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US 5,489,559 AGranted
Microwave dielectric ceramic composition
AssigneeNgk Spark Plug Co., Ltd.
InventorsHiroshi Katagiri, Hirofumi Ozeki
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AssigneeNgk Spark Plug Co., Ltd.
InventorsHiroshi Katagiri, Hirofumi Ozeki
Estimating the term…
The present invention provides a microwave dielectric ceramic composition in which .epsilon.r, Qu and .tau.f are generally controlled within a practical characteristic range and each of the characteristics is maintained in a well balanced state. A ceramic composition of the present invention comprises a composition represented by xBi.sub.2 O.sub.3 -(1-x) (yNb.sub.2 O.sub.5 -(1-y)Ta.sub.2 O.sub.5) in which 0.45.ltoreq.x.ltoreq.0.55 and 0.1.ltoreq.y<1.0 as a main ingredient, to which not more than 0.8 parts by weight of V.sub.2 O.sub.5 is added and incorporated. An another ceramic composition comprises a composition represented by Bi(NbxTa1-x)O.sub.4 in which 0<x.ltoreq.0.96 as a main ingredient, to which not more than 5 wt % of V.sub.2 O.sub.5 and not more than 2 wt % of PbO are added and incorporated. An another ceramic composition comprises the main ingredient as described above to which not more than 5 wt % of V.sub.2 O.sub.5 and not more than 2 wt % of MnO.sub.2 are added and incorporated. An another ceramic composition comprises the main ingredient as described above to which not more than 2 wt % of V.sub.2 O.sub.5 and not more than 1 wt % of TiO.sub.2 are added and incorporated. An another ceramic composition comprises the main ingredient as described above, to which not more than 2 wt % of V.sub.2 O.sub.5, not more than 2 wt % of MnO.sub.2 and not more than 0.7 wt % of TiO.sub.2 are added and incorporated. Instead of TiO.sub.2 described above, not more than 0.5 wt % (particularly not more than 0.4 wt %) of PbO can be added and incorporated.
A microwave dielectric ceramic composition comprising a composition represented by xBi.sub.2 O.sub.3 -(1-x) (yNb.sub.2 O.sub.5 -(1-y)Ta.sub.2 O.sub.5) in which 0.45.ltoreq.x.ltoreq.0.55 and 0<y<1.0 as a main ingredient, to which not more than 0.8 parts by weight (not including 0 part by weight) of V.sub.2 O.sub.5 is added and incorporated based on 100 parts by weight of xBi.sub.2 O.sub.3 -(1-x) (yNb.sub.2 O.sub.5 -(1-y)Ta.sub.2 O.sub.5).
A microwave dielectric ceramic composition comprising a composition represented by Bi(NbxTa1-x)O.sub.4 in which 0<x.ltoreq.0.96 as a main ingredient, to which not more than 5% by weight (not including 0% by weight) of V.sub.2 O.sub.5 and not more than 2% by weight (not including 0% by weight) of PbO are added and incorporated based on 100% by weight of Bi(NbxTa1-x)O.sub.4.
A microwave dielectric ceramic composition comprising a composition represented by Bi(NbxTa1-x)O.sub.4 in which 0<x.ltoreq.0.96 as a main ingredient, to which not more than 5% by weight (not including 0% by weight) of V.sub.2 O.sub.5 and not more than 2% by weight (not including 0% by weight) of MnO.sub.2 are added and incorporated based on 100% by weight of Bi(NbxTa1-x)O.sub.4.
A microwave dielectric ceramic composition comprising a composition represented by Bi(NbxTa1-x)O.sub.4 in which 0<x.ltoreq.0.96 as a main ingredient, to which not more than 2% by weight (not including 0% by weight) of V.sub.2 O.sub.5 and not more than 1% by weight (not including 0% by weight) of TiO.sub.2 are added and incorporated based on 100% by weight of Bi(NbxTa1-x)O.sub.4.
A microwave dielectric ceramic composition comprising a composition represented by Bi(NbxTa1-x)O.sub.4 in which 0<x.ltoreq.0.96 as a main ingredient, to which not more than 2% by weight (not including 0% by weight) of V.sub.2 O.sub.5 and not more than 2% by weight (not including 0% by weight) of MnO.sub.2, and not more than 0.7% by weight (not including 0% by weight) of TiO.sub.2 are added and incorporated based on 100% by weight of Bi(NbxTa1-x)O.sub.4.
A microwave dielectric ceramic composition comprising a composition represented by Bi(NbxTa1-x)O.sub.4 in which 0<x.ltoreq.0.96 as a main ingredient, to which 0.2 to 1% by weight of V.sub.2 O.sub.hd 5, not more than 1% by weight (not including 0% by weight) of MnO.sub.2 and not more than 0.5% by weight (not including 0% by weight) of PbO are added and incorporated based on 100% by weight of Bi(NbxTa1-x)O.sub.4.
Dependencies are inferred from the claim text.