Patent · US Expired

Microwave dielectric ceramic composition

US5188993A · kind A · utility

13Cited by
5References
15Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJan 22, 1992
Grant dateFeb 23, 1993
Priority date
Expiry dateJan 22, 2012

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH01B3/12
  • WIPO fieldElectrical machinery, apparatus, energy
  • WIPO sectorElectrical engineering

Abstract

A microwave dielectric ceramic composition which is obtained by selecting, in a composition formula of (A.sup.1+.sub.1/2 .multidot.B.sup.3+.sub.1/2) TiO.sub.3, Li.sup.1+ and Nd.sup.3+, Co.sup.3+ or Pr.sup.3+ as A.sup.1+ and B.sup.3+, respectively. The dielectric ceramic composition expressed by (A.sup.1+.sub.1/2 .multidot.B.sup.3+.sub.1/2) TiO.sub.3 has a high dielectric constant and has a temperature coefficient of resonance frequency .tau.f which is large on the minus side. MgO, CoO, ZnO, CaCO.sub.3 or SrCO.sub.3 is added to such a dielectric ceramic composition expressed by (A.sup.1+.sub.1/2 .multidot.B.sup.3+.sub.1/2 /TiO.sub.3, to improve the Q value of the dielectric ceramic composition.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.