US5916834A
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Dielectric ceramics
Assignee: Kyocera Corp
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Filing: 1997-12-29
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Granted: 1999-06-29
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Expires: 2017-12-29
Abstract
Abstract Dielectric ceramics comprising 85 to 99.95% by weight of a Zn-containing composite oxide of which the composition of constituent metals is represented by the following formula (1) as expressed by atomic ratios:a(Zn1-xxMgx)xb(Ti1-yxSiy)(1)wherein x, y, a and b are numbers satisfying the following conditions, 0</=x</=0.75 0</=y</=1 0.14</=a/b</=3.5 where a/b NOTEQUAL 1 when x=y=0, and 0.05 to 15% by weight of B2O3, and exhibiting a dielectric loss tangent at 30 to 60 GHz of not larger than 30x10-4. The dielectric ceramics have a small dielectric loss tangent in a high-frequency region, can be obtained upon being fired together with low-resistance metals such as copper or silver, and can be very effectively utilized as the wiring boards of various electronic equipment adapted for use at high frequencies.
Inventors
- 👤 Yoshitake Terashi
- 👤 Nobuya Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/20; C04B35/46; C04B35/462; C04B35/465; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
Dielectric ceramics comprising 85 to 99.95% by weight of a Zn-containing composite oxide of which the composition of constituent metals is represented by the following formula (1) as expressed by atomic ratios: a(Zn.sub.1-x ·Mg.sub.x)·b(Ti.sub.1-y ·Si.sub.y)(1) wherein x, y, a and b are numbers satisfying the following conditions, 0≦x≦0.75 0≦y≦1 0.14≦a/b≦3.5 where a/b≠1 when x=y=0, and 0.05 to 15% by weight of B 2 O 3 , and exhibiting a dielectric loss tangent at 30 to 60 GHz of not larger than 30×10 -4 .
Claim 2
Dependent Claim
84 words
Dielectric ceramics comprising 85 to 99.95% by weight of a Zn-containing composite oxide of which the composition of constituent metals is represented by the following formula (1) as expressed by atomic ratios: a(Zn.sub.1-x ·Mg.sub.x)·b(Ti.sub.1-y ·Si.sub.y)(1) wherein x, y, a and b are numbers satisfying the following conditions, 0≦x≦0.75 0≦y≦1 0.14≦a/b≦3.5 where a/b≠1 when x=y=0, and 0.05 to 15% by weight of B 2 O 3 , and exhibiting a dielectric loss tangent at 30 to 60 GHz of not larger than 30×10 -4 .
Claim 3
Dependent Claim
73 words
Dielectric ceramics according to claim 1, wherein said Zn-containing composite oxide has a composition of the formula (1) in which x and y satisfy the following conditions, 0<x≦0.75 y=0 and said dielectric ceramics contains an ilmenite crystal phase or a spinel crystal phase, and exhibits a dielectric constant of not smaller than 15 and a dielectric loss tangent of not larger than 15×10 -4 in a region of from 30 to 60 GHz.
Claim 4
Dependent Claim
14 words
Dielectric ceramics according to claim 2, further containing a rutile TiO 2 crystal phase.
Claim 5
Dependent Claim
95 words
Dielectric ceramics according to claim 1, wherein said Zn-containing composite oxide has a composition of the formula (1) in which x and y satisfy the following condition, x=y=0 and said dielectric ceramics contains at least two kinds of crystal phases selected from the group consisting of a spinel crystal phase, an ilmenite crystal phase, a rutile TiO 2 crystal phase and a ZnO crystal phase, and has a dielectric constant of not smaller than 15 and a dielectric loss tangent of not larger than 15×10 -4 in a region of from 30 to 60 GHz.
Claim 6
Dependent Claim
74 words
Dielectric ceramics according to claim 1, wherein said Zn-containing composite oxide has a composition of the formula (1) in which x and y satisfy the following conditions, x=0 y=1 and said dielectric ceramics contains a willemite crystal phase or an SiO 2 crystal phase, and exhibits a dielectric constant of not larger than 6 and a dielectric loss tangent of not larger than 15×10 -4 in a region of from 30 to 60 GHz.
Claim 7
Dependent Claim
101 words
Dielectric ceramics according to claim 1, wherein said Zn-containing composite oxide has a composition of the formula (1) in which x and y satisfy the following conditions, 0<x≦0.75 0<y<1.0 and said dielectric ceramics contains at least one kind of crystal phase selected from the group consisting of a willemite crystal phase, an ilmenite crystal phase, a spinel crystal phase, a rutile TiO 2 crystal phase and an SiO 2 crystal phase, and exhibits a dielectric constant of from 5 to 80 and a dielectric loss tangent of not larger than 20×10 -4 in a region of from 30 to 60 GHz.
