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US5310710A
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Microwave dielectric ceramic composition
Assignee: Niterra Co Ltd
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Filing: 1992-04-06
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Granted: 1994-05-10
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Expires: 2012-04-06
Abstract
Abstract A dielectric ceramic composition which comprises a composition represented by xBaO.yNd 2 O 3 .zTiO 2 (where 8.5≦x≦20, 5≦y≦23, 62≦z≦85, and x+y+z=100), Y 2 O 3 in an amount not more than 15 wt % of the amount of said composition, and Al 2 O 3 in an amount not more than 2 wt % of the total amount of the principal components BaO, Nd 2 O 3 , TiO 2 , and Y 2 O 3 . And a relative permittivity εr of the dielectric ceramic is not less than 59, its dielectric loss (tan δ) is 3×10 -4 ˜8×10 -4 (2.7 GHz), and its temperature coefficient of resonant frequency τf may be -30˜+10 ppm/°C. This microwave ceramic dielectric will be used for dielectric resonators in the microwave frequency region, microwave IC substrates, and impedance matching of microwave circuits.
Inventors
- 👤 Masanori Takase
- 👤 Hirofumi Ozeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:21
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A microwave dielectric ceramic composition which comprises a composition represented by xBaO.yNd 2 O 3 .zTiO 2 (where 8.5<x<20 mol %, 5<y<23 mol %, 62<z<85 mol %, and x+y+z=100 mol %), Y 2 O 3 in an amount of 5 to 15 wt % of the amount of said composition, and Al 2 O 3 in an amount of 0.1 to 2 wt % of the total amount of the principal components BaO, Nd 2 O 3 , TiO 2 , and Y 2 O 3 .
Claim 2
Dependent Claim
87 words
A microwave dielectric ceramic composition which comprises a composition represented by xBaO.yNd 2 O 3 .zTiO 2 (where 8.5<x<20 mol %, 5<y<23 mol %, 62<z<85 mol %, and x+y+z=100 mol %), Y 2 O 3 in an amount of 5 to 15 wt % of the amount of said composition, and Al 2 O 3 in an amount of 0.1 to 2 wt % of the total amount of the principal components BaO, Nd 2 O 3 , TiO 2 , and Y 2 O 3 .
Claim 3
Dependent Claim
15 words
A microwave dielectric ceramic composition as defined in claim 1, wherein 17.0≦x≦19.5, 10≦y≦16, and 67≦z≦72.
Claim 4
Dependent Claim
22 words
A microwave dielectric ceramic composition as defined in claim 1, wherein the amount of Y 2 O 3 is 5-9 wt %.
Claim 5
Dependent Claim
22 words
A microwave dielectric ceramic composition as defined in claim 2, wherein the amount of Y 2 O 3 is 5-9 wt %.
Claim 6
Dependent Claim
24 words
A microwave dielectric ceramic composition as defined in one of claims 1-4, wherein the amount of Al 2 O 3 is 0.1-0.5 wt %.
Claim 7
Dependent Claim
125 words
A microwave dielectric ceramic composition which comprises a composition represented by xBaO.yNd 2 O 3 .zTiO 2 (where 8.5<x<20 mol %, 5<y<23 mol %, 62<z<85 mol %, and x+y+z=100 mol %), Y 2 O 3 in an amount of 5 to 9 wt % of the amount of said composition, and Al 2 O 3 in an amount of 0.1 to 0.5 wt % of the total amount of the principal components BaO, Nd 2 O 3 , TiO 2 , and Y 2 O 3 , and a relative permittivity εr is not less than 59, a dielectric loss (tan δ) is 3×10 -4 to about 8×10 -4 (2.7 GHz), and a temperature coefficient of resonant frequency is τf -30 to about +10 ppm/°C.
Claim 8
Dependent Claim
125 words
A microwave dielectric ceramic composition which comprises a composition represented by xBaO.yNd 2 O 3 .zTiO 2 (where 8.5<x<20 mol %, 5<y<23 mol %, 62<z<85 mol %, and x+y+z=100 mol %), Y 2 O 3 in an amount of 5 to 9 wt % of the amount of said composition, and Al 2 O 3 in an amount of 0.1 to 0.5 wt % of the total amount of the principal components BaO, Nd 2 O 3 , TiO 2 , and Y 2 O 3 , and a relative permittivity εr is not less than 59, a dielectric loss (tan δ) is 3×10 -4 to about 8×10 -4 (2.7 GHz), and a temperature coefficient of resonant frequency is τf -30 to about +10 ppm/°C.
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