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US 5,310,710 AGranted
Microwave dielectric ceramic composition
AssigneeNgk Spark Plug Co., Ltd.
InventorsMasanori Takase, Hirofumi Ozeki
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AssigneeNgk Spark Plug Co., Ltd.
InventorsMasanori Takase, Hirofumi Ozeki
Estimating the term…
A dielectric ceramic composition which comprises a composition represented by xBaO.yNd.sub.2 O.sub.3.zTiO.sub.2 (where 8.5.ltoreq.x.ltoreq.20, 5.ltoreq.y.ltoreq.23, 62.ltoreq.z.ltoreq.85, and x+y+z=100), Y.sub.2 O.sub.3 in an amount not more than 15 wt % of the amount of said composition, and Al.sub.2 O.sub.3 in an amount not more than 2 wt % of the total amount of the principal components BaO, Nd.sub.2 O.sub.3, TiO.sub.2, and Y.sub.2 O.sub.3. And a relative permittivity .epsilon.r of the dielectric ceramic is not less than 59, its dielectric loss (tan .delta.) is 3.times.10.sup.-4 .about.8.times.10.sup.-4 (2.7 GHz), and its temperature coefficient of resonant frequency .tau.f may be -30.about.+10 ppm/.degree.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.
A microwave dielectric ceramic composition which comprises a composition represented by xBaO.yNd.sub.2 O.sub.3.zTiO.sub.2 (where 8.5<x<20 mol %, 5<y<23 mol %, 62<z<85 mol %, and x+y+z=100 mol %), Y.sub.2 O.sub.3 in an amount of 5 to 15 wt % of the amount of said composition, and Al.sub.2 O.sub.3 in an amount of 0.1 to 2 wt % of the total amount of the principal components BaO, Nd.sub.2 O.sub.3, TiO.sub.2, and Y.sub.2 O.sub.3.
A microwave dielectric ceramic composition which comprises a composition represented by xBaO.yNd.sub.2 O.sub.3.zTiO.sub.2 (where 8.5<x<20 mol %, 5<y<23 mol %, 62<z<85 mol %, and x+y+z=100 mol %), Y.sub.2 O.sub.3 in an amount of 5 to 9 wt % of the amount of said composition, and Al.sub.2 O.sub.3 in an amount of 0.1 to 0.5 wt % of the total amount of the principal components BaO, Nd.sub.2 O.sub.3, TiO.sub.2, and Y.sub.2 O.sub.3, and a relative permittivity .epsilon.r is not less than 59, a dielectric loss (tan .delta.) is 3.times.10.sup.-4 to about 8.times.10.sup.-4 (2.7 GHz), and a temperature coefficient of resonant frequency is .tau.f -30 to about +10 ppm/.degree.C.
Dependencies are inferred from the claim text.