Low temperature coefficient dielectric material comprising binary calcium niobate and calcium tantalate oxides
US5993947A · kind A · utility
3Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Nov 17, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24926
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Dielectric materials comprising Ca.sub.2 Ta.sub.2-x Nb.sub.x O.sub.7 have high dielectric constants (Ks) and relatively low temperature coefficients of dielectric constants (TCKs). Preferably, in this composition 0.20.ltoreq.x.ltoreq.1.20 and more preferably 0.32.ltoreq.x.ltoreq.0.40, and particularly preferred is the composite where x is 0.36. With a preferred embodiment where x is about 0.36, the dielectric constant is near 30 and the TCK is about 2 ppm/.degree.C., and the Q of the polycrystalline ceramic at 1 MHz is approximately 5000. The dielectric materials are particularly useful in microwave communications applications
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.