Microwave dielectric porcelain composition

Details Microwave dielectric porcelain composition Microwave dielectric porcelain composition

1998-11-06

1999-08-17

Group, Karl

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501135, C04B 35465

Patent

active

059393440

ABSTRACT:
The present invention provides a microwave dielectric porcelain composition having excellent properties, i.e., practically sufficient relative dielectric constant and unloaded Q value and a very small absolute temperature coefficient of resonant frequency. A novel microwave dielectric porcelain composition is provided, comprising a main component represented by the general formula (Ca.sub.x, Sr.sub.y, Nd.sub.z).sub.1+a proviso that x, y and z satisfy the following relationships: x+y+z=1, 0.780.ltoreq.x .ltoreq.0.900, 0.010.ltoreq.y.ltoreq.0.120, 0.090.ltoreq.z.ltoreq.0.130; a represents a number of from not less than 0.010 to not more than 0.300; and b represents a number of from not less than 0.100 to not more than 1.000!, A1.sub.2 O.sub.3, and at least one of oxides of elements other than Ca, Sr, Nd, Ti and Al, wherein the contents of Al.sub.2 O.sub.3 and said at least one of oxides of elements other than Ca, Sr, Nd, Ti and Al are from 10 to 12% by weight and from 1 to 2%, respectively, based on 100% by weight of the main component. The oxides are preferably Nb.sub.2 O.sub.3 and MnO.sub.2.

REFERENCES:
patent: 4438214 (1984-03-01), Masuyama et al.
patent: 5208727 (1993-05-01), Okamoto et al.
patent: 5320991 (1994-06-01), Takahashi et al.
patent: 5521130 (1996-05-01), Nakamura et al.
patent: 5840642 (1998-11-01), Kim et al.

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