Claim 8
Dependent Claim
101 words
Dielectric ceramics according to claim 1, wherein said Zn-containing composite oxide has a composition of the formula (1) in which x and y satisfy the following conditions, x=0 0<y<1.0 and said dielectric ceramics contains at least one kind of crystal phase selected from the group consisting of a willemite crystal phase, an ilmenite crystal phase, a spinel crystal phase, a rutile TiO 2 crystal phase and an SiO 2 crystal phase, and exhibits a dielectric constant of from 5 to 80 and a dielectric loss tangent of not larger than 30×10 -4 in a region of from 30 to 60 GHz.
Claim 9
Dependent Claim
92 words
Dielectric ceramics comprising 70 to 99.9% by weight of a Zn-containing composite oxide of which the composition of constituent metals is represented by the following formula (1) as expressed by atomic ratios: a(Zn.sub.1-x ·Mg.sub.x)·b(Ti.sub.1-y ·Si.sub.y)(1) wherein x, y, a and b are numbers satisfying the following conditions, 0≦x≦0.75 0≦y≦1 0.14≦a/b≦3.5 where a/b≠1 when x=y=0, and 0.1 to 30% by weight of a glass containing at least SiO 2 and B 2 O 3 , and exhibiting a dielectric loss tangent at 30 to 60 GHz of not larger than 30×10 -4 .
Claim 10
Dependent Claim
92 words
Dielectric ceramics comprising 70 to 99.9% by weight of a Zn-containing composite oxide of which the composition of constituent metals is represented by the following formula (1) as expressed by atomic ratios: a(Zn.sub.1-x ·Mg.sub.x)·b(Ti.sub.1-y ·Si.sub.y)(1) wherein x, y, a and b are numbers satisfying the following conditions, 0≦x≦0.75 0≦y≦1 0.14≦a/b≦3.5 where a/b≠1 when x=y=0, and 0.1 to 30% by weight of a glass containing at least SiO 2 and B 2 O 3 , and exhibiting a dielectric loss tangent at 30 to 60 GHz of not larger than 30×10 -4 .
Claim 11
Dependent Claim
73 words
Dielectric ceramics according to claim 8, wherein said Zn-containing composite oxide has a composition of the formula (1) in which x and y satisfy the following conditions, 0<x≦0.75 y=0 and said dielectric ceramics contains an ilmenite crystal phase or a spinel crystal phase, and exhibits a dielectric constant of not smaller than 15 and a dielectric loss tangent of not larger than 15×10 -4 in a region of from 30 to 60 GHz.
Claim 12
Dependent Claim
14 words
Dielectric ceramics according to claim 9, further containing a rutile TiO 2 crystal phase.
Claim 13
Dependent Claim
95 words
Dielectric ceramics according to claim 8, wherein said Zn-containing composite oxide has a composition of the formula (1) in which x and y satisfy the following condition, x=y=0 and said dielectric ceramics contains at least two kinds of crystal phases selected from the group consisting of a spinel crystal phase, an ilmenite crystal phase, a rutile TiO 2 crystal phase and a ZnO crystal phase, and has a dielectric constant of not smaller than 15 and a dielectric loss tangent of not larger than 15×10 -4 in a region of from 30 to 60 GHz.
Claim 14
Dependent Claim
74 words
Dielectric ceramics according to claim 8, wherein said Zn-containing composite oxide has a composition of the formula (1) in which x and y satisfy the following conditions, x=0 y=1 and said dielectric ceramics contains a willemite crystal phase or an SiO 2 crystal phase, and exhibits a dielectric constant of not larger than 6 and a dielectric loss tangent of not larger than 15×10 -4 in a region of from 30 to 60 GHz.
Claim 15
Dependent Claim
101 words
Dielectric ceramics according to claim 8, wherein said Zn-containing composite oxide has a composition of the formula (1) in which x and y satisfy the following conditions, 0<x≦0.75 0<y<1.0 and said dielectric ceramics contains at least one kind of crystal phase selected from the group consisting of a willemite crystal phase, an ilmenite crystal phase, a spinel crystal phase, a rutile TiO 2 crystal phase and an SiO 2 crystal phase, and exhibits a dielectric constant of from 5 to 80 and a dielectric loss tangent of not larger than 20×10 -4 in a region of from 30 to 60 GHz.
Claim 16
Dependent Claim
101 words
Dielectric ceramics according to claim 8, wherein said Zn-containing composite oxide has a composition of the formula (1) in which x and y satisfy the following conditions, x=0 0<y<1.0 and said dielectric ceramics contains at least one kind of crystal phase selected from the group consisting of a willemite crystal phase, an ilmenite crystal phase, a spinel crystal phase, a rutile TiO 2 crystal phase and an SiO 2 crystal phase, and exhibits a dielectric constant of from 5 to 80 and a dielectric loss tangent of not larger than 30×10 -4 in a region of from 30 to 60 GHz.
References Cited (Backward Citations)
US5767030A
Cited
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