Dielectric ceramic composition, multilayer resonator made of said composition and multilayer filter using said resonator
US5616528A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Nov 29, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/465
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A dielectric ceramic composition comprising main components represented by a composition formula on the weight basis, aMgO.multidot.bCaO.multidot.cTiO.sub.2, wherein a, b and c satisfy the following relationships, 25.ltoreq.a.ltoreq.35, 0.3.ltoreq.b.ltoreq.7, 60.ltoreq.c.ltoreq.70, a+b+c=100, blended with a boron-containing compound in an amount of from 3 to 20 parts by weight reckoned as B.sub.2 O.sub.3 and an alkali metal-containing compound in an amount of from 1 to 12 parts by weight reckoned as the alkali metal carbonate per 100 parts by weight of the main components, as well as a multilayer resonator made of said composition, and a filter using said resonator. The ceramic composition can be fired together with a conductor metal such as Ag or Cu at a relatively low temperature of 900.degree. to 1050.degree. C., exhibits large dielectric constant and Q-value, and a relatively small temperature coefficient .tau.f, lending itself well for use as a material for high-frequency electronic parts. The resonator made of this ceramic composition exhibits excellent tproperties in high-frequency regions, and can be realized in a small size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.