Dielectric ceramic compositions
US5262370A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1992 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Apr 7, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/4686
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Ceramic composition comprising oxides of the elements Ba, Ti, Zn, and Me where Me is Nb or Nb and Ta, the mole ratios of the elements relative to Ba being: EQU 3.8.ltoreq.Ti.ltoreq.4.5 EQU 0.1.ltoreq.Zn.ltoreq.1.0 EQU 0.05.ltoreq.Me.ltoreq.0.3 and the composition containing at least one crystal structure of BaTi.sub.4 O.sub.9 and BaTi.sub.9 O.sub.20. The ceramic compositions have an excellent combination of electrical characteristics including Q value at the frequencies of interest for dielectric resonators, the dielectric constant and the T.sub.f value and are well adapted for use as electrical components in equipment operating at microwave frequencies such cellular communications equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.