 to 3% consisting essentially solely or mainly of at least one member selected from the group consisting of Ba(Zn 1/3 Ta 2/3 )O 3 and Ba(Mg 1/3 Ta 2/3 )O 3 with Mn having an amount within the range of 0.5-5 mol %.
Claim 3
Dependent Claim
23 words
A low-loss microwave dielectric ceramic as claimed in claim 1, wherein the amount of Mn is within the range of 0.5-2 mol %.
Claim 4
Dependent Claim
49 words
A low-loss microwave dielectric ceramic as claimed in claim 1, wherein said perovskite type structure compound oxide further contains less than 25 mol % of at least one member selected from the group consisting of Ba(Zn 1/3 Nb 2/3 )O 3 and Ba(Mg 1/3 Nb 2/3 )O 3 .
Claim 5
Dependent Claim
34 words
A low-loss microwave dielectric ceramic as claimed in claim 1, wherein said sinter is one prepared in a sintering atmosphere of at least one member selected from the group consisting of nitrogen and air.
Claim 6
Dependent Claim
34 words
A low-loss microwave dielectric ceramic as claimed in claim 3, wherein said sinter is one prepared in a sintering atmosphere of at least one member selected from the group consisting of nitrogen and air.
Claim 7
Dependent Claim
31 words
A low-loss microwave dielectric ceramic as claimed in claim 1, wherein said Mn is obtained from at least one member selected from the group consisting of manganese oxides and manganese carbonates.
Claim 8
Dependent Claim
31 words
A low-loss microwave dielectric ceramic as claimed in claim 3, wherein said Mn is obtained from at least one member selected from the group consisting of manganese oxides and manganese carbonates.
Claim 9
Dependent Claim
40 words
A low-loss microwave dielectric ceramic as claimed in claim 1, wherein said perovskite type structure compound oxide is a calcined powder mixed with said small amount of Mn derived from an aqueous treating solution of MnSO 4 .4H 2 O.
Claim 10
Dependent Claim
40 words
A low-loss microwave dielectric ceramic as claimed in claim 3, wherein said perovskite type structure compound oxide is a calcined powder mixed with said small amount of Mn derived from an aqueous treating solution of MnSO 4 .4H 2 O.
Claim 11
Dependent Claim
101 words
A process for preparing a low-loss microwave dielectric ceramic comprising the steps of: (1) adding a small amount from 0.5 to 5 mol % of Mn to a perovskite type structure compound oxide powder consisting essentially singly or mainly of at least one member selected from the group consisting of Ba(Zn 1/3 Ta 2/3 )O 3 and Ba(Mg 1/3 Ta 2/3 )O 3 (2) calcining the resultant mixture under a temperature within a range of 1200°-1400° C. to form Mn-treated oxide powder, and (3) sintering said Mn-treated oxide powder at a temperature within a range of 1550°-1600° C. for 1-3 hours.
Claim 12
Dependent Claim
101 words
A process for preparing a low-loss microwave dielectric ceramic comprising the steps of: (1) adding a small amount from 0.5 to 5 mol % of Mn to a perovskite type structure compound oxide powder consisting essentially singly or mainly of at least one member selected from the group consisting of Ba(Zn 1/3 Ta 2/3 )O 3 and Ba(Mg 1/3 Ta 2/3 )O 3 (2) calcining the resultant mixture under a temperature within a range of 1200°-1400° C. to form Mn-treated oxide powder, and (3) sintering said Mn-treated oxide powder at a temperature within a range of 1550°-1600° C. for 1-3 hours.
Claim 13
Dependent Claim
47 words
A process as claimed in claim 10, wherein said perovskite type structure compound oxide powder further comprises less than 25 mol % of at least one member selected from the group consisting of Ba(Zn 1/3 Nb 2/3 )O 3 and Ba(Mg 1/3 Nb 2/3 )O 3 .
Claim 14
Dependent Claim
31 words
A process as claimed in claim 10, wherein said sintering is carried out in a sintering atmosphere of at least one member selected from the group consisting of nitrogen and air.
Claim 15
Dependent Claim
31 words
A process as claimed in claim 11, wherein said sintering is carried out in a sintering atmosphere of at least one member selected from the group consisting of nitrogen and air.
Claim 16
Dependent Claim
31 words
A process as claimed in claim 10, wherein said small amount of Mn is obtained from at least one member selected from the group consisting of manganese oxides and manganese carbonates.
Claim 17
Dependent Claim
31 words
A process as claimed in claim 11, wherein said small amount of Mn is obtained from at least one member selected from the group consisting of manganese oxides and manganese carbonates.
Claim 18
Dependent Claim
50 words
A process as claimed in claim 10, wherein said perovskite type structure compound oxide is a calcined powder, and wherein said small amount of Mn is added to said perovskite type structure compound oxide by treating said calcined powder with an aqueous treating solution of MnSO 4 .4H 2 O.
Claim 19
Dependent Claim
50 words
A process as claimed in claim 11, wherein said perovskite type structure compound oxide is a calcined powder, and wherein said small amount of Mn is added to said perovskite type structure compound oxide by treating said calcined powder with an aqueous treating solution of MnSO 4 .4H 2 O.
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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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |